3D printing technologies

Transcription

1 AFTERNOON SESSION / 5 / 3:30 4:00 / 9 Sep, 2016 method for secondary James Jung Department of Radiation Oncology, University of Florida <Non melanoma skin cancer> Courtesy of ForUsDocs/consultant360 webpage Basal cell carcinoma Squamous cell carcinoma Ortho voltage/electron therapy with skin cancer Some of skin cancers: ortho voltage RT (250 kvp X rays) 1 1

2 How dose it work? Primary collimation (shaped by jaws inside gantry head) Secondary skin collimation (SSC) Courtesy of radoncreview 2 Limitation of current fabrication method time consuming it takes 1 week to prepare the SSC labor intensive quite tough extreme discomfort for patient Inaccuracy due to the hand made Time consuming, labor intensive, uncomfortable, inaccurate Therapist making lead layers collimator(ssc) 3 2

3 Other efforts Boyd et al. (2003) custom wax bolus with SSC Courtesy of Boyd_ASTRO 2003 Milling machined SSC with vendor (online) 2 3D scanning and 3D printing Purpose To develop a new SSC fabrication method using 3D scanning and 4 3

4 1. Procedure Simple way to make it! Scanning Patient skin contour Modeling mold for cerrobend pouring 2. Validation Contour fitness (CT image) Thickness accuracy (CT image) Shielding effect (film dosimetry) Printing mold Pouring cerrobend Scanning.obj 3D scanner (Structure Sensor) w/ ipad I m a 2nd author! Catch a color/depth and delineation of tumor lesion It takes 1 min. 6 4

5 Modeling (with a graphic 3D modeler).stl - Rhinoceros (McNeel, Seattle, WA) or Cinema4D (Maxon, Newbury Park, CA) Import file Crop / Extruder Thickness determine Making the exposure area using a various functions (extruder, boole) It takes 15 min Printing.Gcode 3D printing (Lulzbot TAZ 4, Aleph Objects, Loveland, CO) FDM / ABS, PLA / 29.8 x 27.5 x 25 cm 3 / 200 mm/s Type Material Build volume Printing speed Pour the cerrobend into the hollow 8 5

6 2.1. Dosimetry Ortho voltage (250 kvp / Filter 2, 3) Interaction between PLA and cerrobend Penetration and homogeneity of the fabricated patch 9 1. Comparison between our proposed method and conventional method Cost Speed (Ready to use) Accuracy Easy to modify Conventional $$$ 1 week + No New Method $ 1 hour +++ Yes 2. SSC made by 3D printer (< 1 h) 10 6

7 3. Verification of SSC with CT scan 4. Dose profile from film dosimetry Our proposed method is One day ready to use! 2. SSC thickness: top / hollow / bottom 1 mm thickness 1 mm vs. 2 mm Expand in 1 mm 3. In scanning process, it needs only around 180, but pay attention to the missing surface due to shading effects 12 7

8 4. 3D printing filament: ABS, PLA, etc. 5. Cerrobend distribution in the patch (SSC) 6. Our proposed method could be adapted to the other cases (knee, ankle, etc.) in radiotherapy 13 A new method for the SSC fabrication An alternative way to replace conventional manual based methods for electron and/or ortho voltage SSC fabrication 14 8

9 Team work at UF Gainesville Therapists Dosimetrists Physicists Physicians Engineers Students 15 Thank you ANY QUESTION? 16 9