2016 AAPM Annual Meeting
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Session Title: Joint AAPM-ESTRO Symposium: Advances in Experimental Medical Physics
Question 1: What is the source of acoustic signal in proton beam therapy?
Reference:Parodi and Assmann, Ionoacoustics: A new direct method for range verification, Modern Physics Letters A Vol. 30, No. 17 (2015) 1540025
Choice A:Thermal expansion of tissue, following illumination with the laser light used for patient positioning.
Choice B:Thermal expansion of tissue, following the energy deposition of the proton beam, which is enhanced at the Bragg peak and for pulsed beam delivery.
Choice C:Oscillations of the tissue, in resonance with the pulsed beam delivery.
Choice D:No acoustic signal can be produced in proton beam therapy.
Question 2: 1. The most important mechanism in producing a significant proportion of low-energy photons in a low-Z target beam line is:
Reference:Reference: Galbraith, Med Phys. 1989 Sep-Oct;16(5):734-46.
Choice A:Electron-electron bremsstrahlung.
Choice B:Use of thinner targets, reducing total attenuation.
Choice C:Reduced absorption of the low-E population due to a lower cross-section for photon interaction.
Choice D:Reduced absorption by removing the flattening filter.
Question 3: Experimental low-Z target beam lines have contained up to the following percentage of photons in the diagnostic range:
Reference:Reference: Parsons and Robar, Med Phys. 2015 Sep;42(9):5258-69.
Choice A:10%
Choice B:22%
Choice C:43%
Choice D:54%
Question 4: Magnetic resonance imaging possesses the following properties, except:
Reference:Kunjuchan et al Chem Rev 2015 ; 115(19):10907-37
Choice A:High spatial resolution.
Choice B:High soft tissue contrast.
Choice C:High versatility.
Choice D:High contrast agent sensitivity.
Question 5: Transmission line theory is relevant when:
Reference:Reference: Ragan, George L. (1965) Microwave Transmission Circuits. New York, NY: Dover.
Choice A:The signal wavelength is much larger than the physical circuit dimensions
Choice B:The signal wavelength is of comparable size or smaller than the physical circuit dimensions.
Choice C:PCB trace widths are > 5 mm.
Choice D:Transmission line theory is always relevant.
Question 6: Which application is envisioned by acoustic signal detection in proton beam therapy?
Reference:Parodi and Assmann, Ionoacoustics: A new direct method for range verification, Modern Physics Letters A Vol. 30, No. 17 (2015) 1540025
Choice A:Reconstruction of the body temperature for combined hyperthermal treatment.
Choice B:Reconstruction of the biological effect of the radiation.
Choice C:Verification of the proton beam range in-vivo and quasi in real-time.
Choice D:Detection of the tissue acoustic properties for enhanced ultrasound image guidance.
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