2016 AAPM Annual Meeting
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Session Title: Session in Memory of Robert J. Shalek: High Resolution Dosimetry from 2D to 3D to Real-time 3D
Question 1: Cherenkov light is produced from:
Reference:Glaser AK, Zhang R, Andreozzi JM, Gladstone DJ, Pogue BW. “Cherenkov radiation fluence estimates in tissue for molecular imaging and therapy applications.” Phys Med Biol. 2015 Sep 7;60(17):6701-18.
Choice A:Low velocity protons.
Choice B:Electrons traveling with velocity greater than the speed of light in the medium.
Choice C:All of the above.
Question 2: Although Cherenkov light appears blue when seen by eye, the light detected out of tissue is red and near-infrared because of:
Reference:Axelsson J, Glaser AK, Gladstone DJ, Pogue BW. “Quantitative Cherenkov emission spectroscopy for tissue oxygenation assessment.” Opt Express. 2012 Feb 27;20(5):5133-42
Choice A:Absorption due to blood.
Choice B:Scattering attenuation.
Choice C:Absorption due to water.
Choice D:Absorption and re-emission as fluorescence.
Question 3: The relationship between Cherenkov intensity and dose is most linear when:
Reference:Glaser AK, Zhang R, Andreozzi JM, Gladstone DJ, Pogue BW. “Cherenkov radiation fluence estimates in tissue for molecular imaging and therapy applications.” Phys Med Biol. 2015 Sep 7;60(17):6701-18.
Choice A:The beam energy and position in the tissue does not change.
Choice B:When imaging in water.
Choice C:When the beam is diameter is largest.
Choice D:All of the above.
Question 4: Radiochromic 3D dosimeters can be read-out in high resolution and 3D using which imaging modality?
Reference:Oldham M, “Methods and Techniques for Comprehensive 3D dosimetry”, Advances in Medical Physics: 2014, Editors Devon J. Godfrey, Shiva K. Das and Anthony B. Wolbarst, ISBN: 9781930524729, Published: 2014 July | 289 pp
Choice A:X-ray CT.
Choice B:Optical-CT.
Choice C:Magnetic resonance imaging.
Choice D:Ultrasound.
Question 5: The advantages of Optical-CT 3D dosimetry scanners that utilize a matched pair of telecentric lenses include:
Reference:Andrew Thomas1, Joseph Newton1, John Adamovics2 and Mark Oldham, Commissioning and benchmarking a 3D dosimetry system for clinical use, Med. Phys. 38, 4846 (2011)
Choice A:Improved spatial resolution.
Choice B:Rigorous scatter and stray-light rejection.
Choice C:Greater depth of field.
Choice D:B and C.
Question 6: Storage phosphor dosimeters function using the mechanism of ____
Reference:[Reference: H. Li*, J.P. Driewer, Z. Han, D.A. Low, D. Yang, Z. Xiao. “Two-dimensional reusable, high spatial-resolution dosimeter using europium doped potassium chloride: a feasibility study.” Phys. Med. Biol. 59 1899–1909 2014]
Choice A:Thermoluminescence.
Choice B:Photostimulated luminescence.
Choice C:X-ray luminescence.
Choice D:P-N junction.
Question 7: KCl:Eu2+ (europium doped potassium chloride) storage phosphor dosimeter has a luminescence lifetime of ____ , which enables fast 2D high resolution scanning.
Reference:[Reference: J.P. Driewer, H. Chen, A. Osvet, D.A. Low, H. Li. “Radiation hardness of the storage phosphor europium doped potassium chloride for radiation therapy dosimetry.” Med. Phys. 38(8) 4681-4688 2011]
Choice A:1 µs
Choice B:1 ms
Choice C:10 ms
Choice D:100 ms
Question 8: Volumetric scintillation detectors are capable of measuring following proton beam characteristics:
Reference:Beddar S 2015 Real-time volumetric scintillation dosimetry D8th International Conference on 3D Radiation Dosimetry (IC3DDose) Journal of Physics: Conference Series 573 012005
Choice A:Range.
Choice B:Position.
Choice C:Intensity.
Choice D:All of the above.
Question 9: The spatial resolution of a volumetric scintillation detector is dictated by:
Reference:Beddar S, Archambault L, Sahoo N, Poenisch F, Chen G T, Gillin M T and Mohan R 2009 Exploration of the potential of liquid scintillators for real-time 3D dosimetry of intensity modulated proton beams Medical Physics 36 1736
Choice A:Pixel size of the sCMOS sensor.
Choice B:Binning factor.
Choice C:The point spread function of the lens.
Choice D:All of the above.
Question 10: The most dominant optical artefact is:
Reference:Robertson D, Hui C, Archambault L, Mohan R and Beddar S 2014 Optical artefact characterization and correction in volumetric scintillation dosimetry Physics in Medicine and Biology 59 23–42
Choice A:Blurring of the scintillation light signal.
Choice B:Decreased brightness at image periphery.
Choice C:Radial change in pixel size and location.
Choice D:Hot pixels and streaks on sensor chip.
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