Walk Through of CERR Capabilities. CERR: Introduction. Outline. Getting CERR: Control Panel. Documentation Support Community
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1 Walk Through of CERR Capabilities Aditya P. Apte, Ph.D. Department of Medical Physics Memorial Sloan Kettering Cancer Center New York AAPM 2015, July 15, 2015 CERR: Computational Environment for Radiological Research CERR (pronounced 'sir') provides a platform to prototype algorithms for Radiotherapy and Radiomics. i (e.g. IMRT, Outcomes research, Image features etc) Open source, free: GNU GPL copyleft Developers: James Alaly, Aditya Apte, Divya Khullar, Yu Wu and Joseph O. Deasy 1 2 CERR: Introduction Written in Matlab. Source and Compiled versions are available Import and display treatment plans from a wide variety of commercial or academic treatment planning systems. Provides a common filetype for Research E.g: creation of multi institutional treatment plan databases for various types of research studies, including dose volume outcomes analyses,imrt treatment planning comparisons and Radiomics. 3 Documentation Support Community Wiki: Forum: forum p//g p g g /g p/ Download: (GitHub) Citations 261 Web of Science, 379 Google Scholar (June 2015) 4 Outline Dose Distributions Images Structures DVHs CERR data structure s IMRTP Research Radiotherapy outcomes modeling Radiomics Advanced visualization and analysis tools 5 Getting CERR: Control Panel Source version: Add all the sub-folders to Matlab path Compiled version: Install Matlab runtime libraries 6 1
2 : Help 7 8 3D visualization Courtesy: Rachael Hachadorian 9 10 Dose Management Colorbar / Isodose
3 Dose / CT Profile Right-click options Dose Projection Image Registration via command line:wrapper around Plastimatch Image Registration / QA Before Registration After Registration [baseplanc, movplanc] = register_scans(baseplanc, movplanc, basescannum, movscannum, algorithm) Image Registration / QA Mirror Checkerboard CheckerBoard Mirror Scope Image Mirror
4 Contouring Contouring on Fused Images Contouring Region of Interest Deriving new structures Structure Transformation Examples Dose volume Histograms dividestructureantpost(structnum) dividestructureantpostleftright(structnum)
5 Dose volume Histograms Dose volume Histograms Fractional Absolute Default Settings: CERROptions.m Sinc upsampling PET SUVs Plastimatch command file Sagittal/Coronal display of Structures Transverse slice Sinc-upsampled slice of a PET scan at at resolution of original resolution 512x512 of 128x128 CERR Data structure All DICOM objects are stored under a global planc variable. planc: CellArray containing a particular type of DICOM object. For example: 3 rd element (planc{3}) contains scan metadata Last element of planc (planc{end})contains mapping of these DICOM objects CERR Data structure Scripting Examples Scan coordinates Unit Testing runcerrtests Dose within Structure
6 Import of Image data Radiomics Pipeline ROI Aggregation Analysis Shape 1 Radiomics features supported Eccentricity, Circularity, Solidity, Extent, Euler Number Texture 1 Homogeneity, Entropy, Contrast, Coherence Zone Size 3 Homogeneity, Entropy, Contrast, t Coherence Stats 4 Kurtosis, Slope, Skewness, Min/Max/Median/ MTV Metabolic Tumor Volume is the volume with SUV above a set threshold El Naqa et al, Pattern Recognition, 2009; 42(6) Haralick et al, IEEE Transactions on Systems, Man, and Cybernetics, 1973; SMC-3(6): Yu-Hua Dean Fang et al., BioMed Research International, vol. 2014, Article ID , Philippe Lambin, Hugo J.W.L. Aerts et al, European Journal of Cancer, Volume 48, Issue 4, March 2012, Pages Planner s Tx Plan Prototyping an IMRTP algorithm Eclipse CERR 3 rd Party IMRTP GUI Extract Beam parameters Create beamlets Calculate Influence of each beamlet at each voxel Optimize Beamlet weights Output the beamlet weights (fluence) to Eclipse readable files Generate volumetric dose in Eclipse reading the fluence profiles IMRTP Influence Matrix Get influence matrix with QIB or VMC++ dose calculation algorithms Getting the volumetric Dose: (Influence) (beamlet weights)
7 Optimize Beamlet weights and write to Eclipse readable fluence Eclipse vs PriOpt Plans courtesy: Paras Tiwari Implemented by user Beamlet Optimizer Provided by CERR PBweights_to_fluence Toy Example IMRTP solver runoptimexample.m ation_example?w=cerrwiki i i Treatmement data CERR Extractor Makes it easy to batch-extract and combine Dosimetric & Clinical data (ETL process) Outcomes and Clinical data CERR Extractor STEP 1: Choose directory containing Tx plans STEP 2: Choose structures to model STEP 3: Manually correct unconventional names STEP 4: COHORT REVIEW STEP 5: Choose Excel file containing outcomes / clinical data STEP 6: Export Tx, outcomes and clinical information to DREES STEP 7: Model Cohort Viewer
8 Advanced tools Dose Location Histogram (DLH) Advanced tools Plan Robustness Analysis DLH gives an idea about the location of cold / hot spots within a structure relative to its surface. Eg: 85cc of cold spots (Dose <= 70Gy) lie within 1.4 cm from the surface Advanced tools Generating Consensus Contour Advanced tools Fast 3D Gamma Metric Graph of Agreement volume v/s Confidence level for the three methods: Apparent, kappacorrected and STAPLE. User can interactively select the confidence level by dragging the red line and consensus regions will be updated accordingly. This process would change the estimated volume to match desired confidence level. Based on "A fast algorithm for gamma evaluation in 3D, Wendling et al, Medical physics, 34 (5), pp. 1647, Works with doses of unequal dimensions and having associated transformations. Computation time for regular doses is ~2 seconds. 1 0 Warfield, Zou, and Wells Thank you 47 8
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