2016 AAPM Annual Meeting
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Session Title: PANEL DISCUSSION: SBRT/SRS Case Studies - Lung
Question 1: The greatest source of uncertainty in the radiotherapy of lung tumors arises from:
Reference:Senan et al., Defining target volumes for non-small cell lung carcinoma, Seminars in Radiation Oncology, 14(4):308-314, 2004.
Choice A:Patient motion.
Choice B:Patient setup.
Choice C:Tumor delineation.
Choice D:Tumor motion.
Choice E:Tumor tracking.
Question 2: The magnitude of respiratory motion below which active respiratory motion management during radiotherapy may prove to be ineffective is:
Reference:Ref: Keall et al., The management of respiratory motion in radiation oncology report of AAPM Task Group 76, Med Phys 33(10): 3874-900
Choice A:1 cm
Choice B:3 cm
Choice C:0.3 cm
Choice D:2 cm
Choice E:0.5 cm
Question 3: Which if these methods can be used to determine ITV?
Reference:Keall et al., The management of respiratory motion in radiation oncology report of AAPM Task Group 76, Med Phys 33(10): 3874-900
Choice A:“Slow” CT.
Choice B:Breath hold CT.
Choice C:Respiration triggered CT.
Choice D:4D/Respiration correlated CT.
Choice E:Volumetric CT.
Choice F:All of the above.
Question 4: What is Lung SBRT?
Reference:AAPM TG101
Choice A:A single fraction treatment.
Choice B:A treatment with “n” fractions (n is your choice).
Choice C:Any treatment on a machine claiming “stereotactic” capability.
Choice D:Any treatment that uses a stereotactic frame.
Question 5: Maximum intensity projections (MIP) may be problematic in all of the following ways, except:
Reference:Comparison of helical, maximum intensity projection (MIP), and averaged intensity (AI) 4D CT imaging for stereotactic body radiation therapy (SBRT) planning in lung cancer, Jeffrey D. Bradley, , Ahmed N. Nofal, Issam M. El Naqa,Wei Lu,Jubei Liu, James Hubenschmidt,Daniel A. Low,Robert E. Drzymala, Divya Khullar, Radiotherapy and Oncology, 81(3): 264-268, Dec 2006
Choice A:Where background and tumor have similar Hounsfield units.
Choice B:When MIP used for planning, the isodose coverage may be overestimated.
Choice C:MIPs may underestimate normal tissue volumes (i.e. lung).
Choice D:MIPs are most helpful near the diaphragm.
Question 6: What statement is correct when performing pre-Tx patient specific QA?
Reference:Comparison of helical, maximum intensity projection (MIP), and averaged intensity (AI) 4D CT imaging for stereotactic body radiation therapy (SBRT) planning in lung cancer, Jeffrey D. Bradley, , Ahmed N. Nofal, Issam M. El Naqa,Wei Lu,Jubei Liu, James Hubenschmidt,Daniel A. Low,Robert E. Drzymala, Divya Khullar, Radiotherapy and Oncology, 81(3): 264-268, Dec 2006
Choice A:The very plan that is prepared for patient delivery at record and verify should be used for QA.
Choice B:All gantry angles, couch angles should be used in QA.
Choice C:Absolute dose should be measured.
Choice D:Verify a distribution of points planar/3D.
Choice E:All of the above.
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