2016 AAPM Annual Meeting
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Session Title: Image Guidance Technologies and Management Strategies
Question 1: During prostate cancer treatment of obese men without IGRT could lead to positioning errors of.....
Reference:James R. Wong, Zhanrong Gao, et al. “Potential for higher treatment failure in obese patients: correlation of elevated body mass index and increased daily prostate deviations from the radiation beam isocenters in an analysis of 1,465 computed tomographic images”, IJROBP 75(1); 49-55 (2009) Millender LE, Aubin M. et. al. “Daily electronic portal imaging for morbidly obese men undergoing radiotherapy for localized prostate cancer”, IJROBP 59; 6-10 (2004)
Choice A:Greatest in L/R and can be >10mm.
Choice B:Greatest in A/P and can be >10mm.
Choice C:Greatest in I/S and can be >7mm.
Choice D:Equal in all three dimensions and can be >10mm.
Question 2: Intra- fraction and inter-fraction motion of DIBH and free breathing liver motions were observed to be up to:
Reference:Dawson, LA, Brock,KK et. al. “The reproducibility of organ position using active breathing control (ABC) during liver radiotherapy”, IJROBP 51; 1410-21 (2001) Eccles, C, Brock, KK et. al., “Reproducibility of liver position using active breathing coordinator for liver cancer radiotherapy”, IJROBP 64; 751-59 (2006)
Choice A:4.4mm; 2.5 mm; 10mm.
Choice B:2.5 mm; 4.4mm; 40mm.
Choice C:2.5 mm; 2.5mm; 20mm.
Choice D:4.4 mm; 4.4mm; 10mm.
Question 3: During the treatment of spine metastases, the translational and rotational components of clinically observed set-up errors increased D5 _cord by an average of:
Reference:Guckenberger, M, Meyer, J, et al. “ Radiotherapy and Oncology 84; 56-63 (2007)
Choice A:8±4%, and 8±4%
Choice B:10±5%, and 5±3%
Choice C:23±14%, and 3±2%
Choice D:3±2%, and 23±14%
Question 4: What is the primary difference between 2D-2D registration and 2D-3D registration when using the stereotactic x-ray for IGRT?
Reference:G. Li, T. J. Yang, H. Furtado, W. Birkfellner, A. Ballangrud, S. N. Powell, and J. Mechalakos, "Clinical Assessment of 2D/3D Registration Accuracy in 4 Major Anatomic Sites Using On-Board 2D Kilovoltage Images for 6D Patient Setup," Technol Cancer Res Treat 14, 305-314 (2015).
Choice A:2D-3D registration can provide 6 degrees of freedom corrections.
Choice B:2D-3D registration is faster as it can take the full advantage of GPU (graphic processing unit).
Choice C:2D-2D registration can visualize the bony anatomy better so it should be used for SRS.
Choice D:They are equally good.
Question 5: Which of the following is NOT true about CBCT?
Reference:L. Chen, C. C. Shaw, C.-j. Lai, M. C. Altunbas, T. Wang, S.-j. Tu, and X. Liu, "Comparison of full-scan and half-scan for cone beam breast CT imaging," Proc. SPIE 6142, 61424M-61427 (2006).
Choice A:3D-3D comparison for image guidance.
Choice B:Real-time image acquisition due to the fast reconstruction using FFT.
Choice C:Image quality is inferior to diagnostic CT due to scattering.
Choice D:Does not always need 360-degree gantry rotation for image acquisition.
Question 6: Which of the following CAN NOT be setup using an infrared system?
Reference:S. L. Meeks, F. J. Bova, T. H. Wagner, J. M. Buatti, W. A. Friedman, and K. D. Foote, "Image localization for frameless stereotactic radiotherapy," International Journal of Radiation Oncology Biology Physics 46, 1291-1299 (2000).
Choice A:Brain SRS with bite block.
Choice B:Brain SBRT with open mask.
Choice C:Breast.
Choice D:Prostate with implanted infrared markers.
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