Shadow casting. What is the problem? Cone Beam Computed Tomography THE OBJECTIVES OF DIAGNOSTIC IMAGING IDEAL DIAGNOSTIC IMAGING STUDY LIMITATIONS
|
|
- Natalie Murphy
- 5 years ago
- Views:
Transcription
1 Cone Beam Computed Tomography THE OBJECTIVES OF DIAGNOSTIC IMAGING Reveal pathology Reveal the anatomic truth Steven R. Singer, DDS IDEAL DIAGNOSTIC IMAGING STUDY Provides desired diagnostic yield Low risk to the patient Minimal cost Convenient to dentist and patient LIMITATIONS Inherent properties of x-rays Projectional nature of conventional imaging Misrepresentation What is the problem? Shadow casting 1
2 Distortion in panoramic radiographs Superimposition of overlying structures Inaccurate measurements Inaccurate anatomical relationships Inability to visualize the Z axis Plenty! Intra-oral radiography Panoramic radiography COMPUTED TOMOGRAPHY 2
3 Advantages of CT Basic principle of CT The internal structure of an object can be reconstructed from multiple projections of the object Elimination of superimposition of structures Improved contrast resolution 1% difference in physical density differences v 10% difference in conventional films Multiplanar reformatted image This means that data can be viewed in either coronal, axial, or sagital planes History Sir Godfrey Hounsfield Announced by Godfrey Hounsfield in 1972 Initially called Computerized Axial Transverse Scanning Used a narrowly collimated, moving x-ray beam with a scintillation crystal detector. Resultant analog image was digitized and reconstructed by computer algorithm Able to detect soft tissue differences with greater sensitivity than conventional images Stereopticon Stereopticon 3
4 Buccal Object Rule The EMI Brain Scanner Early CT Images Basics Computerized Tomography, or CT is the preferred current terminology. Don t call it a CAT scan! The Z axis Image data Hounsfield Unit - specific to each pixel is the average of all density measurements for that pixel Scan Field of View: Area within the gantry from which raw data is acquired. Small: 25cm - head Medium : 35 cm- chest Large : cm- abdomen 4
5 Image data. Radiation dose distribution The display field of view and the matrix determine the pixel size.the entire scan circle or a portion of the circle may be selected to display on the monitor. Pixel Size = Field of view / Matrix size Density The displayed image is an array of pixels. The displayed density is proportional to the attenuation characteristics of that voxel Each pixel is assigned a CT number. The CT number is also known as Hounsfield Units, in honor of Sir Godfrey Hounsfield. The scale ranges from (air) to 0 (water) to (dense bone) Hounsfield Units Getting the right image Because we cannot see the difference between 2000 different shades of grey it would be pointless to produce an image which covered the whole range of Hounsfield numbers. In order to produce a useful image of the area of interest a system of windowing and levels is used. Windowing The available grey scale is spread over the chosen range of Hounsfield numbers. The window defines the upper and lower limits of this range. To produce an image which shows up most major structures a large window is used. For more detailed information about tissues with very similar density a small window is used. The smaller the window the more detailed the image but the range of tissue density that is seen is reduced Levels The level is the Hounsfield number at the centre of the window. This is chosen so that the window covers the type of tissue you are interested in. To image dense tissues a high level is used and to image low density tissues a low level is used. Hounsfield Units Hounsfield Units 5
6 Hounsfield Units Window width and window levels This image was produced with a window of 1000HU at level -700HU This image was produced with a window of 500HU at level +50HU and width/level and width/level Decreasing the Window Width increases the contrast in the image so it is good for looking at differences in soft tissues e.g. brain tissue HU Increasing the Window Width allows structures with a large pixel range (i.e. bones and lungs) to be viewed HU Decreasing the Window Level allows the lungs and airways to be viewed. Increasing the Window Level allows the denser bones to be viewed. DUAL WINDOW SETTINGS OR DOUBLE WINDOW SETTING Window width Window width HU HU Windowing: Residual cyst with squamous cell carcinoma Soft Tissue Window Bone Window Basics The basic approach is that of a x-ray tube emitting a thin, fan-shaped beam in the direction of an array of detectors. These are either scintillation detectors or ionization chambers. Different arrangements call for simultaneous movement of the source and detectors, or the source only may revolve around the patient to acquire the images. 6
7 Current Generation Scanners 3 rd Generation 4 th Generation Rotate-rotate Rotate only Basics Third generation scanners are called Incremental Scanners, since the final image set contains a series of contiguous or overlapping images The current generation of scanners provides a helical or spiral scan. The patient is moved through the gantry as the images are exposed. This creates a continuous spiral of data. Adapted From White & Pharoah 5 th edition Terminology Continuous acquisition scanning Spiral scanning -Siemens Helical scanning-ge Adapted From White & Pharoah 5 th edition Basics Basics Benefits of spiral scanning including: Decreased acquisition time (12 seconds v 5 minutes) Improved multiplanar reconstructions Decreased dose to patient The CT image is a computer reconstruction of multiple images A scan consists of a 360 degree rotation around the patient. There may be projections at each 1/3 degree of rotation. This will give a total of 1080 projections. The image is displayed in a series of voxels (volume elements) 7
8 Basics The flat image is displayed as 0.1 mm squares called pixels (picture elements) The depth of each voxel is determined by the collimation of the beam, both at the tube head and the detector array. The voxel depth is analogous to the image layer (or focal trough) in a panoramic radiograph MEDICAL CT VS CONE-BEAM CT Medical CT Medical CT Cone-beam CT Cone-beam CT Cone-shaped x-ray beam 8
9 Cone beam CT Cone beam CT Cone shaped beam One flat panel sensor Advantages/disadvantages over Medical CT Less radiation Lower cost Fixed imaging volume Limited to head and neck I-CAT (Imaging Sciences) Cone Beam CT Cone Beam CT 9
10 Cone Beam CT Cone Beam CT Cone Beam CT MULTI-PLANAR REFORMATTING Planes Multi-planar reformatting Axial image/slice 10
11 Multi-planar reformatting Multi-planar reformatting Coronal (frontal) image/slice Sagittal image/slice Axial imaging Axial imaging Axial imaging 11
12 Axial imaging Axial imaging Axial imaging Axial imaging Coronal (frontal) imaging Coronal (frontal) imaging 12
13 Coronal (frontal) imaging Coronal (frontal) imaging CBCT applications Impactions Pre-implant assessment Impactions TMJ hard tissue assessment Oral cancer F/U Trauma Other Impactions Impactions 13
14 Impactions 3D applications Orthodontic applications Facial asymmetry Orthodontic applications Facial asymmetry Courtesy Dr D. Hatcher Courtesy Dr D. Hatcher Orthodontic applications Facial asymmetry Orthodontic applications Facial asymmetry Courtesy Dr D. Hatcher Courtesy Dr D. Hatcher 14
15 TMJ evaluation TMJ evaluation Courtesy Dr D. Hatcher TMJ evaluation Trauma Courtesy Dr D. Hatcher Trauma Trauma 15
16 Trauma Pre-implant assessment Computed tomography (+) (-) No shadows of surrounding structures Variable slice thickness and multiplanar imaging Evaluation of bone height, width and bone quality High contrast resolution Best imaging of the vital structures Streaking artifacts Higher radiation to the patient Not readily available No magnification Is cross-sectional imaging necessary? Clinical observation and palpation have been proven to be inadequate for the estimation of the width of the ridge (Beeman 1989) Presence of undercuts, especially in completely edentulous patients Anatomical structures of interest, especially the mandibular canal do show better (Stella and Tharanon 1990) Bone density estimation (with CT) 16
17 Radiographic guides Identify the proposed implant sites: RADIOGRAPHIC TEMPLATES Radiographic guides Radiographic guides Hollowed out guides Radiographic guides Radiographic guides Markers (metal or gutta-percha) Clear acrylic templates 17
18 Radiographic guides Radiographic guides Radiographic guides Radiographic guides Radiographic guides 18
19 Radiographic guides Radiographic guides Remove gutta-percha markers Immediately after completion of surgery 19
20 1 week after surgery Alveolar ridge variation Alveolar ridge variation Alveolar ridge variation Alveolar ridge variation Mental foramen 20
21 Mental foramen Mental foramen Lingual foramen Accessory lingual foramina Bisphosphonate ONJ 21
22 Bisphosphonate ONJ Bisphosphonate ONJ Radiation exposure INTERPRETATION Extraction of meaningful information, explanation. Webster s dictionary 22
23 Case 4 Thank you! 23
24 Thanks to: Christos Angelopoulos DDS, MS Division of Oral & Maxillofacial Imaging Columbia University College of Dental Medicine For the use of slides and images 24
Fundamentals of CT imaging
SECTION 1 Fundamentals of CT imaging I History In the early 1970s Sir Godfrey Hounsfield s research produced the first clinically useful CT scans. Original scanners took approximately 6 minutes to perform
More informationCT Basics Principles of Spiral CT Dose. Always Thinking Ahead.
1 CT Basics Principles of Spiral CT Dose 2 Who invented CT? 1963 - Alan Cormack developed a mathematical method of reconstructing images from x-ray projections Sir Godfrey Hounsfield worked for the Central
More informationCh. 4 Physical Principles of CT
Ch. 4 Physical Principles of CT CLRS 408: Intro to CT Department of Radiation Sciences Review: Why CT? Solution for radiography/tomography limitations Superimposition of structures Distinguishing between
More informationSpiral CT. Protocol Optimization & Quality Assurance. Ge Wang, Ph.D. Department of Radiology University of Iowa Iowa City, Iowa 52242, USA
Spiral CT Protocol Optimization & Quality Assurance Ge Wang, Ph.D. Department of Radiology University of Iowa Iowa City, Iowa 52242, USA Spiral CT Protocol Optimization & Quality Assurance Protocol optimization
More informationRadiology. Marta Anguiano Millán. Departamento de Física Atómica, Molecular y Nuclear Facultad de Ciencias. Universidad de Granada
Departamento de Física Atómica, Molecular y Nuclear Facultad de Ciencias. Universidad de Granada Overview Introduction Overview Introduction Tecniques of imaging in Overview Introduction Tecniques of imaging
More informationCorso di laurea in Fisica A.A Fisica Medica 4 TC
Corso di laurea in Fisica A.A. 2007-2008 Fisica Medica 4 TC Computed Tomography Principles 1. Projection measurement 2. Scanner systems 3. Scanning modes Basic Tomographic Principle The internal structure
More informationComputer-Tomography I: Principles, History, Technology
Computer-Tomography I: Principles, History, Technology Prof. Dr. U. Oelfke DKFZ Heidelberg Department of Medical Physics (E040) Im Neuenheimer Feld 280 69120 Heidelberg, Germany u.oelfke@dkfz.de History
More informationMEDICAL IMAGING 2nd Part Computed Tomography
MEDICAL IMAGING 2nd Part Computed Tomography Introduction 2 In the last 30 years X-ray Computed Tomography development produced a great change in the role of diagnostic imaging in medicine. In convetional
More informationicatvision Quick Reference
icatvision Quick Reference Navigating the i-cat Interface This guide shows how to: View reconstructed images Use main features and tools to optimize an image. REMINDER Images are displayed as if you are
More informationImage Acquisition Systems
Image Acquisition Systems Goals and Terminology Conventional Radiography Axial Tomography Computer Axial Tomography (CAT) Magnetic Resonance Imaging (MRI) PET, SPECT Ultrasound Microscopy Imaging ITCS
More informationBME I5000: Biomedical Imaging
1 Lucas Parra, CCNY BME I5000: Biomedical Imaging Lecture 4 Computed Tomography Lucas C. Parra, parra@ccny.cuny.edu some slides inspired by lecture notes of Andreas H. Hilscher at Columbia University.
More informationMedical Image Processing: Image Reconstruction and 3D Renderings
Medical Image Processing: Image Reconstruction and 3D Renderings 김보형 서울대학교컴퓨터공학부 Computer Graphics and Image Processing Lab. 2011. 3. 23 1 Computer Graphics & Image Processing Computer Graphics : Create,
More informationProfound understanding of anatomy
ENGLISH Profound understanding of anatomy The unique Planmeca ProMax 3D product family offers equipment for all maxillofacial imaging. All volume sizes from the smallest special cases to whole head images
More informationComputer-Tomography II: Image reconstruction and applications
Computer-Tomography II: Image reconstruction and applications Prof. Dr. U. Oelfke DKFZ Heidelberg Department of Medical Physics (E040) Im Neuenheimer Feld 280 69120 Heidelberg, Germany u.oelfke@dkfz.de
More information3/27/2012 WHY SPECT / CT? SPECT / CT Basic Principles. Advantages of SPECT. Advantages of CT. Dr John C. Dickson, Principal Physicist UCLH
3/27/212 Advantages of SPECT SPECT / CT Basic Principles Dr John C. Dickson, Principal Physicist UCLH Institute of Nuclear Medicine, University College London Hospitals and University College London john.dickson@uclh.nhs.uk
More informationTomographic Reconstruction
Tomographic Reconstruction 3D Image Processing Torsten Möller Reading Gonzales + Woods, Chapter 5.11 2 Overview Physics History Reconstruction basic idea Radon transform Fourier-Slice theorem (Parallel-beam)
More informationRADIOLOGY AND DIAGNOSTIC IMAGING
Day 2 part 2 RADIOLOGY AND DIAGNOSTIC IMAGING Dr hab. Zbigniew Serafin, MD, PhD serafin@cm.umk.pl 2 3 4 5 CT technique CT technique 6 CT system Kanal K: RSNA/AAPM web module: CT Systems & CT Image Quality
More informationMEDICAL EQUIPMENT: COMPUTED TOMOGRAPHY. Prof. Yasser Mostafa Kadah
MEDICAL EQUIPMENT: COMPUTED TOMOGRAPHY Prof. Yasser Mostafa Kadah www.k-space.org Recommended Textbook X-Ray Computed Tomography in Biomedical Engineering, by Robert Cierniak, Springer, 211 Computed Tomography
More informationOne Machine... Mac OS Compatible! Multiple Modalities. ProMax 3D & 3D s
One Machine... Multiple Modalities Mac OS Compatible! 3D Bitewing Panoramic Cephalometric Features Availability of multiple imaging modalities in one machine (3D, bitewing, panoramic, and cephalometric)
More informationA closer look at CT scanning
Vet Times The website for the veterinary profession https://www.vettimes.co.uk A closer look at CT scanning Author : Charissa Lee, Natalie Webster Categories : General, Vets Date : April 3, 2017 A basic
More informationPhysical bases of X-ray diagnostics
Physical bases of X-ray diagnostics Dr. István Voszka Possibilities of X-ray production (X-ray is produced, when charged particles of high velocity are stopped) X-ray tube: Relatively low accelerating
More informationIntroduction to Biomedical Imaging
Alejandro Frangi, PhD Computational Imaging Lab Department of Information & Communication Technology Pompeu Fabra University www.cilab.upf.edu X-ray Projection Imaging Computed Tomography Digital X-ray
More informationPLANMECA PROMAX 3D MID CBCT UNIT
1(5) PLANMECA PROMAX 3D MID CBCT UNIT Introduction The Planmeca ProMax 3D Mid X-ray unit uses cone beam computerized tomography (CBCT) to produce three-dimensional X-ray images. Panoramic and cephalometric
More informationCLASS HOURS: 4 CREDIT HOURS: 4 LABORATORY HOURS: 0
Revised 10/10 COURSE SYLLABUS TM 220 COMPUTED TOMOGRAPHY PHYSICS CLASS HOURS: 4 CREDIT HOURS: 4 LABORATORY HOURS: 0 CATALOG COURSE DESCRIPTION: This course is one of a three course set in whole body Computed
More informationOptimization of CT Simulation Imaging. Ingrid Reiser Dept. of Radiology The University of Chicago
Optimization of CT Simulation Imaging Ingrid Reiser Dept. of Radiology The University of Chicago Optimization of CT imaging Goal: Achieve image quality that allows to perform the task at hand (diagnostic
More informationC a t p h a n / T h e P h a n t o m L a b o r a t o r y
C a t p h a n 5 0 0 / 6 0 0 T h e P h a n t o m L a b o r a t o r y C a t p h a n 5 0 0 / 6 0 0 Internationally recognized for measuring the maximum obtainable performance of axial, spiral and multi-slice
More informationImPACT. Information Leaflet No. 1: CT Scanner Acceptance Testing
ImPACT Information Leaflet No. 1: CT Scanner Acceptance Testing Version 1.02, 18/05/01 CONTENTS: 1. SCOPE OF LEAFLET 2. GENERAL PRINCIPLES OF ACCEPTANCE AND COMMISSIONING 2.1 PHANTOMS 2.2 EXPOSURE AND
More information[PDR03] RECOMMENDED CT-SCAN PROTOCOLS
SURGICAL & PROSTHETIC DESIGN [PDR03] RECOMMENDED CT-SCAN PROTOCOLS WORK-INSTRUCTIONS DOCUMENT (CUSTOMER) RECOMMENDED CT-SCAN PROTOCOLS [PDR03_V1]: LIVE 1 PRESCRIBING SURGEONS Patient-specific implants,
More informationSome reference material
Some reference material Physics reference book on medical imaging: A good one is The Essential Physics of Medical Imaging, 3 rd Ed. by Bushberg et al. ($170! new). However, there are several similar books
More informationDiagnostic imaging techniques. Krasznai Zoltán. University of Debrecen Medical and Health Science Centre Department of Biophysics and Cell Biology
Diagnostic imaging techniques Krasznai Zoltán University of Debrecen Medical and Health Science Centre Department of Biophysics and Cell Biology 1. Computer tomography (CT) 2. Gamma camera 3. Single Photon
More informationDolphin 3D Imaging 11.7 beta
Dolphin 3D Imaging 11.7 beta The Dolphin 3D software module is a powerful tool that makes processing 3D data extremely simple, enabling dental specialists from a wide variety of disciplines to diagnose,
More informationMEDICAL IMAGING 2nd Part Computed Tomography
MEDICAL IMAGING 2nd Part Computed Tomography Introduction 2 In the last 30 years X-ray Computed Tomography development produced a great change in the role of diagnostic imaging in medicine. In convetional
More informationThe 3D Accuitomo 80 offers a minute voxel. size of just 80 μm (micrometer). This super-fine. voxel combined with the unit s 13 bit grayscale
2 Thinking ahead. Focused on life. REALIZED: Groundbreaking Resolution of 80 µm Voxel 05 The Crystallization of cutting-edge mechatronics and High Definition display algorithm The 3D Accuitomo 80 offers
More informationComputed tomography - outline
Computed tomography - outline Computed Tomography Systems Jørgen Arendt Jensen and Mikael Jensen (DTU Nutech) October 6, 216 Center for Fast Ultrasound Imaging, Build 349 Department of Electrical Engineering
More informationCarestream s 2 nd Generation Metal Artifact Reduction Software (CMAR 2)
Carestream s 2 nd Generation Metal Artifact Reduction Software (CMAR 2) Author: Levon Vogelsang Introduction Cone beam computed tomography (CBCT), or cone beam CT technology, offers considerable promise
More information1970 Projection Radiography 2D projection of 3D anatomy
Speakers: L. N. Rothenberg, Ph.D. Computed Tomography G. D. Clarke, Ph.D. Magnetic Resonance Imaging J. A. Zagzebski, Ph.D. Ultrasonic Imaging August 1, 2012 Lawrence N. Rothenberg, Ph.D. Keith S. Pentlow,
More informationPURE. ViSION Edition PET/CT. Patient Comfort Put First.
PURE ViSION Edition PET/CT Patient Comfort Put First. 2 System features that put patient comfort and safety first. Oncology patients deserve the highest levels of safety and comfort during scans. Our Celesteion
More informationMicro-CT Methodology Hasan Alsaid, PhD
Micro-CT Methodology Hasan Alsaid, PhD Preclinical & Translational Imaging LAS, PTS, GlaxoSmithKline 20 April 2015 Provide basic understanding of technical aspects of the micro-ct Statement: All procedures
More informationFirst CT Scanner. How it Works. Contemporary CT. Before and After CT. Computer Tomography: How It Works. Medical Imaging and Pattern Recognition
Computer Tomography: How t Works Medical maging and Pattern Recognition Lecture 7 Computed Tomography Oleh Tretiak Only one plane is illuminated. Source-subject motion provides added information. 2 How
More informationComputed Tomography. Principles, Design, Artifacts, and Recent Advances. Jiang Hsieh THIRD EDITION. SPIE PRESS Bellingham, Washington USA
Computed Tomography Principles, Design, Artifacts, and Recent Advances THIRD EDITION Jiang Hsieh SPIE PRESS Bellingham, Washington USA Table of Contents Preface Nomenclature and Abbreviations xi xv 1 Introduction
More informationDigital Image Processing
Digital Image Processing SPECIAL TOPICS CT IMAGES Hamid R. Rabiee Fall 2015 What is an image? 2 Are images only about visual concepts? We ve already seen that there are other kinds of image. In this lecture
More informationCT: Physics Principles & Equipment Design
CT: Physics Principles & Equipment Design James Kofler, Ph.D Radiology Mayo Clinic Rochester, MN June 27, 2012 Disclosures Nothing to disclose Learning Objectives Understand fundamental concepts of - CT
More informationTEP Hounsfield units. Related topics Attenuation coefficient, Hounsfield units
Hounsfield units TEP Related topics Attenuation coefficient, Hounsfield units Principle Depending on the type of CT scanner and the settings, the result of a CT scan of the same material can be different
More informationScatter Correction for Dual source Cone beam CT Using the Pre patient Grid. Yingxuan Chen. Graduate Program in Medical Physics Duke University
Scatter Correction for Dual source Cone beam CT Using the Pre patient Grid by Yingxuan Chen Graduate Program in Medical Physics Duke University Date: Approved: Lei Ren, Supervisor Fang Fang Yin, Chair
More informationicatvision Software Manual
University of Minnesota School of Dentistry icatvision Software Manual April 19, 2013 Mansur Ahmad, BDS, PhD Associate Professor, University of Minnesota School of Dentistry Director, American Board of
More informationINTRODUCTION TO MEDICAL IMAGING- 3D LOCALIZATION LAB MANUAL 1. Modifications for P551 Fall 2013 Medical Physics Laboratory
INTRODUCTION TO MEDICAL IMAGING- 3D LOCALIZATION LAB MANUAL 1 Modifications for P551 Fall 2013 Medical Physics Laboratory Introduction Following the introductory lab 0, this lab exercise the student through
More informationOptimisation of Toshiba Aquilion ONE Volume Imaging
Optimisation of Toshiba Aquilion ONE Volume Imaging Jane Edwards, RPRSG Royal Free London NHS Foundation Trust Dr Mufudzi Maviki, Plymouth Hospitals NHS Trust Background In 2011/12 Radiology at RFH was
More informationPlanmeca ProMax 3D Max CBCT unit
D00107623 1(6) Planmeca ProMax 3D Max CBCT unit Introduction The Planmeca ProMax 3D Max X-ray unit uses cone beam computerized tomography (CBCT) to produce threedimensional X-ray images. Panoramic and
More informationDesign and performance characteristics of a Cone Beam CT system for Leksell Gamma Knife Icon
Design and performance characteristics of a Cone Beam CT system for Leksell Gamma Knife Icon WHITE PAPER Introduction Introducing an image guidance system based on Cone Beam CT (CBCT) and a mask immobilization
More informationDUE to beam polychromacity in CT and the energy dependence
1 Empirical Water Precorrection for Cone-Beam Computed Tomography Katia Sourbelle, Marc Kachelrieß, Member, IEEE, and Willi A. Kalender Abstract We propose an algorithm to correct for the cupping artifact
More informationINTERNATIONAL STANDARD
INTERNATIONAL STANDARD IEC 60601-2-44 2001 AMENDMENT 1 2002-09 Amendment 1 Medical electrical equipment Part 2-44: Particular requirements for the safety of X-ray equipment for computed tomography Amendement
More informationAIDR 3D Iterative Reconstruction:
Iterative Reconstruction: Integrated, Automated and Adaptive Dose Reduction Erin Angel, PhD Manager, Clinical Sciences, CT Canon Medical Systems USA Iterative Reconstruction 1 Since the introduction of
More informationComputed Tomography. Principles of Medical Imaging. Contents. Prof. Dr. Philippe Cattin. MIAC, University of Basel. Sep 26th/Oct 3rd, 2016
Computed Tomography Principles of Medical Imaging Prof. Dr. Philippe Cattin MIAC, University of Basel Contents Abstract 1 Computed Tomography Basics Introduction Computed Tomography Hounsfield's CT Prototype
More information8/7/2017. Disclosures. MECT Systems Overview and Quantitative Opportunities. Overview. Computed Tomography (CT) CT Numbers. Polyenergetic Acquisition
Quantitative Multi-Energy Computed Tomography: Imaging and Therapy Advancements Disclosures MECT Systems Overview and Quantitative Opportunities The speaker receives research funding from GE Healthcare
More informationMoscow-Bavarian Joint Advanced Student School 2006 / Medical Imaging Principles of Computerized Tomographic Imaging and Cone-Beam Reconstruction
Line Integrals Line integrals represent the integral of some parameter of the object along the line (e.g. attenuation of x-rays) Object: f(x,y) Line: x cosθ + y sinθ = t Line integral / Radon transform:
More informationBiomedical Imaging. Computed Tomography. Patrícia Figueiredo IST
Biomedical Imaging Computed Tomography Patrícia Figueiredo IST 2013-2014 Overview Basic principles X ray attenuation projection Slice selection and line projections Projection reconstruction Instrumentation
More informationComputational Medical Imaging Analysis
Computational Medical Imaging Analysis Chapter 2: Image Acquisition Systems Jun Zhang Laboratory for Computational Medical Imaging & Data Analysis Department of Computer Science University of Kentucky
More informationVisualisation : Lecture 1. So what is visualisation? Visualisation
So what is visualisation? UG4 / M.Sc. Course 2006 toby.breckon@ed.ac.uk Computer Vision Lab. Institute for Perception, Action & Behaviour Introducing 1 Application of interactive 3D computer graphics to
More informationEmpirical cupping correction: A first-order raw data precorrection for cone-beam computed tomography
Empirical cupping correction: A first-order raw data precorrection for cone-beam computed tomography Marc Kachelrieß, a Katia Sourbelle, and Willi A. Kalender Institute of Medical Physics, University of
More informationEffect of Scattering on the Image. Reducing Compton Scatter with a Grid
Effect of Scattering on the Image Increasing Compton scattering degrades image. Webb 21 Reducing Compton Scatter with a Grid Grids Parallel (focused at infinity) Linear Focused (see figure) Moving grids
More informationSuperior Imaging on the Go
Superior Imaging on the Go About Samsung Samsung Electronics Co., Ltd. is a global leader in technology, opening new possibilities for people everywhere. Through relentless innovation and discovery, we
More informationApplying Hounsfield unit density calibration in SkyScan CT-analyser
1 Bruker-microCT Method note Applying Hounsfield unit density calibration in SkyScan CT-analyser Hounsfield units (HU) are a standard unit of x-ray CT density, in which air and water are ascribed values
More informationMedical Imaging Projects
NSF REU MedIX Summer 2006 Medical Imaging Projects Daniela Stan Raicu, PhD http://facweb.cs.depaul.edu/research draicu@cs.depaul.edu Outline Medical Informatics Imaging Modalities Computed Tomography Medical
More informationAutomated Image Analysis Software for Quality Assurance of a Radiotherapy CT Simulator
Automated Image Analysis Software for Quality Assurance of a Radiotherapy CT Simulator Andrew J Reilly Imaging Physicist Oncology Physics Edinburgh Cancer Centre Western General Hospital EDINBURGH EH4
More informationFinancial disclosure. Onboard imaging modality for IGRT
Tetrahedron Beam Computed Tomography Based On Multi-Pixel X- Ray Source and Its Application in Image Guided Radiotherapy Tiezhi Zhang, Ph.D. Advanced X-ray imaging Lab Financial disclosure Patent royalty
More informationBrilliance CT Big Bore.
1 2 2 There are two methods of RCCT acquisition in widespread clinical use: cine axial and helical. In RCCT with cine axial acquisition, repeat CT images are taken each couch position while recording respiration.
More informationLAB DEMONSTRATION COMPUTED TOMOGRAPHY USING DESKCAT Lab Manual: 0
LAB DEMONSTRATION COMPUTED TOMOGRAPHY USING DESKCAT Lab Manual: 0 Introduction This lab demonstration explores the physics and technology of Computed Tomography (CT) and guides the student and instructor
More informationTomoTherapy Related Projects. An image guidance alternative on Tomo Low dose MVCT reconstruction Patient Quality Assurance using Sinogram
TomoTherapy Related Projects An image guidance alternative on Tomo Low dose MVCT reconstruction Patient Quality Assurance using Sinogram Development of A Novel Image Guidance Alternative for Patient Localization
More informationComputational Medical Imaging Analysis Chapter 4: Image Visualization
Computational Medical Imaging Analysis Chapter 4: Image Visualization Jun Zhang Laboratory for Computational Medical Imaging & Data Analysis Department of Computer Science University of Kentucky Lexington,
More informationModifications for P551 Fall 2014
LAB DEMONSTRATION COMPUTED TOMOGRAPHY USING DESKCAT 1 Modifications for P551 Fall 2014 Introduction This lab demonstration explores the physics and technology of Computed Tomography (CT) and guides the
More informationEnhancement Image Quality of CT Using Single Slice Spiral Technique
Enhancement Image Quality of CT Using Single Slice Spiral Technique Doaa. N. Al Sheack 1 and Dr.Mohammed H. Ali Al Hayani 2 1 2 Electronic and Communications Engineering Department College of Engineering,
More informationPlanmeca ProMax 3D s CBCT unit
D0010759 1(5) Planmeca ProMax 3D s CBCT unit Introduction The Planmeca ProMax 3D s X-ray unit uses cone beam computerized tomography (CBCT) to produce threedimensional X-ray images. Panoramic and cephalometric
More informationPhilips SPECT/CT Systems
Philips SPECT/CT Systems Ling Shao, PhD Director, Imaging Physics & System Analysis Nuclear Medicine, Philips Healthcare June 14, 2008 *Presented SNM08 Categorical Seminar - Quantitative SPECT and PET
More informationImplementation and evaluation of a fully 3D OS-MLEM reconstruction algorithm accounting for the PSF of the PET imaging system
Implementation and evaluation of a fully 3D OS-MLEM reconstruction algorithm accounting for the PSF of the PET imaging system 3 rd October 2008 11 th Topical Seminar on Innovative Particle and Radiation
More informationAn Acquisition Geometry-Independent Calibration Tool for Industrial Computed Tomography
4th International Symposium on NDT in Aerospace 2012 - Tu.3.A.3 An Acquisition Geometry-Independent Calibration Tool for Industrial Computed Tomography Jonathan HESS *, Patrick KUEHNLEIN *, Steven OECKL
More informationX-ray Tomography. A superficial introduction, but sufficient enough to get us started in surgical navigation.
X-ray Tomography A superficial introduction, but sufficient enough to get us started in surgical navigation. X-ray absorption in homogeneous tissue I o I o / I d m = density I I=I o e -kdm k= constant
More informationExperience Boundless Performance
Experience Boundless Performance About Samsung Samsung Electronics Co., Ltd. inspires the world and shapes the future with transformative ideas and technologies, redefining the worlds of TVs, smartphones,
More informationCT NOISE POWER SPECTRUM FOR FILTERED BACKPROJECTION AND ITERATIVE RECONSTRUCTION
CT NOISE POWER SPECTRUM FOR FILTERED BACKPROJECTION AND ITERATIVE RECONSTRUCTION Frank Dong, PhD, DABR Diagnostic Physicist, Imaging Institute Cleveland Clinic Foundation and Associate Professor of Radiology
More informationA new Concept for High-Speed atline and inlinect for up to 100% Mass Production Process Control
18th World Conference on Nondestructive Testing, 16-20 April 2012, Durban, South Africa A new Concept for High-Speed atline and inlinect for up to 100% Mass Production Process Control Oliver BRUNKE 1,
More informationJoint ICTP-TWAS Workshop on Portable X-ray Analytical Instruments for Cultural Heritage. 29 April - 3 May, 2013
2455-5 Joint ICTP-TWAS Workshop on Portable X-ray Analytical Instruments for Cultural Heritage 29 April - 3 May, 2013 Lecture NoteBasic principles of X-ray Computed Tomography Diego Dreossi Elettra, Trieste
More informationLecture 6: Medical imaging and image-guided interventions
ME 328: Medical Robotics Winter 2019 Lecture 6: Medical imaging and image-guided interventions Allison Okamura Stanford University Updates Assignment 3 Due this Thursday, Jan. 31 Note that this assignment
More informationMulti-slice CT Image Reconstruction Jiang Hsieh, Ph.D.
Multi-slice CT Image Reconstruction Jiang Hsieh, Ph.D. Applied Science Laboratory, GE Healthcare Technologies 1 Image Generation Reconstruction of images from projections. textbook reconstruction advanced
More informationANALYSIS OF CT AND PET/SPECT IMAGES FOR DOSIMETRY CALCULATION
2009 International Nuclear Atlantic Conference - INAC 2009 Rio de Janeiro,RJ, Brazil, September27 to October 2, 2009 ASSOCIAÇÃO BRASILEIRA DE ENERGIA NUCLEAR - ABEN ISBN: 978-85-99141-03-8 ANALYSIS OF
More informationLimitations of Projection Radiography. Stereoscopic Breast Imaging. Limitations of Projection Radiography. 3-D Breast Imaging Methods
Stereoscopic Breast Imaging Andrew D. A. Maidment, Ph.D. Chief, Physics Section Department of Radiology University of Pennsylvania Limitations of Projection Radiography Mammography is a projection imaging
More informationComputed tomography (Item No.: P )
Computed tomography (Item No.: P2550100) Curricular Relevance Area of Expertise: Biology Education Level: University Topic: Modern Imaging Methods Subtopic: X-ray Imaging Experiment: Computed tomography
More informationMedical Imaging BMEN Spring 2016
Name Medical Imaging BMEN 420-501 Spring 2016 Homework #4 and Nuclear Medicine Notes All questions are from the introductory Powerpoint (based on Chapter 7) and text Medical Imaging Signals and Systems,
More information4/19/2016. Deborah Thames R.T. (R)(M)(QM) Theory & Technology and advancement in 3D imaging DBT
Deborah Thames R.T. (R)(M)(QM) Theory & Technology and advancement in 3D imaging DBT 1 Three manufacturers approved for Tomo Hologic and GE, and Siemens Why 2D Digital Mammography 2D FFDM it appears to
More informationComparison of Scatter Correction Methods for CBCT. Author(s): Suri, Roland E.; Virshup, Gary; Kaissl, Wolfgang; Zurkirchen, Luis
Research Collection Working Paper Comparison of Scatter Correction Methods for CBCT Author(s): Suri, Roland E.; Virshup, Gary; Kaissl, Wolfgang; Zurkirchen, Luis Publication Date: 2010 Permanent Link:
More informationEquipment Specification
MULTISLICE CT SCANNER ( 16 Slices ) Merk : Hitachi Japan Model : SUPRIA 5 MHU Price : Rp 6.512.360.215,27 No Equipment Specification 1 2 3 Scanner Gantry Object for scanning : Whole body including head
More informationDUAL energy X-ray radiography [1] can be used to separate
IEEE TRANSACTIONS ON NUCLEAR SCIENCE, VOL. 53, NO. 1, FEBRUARY 2006 133 A Scatter Correction Using Thickness Iteration in Dual-Energy Radiography S. K. Ahn, G. Cho, and H. Jeon Abstract In dual-energy
More informationSimulation of Mammograms & Tomosynthesis imaging with Cone Beam Breast CT images
Simulation of Mammograms & Tomosynthesis imaging with Cone Beam Breast CT images Tao Han, Chris C. Shaw, Lingyun Chen, Chao-jen Lai, Xinming Liu, Tianpeng Wang Digital Imaging Research Laboratory (DIRL),
More informationFits you like no other
Fits you like no other BrightView X and XCT specifications The new BrightView X system is a fully featured variableangle camera that is field-upgradeable to BrightView XCT without any increase in room
More informationPatient Set-ups and Tumor Localizations
Patient Set-ups and Tumor Localizations Amy S. Harrison Patient Positioning Prior to starting any localization or simulation procedure patients need to be positioned and immobilized Patients disease location
More informationReduction of Metal Artifacts in Computed Tomographies for the Planning and Simulation of Radiation Therapy
Reduction of Metal Artifacts in Computed Tomographies for the Planning and Simulation of Radiation Therapy T. Rohlfing a, D. Zerfowski b, J. Beier a, P. Wust a, N. Hosten a, R. Felix a a Department of
More informationVJ Technologies Inspection Services Division. By Bob Maziuk, February 2015
White Paper on the Inspection of Underground Electrical Conductors, Insulation, and Splices in Oil-Filled Piping Using High Energy Computed Tomography (CT) VJ Technologies Inspection Services Division
More informationDigital Laminography and Computed Tomography with 600 kv for Aerospace Applications
4th International Symposium on NDT in Aerospace 2012 - Tu.3.A.1 Digital Laminography and Computed Tomography with 600 kv for Aerospace Applications Malte KURFISS 1, Gerd STRECKENBACH 2 1 YXLON International
More informationImage Quality Assessment and Quality Assurance of Advanced Imaging Systems for IGRT. AAPM Penn-Ohio Chapter Sep 25, 2015 Soyoung Lee, PhD
Image Quality Assessment and Quality Assurance of Advanced Imaging Systems for IGRT AAPM Penn-Ohio Chapter Sep 25, 2015 Soyoung Lee, PhD 1 Outline q Introduction q Imaging performances in 4D-CBCT Image
More informationEvaluation report. X-ray tomographic image guided radiotherapy systems CEP10071
Evaluation report X-ray tomographic image guided radiotherapy systems CEP10071 March 2010 Contents 2 Summary... 3 Introduction... 6 Product description... 9 Methods... 14 Technical performance... 23 Purchasing...
More informationAcknowledgments and financial disclosure
AAPM 2012 Annual Meeting Digital breast tomosynthesis: basic understanding of physics principles James T. Dobbins III, Ph.D., FAAPM Director, Medical Physics Graduate Program Ravin Advanced Imaging Laboratories
More informationCT vs. VolumeScope: image quality and dose comparison
CT vs. VolumeScope: image quality and dose comparison V.N. Vasiliev *a, A.F. Gamaliy **b, M.Yu. Zaytsev b, K.V. Zaytseva ***b a Russian Sci. Center of Roentgenology & Radiology, 86, Profsoyuznaya, Moscow,
More information