CTDIvol - The Helical Revolution?
E Olguin1*, D Gress2*, T Aufdemberge3*, (1) Brookline, MA, (2) American College of Radiology, Reston, VA, (3) Medical Physics Consultants, Sussex, WI
Presentations
(Saturday, 3/26/2022) 2:00 PM - 4:00 PM [Central Time (GMT-5)]
Room: Celestin ABC
The axially-acquired measurement method for Computed Tomography Dose Index Volume (CTDIvol) requires the translation of helical CT protocol technical parameters (e.g. detector configuration, bow-tie filter, dual tube contributions, etc.), which is not easily accomplished on many CT scanners. For this reason, a helically-acquired CTDIvol measurement technique has been proposed as an alternative. An initial study indicates that helically-acquired CTDIvol measurements are within acceptable limits compared with axially-acquired methods and scanner-reported CTDIvol. The American College of Radiology (ACR) has acknowledged the potential for acquiring CTDIvol measurements helically and asked for a large-scale submission of data from multiple physicists across multiple CT vendor makes and models to assess the possibility of amending the ACR’s requirement for axially-acquired CTDIvol measurements. It is worth noting that while the proposed helical methodology of measuring CTDIvol could make these measurements significantly easier, less prone to error, faster, and more reproducible than the current methodology of converting clinically used helical scans into axial scans there are some drawbacks.
This session aims to describe the motivations and proof-of-concept validation for helically-acquired CTDIvol measurements, explain how the ACR receives, reviews, and implements potential modifications to their practices, and acknowledge the gains and losses that are associated with the proposed helically-acquired CTDIvol measurement technique.
Learning Objectives:
1. Describe motivations and techniques for helically-acquired CTDIvol measurements.
2. Understand the ACR’s processes for receiving, reviewing, and implementing practice changes.
3. Recognize situations where the helically-acquired CTDIvol measurement technique improves or hinders routine testing.
Handouts
- 174-60519-15991653-182341-1436873067.pdf (D Gress)
- 174-60660-15991653-182563-975918437.pdf (T Aufdemberge)
Keywords
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