2016 AAPM Annual Meeting
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Session Title: Radiation Dose Monitoring and Protocol Management
Question 1: For isocentric fluoroscopic systems, the interventional reference point is located along the central x-ray beam at a distance of.....
Reference:: Stecker M. et al, Guidelines for Patient Radiation Dose Management, J Vasc Interv Radiol 2009; 20:S263–S273
Choice A:30 cm from the x-ray detector.
Choice B:15 cm from the x-ray detector.
Choice C:15 cm from the isocenter in the direction of the focal spot
Choice D:30 cm from the isocenter in the direction of the focal spot
Question 2: The patient follow-up dose threshold recommended by SIR is:
Reference:Stecker M. et al, Guidelines for Patient Radiation Dose Management, J Vasc Interv Radiol 2009; 20:S263–S273
Choice A:2000 mGy Peak Skin Dose.
Choice B:5000 mGy Air kerma at the reference point.
Choice C:90 minutes of fluoroscopy time.
Choice D:600 Gy cm2 Kerma-area-product.
Question 3: Patient dose history should affect justification of future exams utilizing ionizing radiation in the following ways if LNT hypothesis is accepted:
Reference:Walsh C, Murphy D. Should the justification of medical exposures take account of radiation risks from previous examinations? BJR. 2014;87:20130682
Choice A:Not at all. Two radiation events are independent and hypothetical past risks should not be weighted in the justification of future exams.
Choice B:Strongly. Increasing the total number of exams adds to the patients cumulative exposure and increases Lifetime Attributable Risk (LAR)
Choice C:Moderately. Although cumulative exposure increases with more exams, the diagnostic benefit typically outweighs these hypothetical risks.
Choice D:On a patient-by-patient basis depending on underlying pathology.
Question 4: Diagnostic Reference Ranges should be established based on
Reference:Goske MJ, Strauss KJ, Coombs LP, et al. Diagnostic Reference Ranges for Pediatric Abdominal CT. Radiology. 2013.
Choice A:National survey data from many different institution categories (adult, pediatric, academic.
Choice B:National survey data from relevant practice type (e.g. pediatric).
Choice C:25th and 75th percentile values of the ACR Dose Index Registry.
Choice D:Achievable levels within host institution in consideration of technology, patient demographics and clinical indication.
Question 5: What information is needed and commonly available from the Radiation Dose Structured Report (RDSR) for reviewing CT dose distributions for a protocol?
Reference:The DICOM Standard 2016a, http://dicom.nema.org/standard.html
Choice A:Tube Starting Angle.
Choice B:Irradiation Event UID.
Choice C:CTDIw Phantom Type, DLP, and CTDIvol.
Choice D:Top Z Location of Scanning Length.
Question 6: Which system is used by the ACR Dose Index Registry to standardize imaging procedure names?
Reference:The ACR DIR website, http://www.acr.org/Quality-Safety/National-Radiology-Data-Registry/Dose-Index-Registry/Data-Transmission-and-Compatible-Vendors
Choice A:Individual institutions own set of examination types
Choice B:SNOMED
Choice C:DICOM Standard CT Procedure Names
Choice D:RadLex Playbook and ACR Common
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