2016 AAPM Annual Meeting
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Session Title: DBT Physics Basic to Advanced
Question 1: How does the radiation dose of tomosynthesis compare to mammography?
Reference:H. Machida, T Yuhara, et al. Radiation Dose of Digital Tomosynthesis for Sinonasal Examination: Comparison with Multi-Detector CT, Eur J Radiol 81, 1140-1145, 2012
Choice A:Slightly less than mammography.
Choice B:Equal to mammography.
Choice C:Slightly more than mammography.
Question 2: CT and tomosynthesis images are acquired as a series of projections. How does a projection image sample the Fourier domain of an object
Reference:J. Zhang, C. Yu, A Novel Solid-Angle Tomosynthesis (SAT) Scanning Scheme, Medical Physics, 37(8), 2010
Choice A:A line in the Fourier domain.
Choice B:A plane in the Fourier domain.
Choice C:A double-napped cone.
Choice D:It fully samples the Fourier domain.
Question 3: How does spatial resolution of tomosynthesis compare to CT?
Reference:Acciavatti RJ, Maidment ADA. Observation of Super-Resolution in Digital Breast Tomosynthesis. Med Phys. 2012;39(12):7518-39.
Choice A:Poorer x, y, and z resolution.
Choice B:Poorer x & y resolution; better z resolution.
Choice C:Better x, y, and z resolution.
Choice D:Better x & y resolution; poorer z resolution.
Choice E:Same x, y, and z resolution.
Question 4: The radiation dose in tomosynthesis is determinedly primarily by which factor?
Reference:T. Olgar, T Kahn, and D. Gosch, Average Glandular Dose in Digital Mammography and Breast Tomosynthesis, Rofo, 2012
Choice A:Body part thickness.
Choice B:Angular range.
Choice C:Number of projections.
Choice D:Number of reconstructed images.
Choice E:Angular range AND number of projections.
Question 5: What is the dependence of out-of-plane artifacts in tomosynthesis with increasing angular range?
Reference:Sechopoulos, C. Ghetti. Optimization of the acquisition geometry in digital tomosynthesis of the breast. Med. Phys. 36(4), 1199-1207, 2009.
Choice A:Independent of angular range.
Choice B:Increases with increasing angular range.
Choice C:Decreases with increasing angular range.
Question 6: When imaging a large circular disk, how does in-plane image contrast depend on angular range?
Reference:Sechopoulos, C. Ghetti. Optimization of the acquisition geometry in digital tomosynthesis of the breast. Med. Phys. 36(4), 1199-1207, 2009.
Choice A:Independent of angular range.
Choice B:Increases with increasing angular range.
Choice C:Decreases with increasing angular range.
Question 7: In breast x-ray imaging, what dose are we primarily concerned with?
Reference:Wu, X., Barnes, G. T., & Tucker, D. M. (1991). Spectral dependence of glandular tissue dose in screen-film mammography. Radiology, 179(1), 143-148.
Choice A:Absorbed dose to the whole breast.
Choice B:Effective dose to the whole body.
Choice C:Absorbed dose to the glandular tissue.
Choice D:Equivalent dose from x-ray scatter.
Question 8: What is the federal dose limit to a patient for a breast screening exam?
Reference:Jerrold T. Bushberg, J. Anthony Seibert, Edwin M. Leidholdt Jr., John M. Boone. "The Essential Physics of Medical Imaging" Third Edition.
Choice A:50 mSv per screening exam.
Choice B:3 mGy per view.
Choice C:1 mGy per view.
Choice D:There is no limit of dose to a patient.
Question 9: What is the impact on breast dose of acquiring a breast tomosynthesis image in addition to a mammogram?
Reference:Feng, S. S. J., & Sechopoulos, I. (2012). Clinical digital breast tomosynthesis system: dosimetric characterization. Radiology, 263(1), 35-42.
Choice A:No additional dose to the breast.
Choice B:An increase of dose of about 100%.
Choice C:An increase of dose of about 50%.
Choice D:An increase of dose of about 10%.
Question 10: What is the impact on breast dose of replacing the mammogram with a synthetic image created from the breast tomosynthesis image?
Reference:Feng, S. S. J., & Sechopoulos, I. (2012). Clinical digital breast tomosynthesis system: dosimetric characterization. Radiology, 263(1), 35-42
Choice A:There is no reduction in dose to the breast.
Choice B:The synthetic image requires a higher tomosynthesis dose.
Choice C:The synthetic image reduces the total dose by about half.
Choice D:The dose savings is minimal, given how much higher the tomosynthesis dose is compared to the mammo dose.
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