SU‐FF‐I‐36: Comparison of Vendor Estimated CTDIvol and Physicist Calculated CTDIvol

Purpose: To determine if CT unit's estimated CTDIvol is statistically similar to values obtained using conventional medical physics testing and instrumentation. The ACR calculation spreadsheet was used to calculate the CTDIvol for each unit tested. Method and Materials: Exposure measurements we...

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Bibliographic Details
Published in:Medical Physics 2009-06, Vol.36 (6), p.2442-2442
Main Authors: Johnson, P, Stenroos, K, Davros, W
Format: Article
Language:English
Subjects:
Computed tomography
Dosimetry
Materials analysis
Medical physics
Physicists
Testing procedures
Online Access:Get full text
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Summary:Purpose: To determine if CT unit's estimated CTDIvol is statistically similar to values obtained using conventional medical physics testing and instrumentation. The ACR calculation spreadsheet was used to calculate the CTDIvol for each unit tested. Method and Materials: Exposure measurements were obtained from the center and 12 o'clock position for both a 32 cm diameter abdominal and 16 cm diameter acrylic head phantom. The measurements were made using axial scans for typical patient abdominal and head protocols. Five CT units were evaluated. Results: Examination of the results indicate good statistical agreement between the CT unit CTDIvol estimates and the ACR dose spreadsheet calculated CTDIvol. Conclusion: This work indicates that estimating patient dose (i.e., CTDIvol) using CT unit values may be an accepted alternative to performing traditional measurements using acrylic phantoms.
ISSN:0094-2405
2473-4209
DOI:10.1118/1.3181155