2022 AAPM 64th Annual Meeting
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Session Title: CT Protocol Optimization for the Real World
Question 1: Which of the following lists of indications is in order from lowest dose to highest dose?
Reference:ACR dose index data example report data accessible here (accessed 3/24/2022) https://nrdrsupport.acr.org/support/solutions/articles/11000044558-dir-available-reports?_ga=2.149343349.236218917.1648143265-1450770596.1648143265
Choice A:Virtual colonoscopy, surgical planning CTA, lumbar spine, renal stone follow up
Choice B:Virtual colonoscopy, renal stone follow up, surgical planning CTA, lumbar spine
Choice C:Lumbar spine, surgical planning CTA, renal stone follow up, virtual colonoscopy
Choice D:Surgical planning CTA, lumbar spine, renal stone follow up, virtual colonoscopy
Question 2: Evaluation of which organ requires the highest radiation dose for oncologic staging in the abdomen?
Reference:Low contrast liver lesion detection and characterization is one of the most challenging tasks in oncologic imaging of the abdomen (source Dr. Jensen’s lecture).
Choice A:Kidney
Choice B:Spleen
Choice C:Adrenal Gland
Choice D:Liver
Question 3: Which of the following positions would provide the best image quality for an elbow scan?
Reference:Chapter 10 “Patient Positioning” from “The CT Handbook: optimizing protocols for today’s feature-rich scanners”
Choice A:Elbow at patient’s side (lateral to torso, touching torso)
Choice B:Elbow over patient’s abdomen (patient is supine, elbow resting on abdomen)
Choice C:Elbow over patient’s abdomen resting on a pillow (patient is supine, elbow resting away from abdomen on top of a pillow)
Choice D:Elbow at patient’s side near edge of gantry (lateral to torso, away from torso touching gantry housing)
Question 4: The delay between start of contrast injection and scanning for a faster scanner relative to a slower scanner should be
Reference:Chapter 8 “CT Contrast” from “The CT Handbook: optimizing protocols for today’s feature-rich scanners”
Choice A:Longer for the faster scanner
Choice B:Shorter for the faster scanner
Choice C:The same scan delays should be used unless scan speeds are over 600 mm/s
Choice D:The delay doesn’t need to be adjusted for scan speed
Question 5: For a typical adult patient, in an ideal situation, what is the needle gauge and access point for the optimal administration of contrast?
Reference:https://www.acr.org/-/media/ACR/Files/Clinical-Resources/Contrast_Media.pdf ACR Contrast Manual
Choice A:20-gauge needle in the right femoral artery
Choice B:22-gauge in the back of the hand
Choice C:18-gauge in the antecubital vein
Choice D:18-gauge in the foot
Question 6: How can a site save money by using a weight-based contrast prescription?
Reference:Davenport MS, Parikh KR, Mayo-SmithWW, et al. Effect of fixed-volume and weight-based dosing regimens on the cost and volume of administered iodinated contrast material at abdominal CT. J Am Coll Radiol. 2017; 14:359–370.
Choice A:They would need to buy more contrast and therefore receive volume pricing
Choice B:They would buy higher concentration contrast (i.e., less volume) and therefore buy less volume
Choice C:They can reduce contrast volumes for smaller patients
Choice D:They can reduce contrast volumes for larger patients
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