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European Radiology
Published in: European Radiology 5/2011

01-05-2011 | Computed Tomography

Radiation dose from volumetric helical perfusion CT of the thorax, abdomen or pelvis

Authors: Vicky Goh, Minaxi Dattani, Joseph Farwell, Jane Shekhdar, Emily Tam, Shilpan Patel, Jaspal Juttla, Ian Simcock, James Stirling, Henry Mandeville, Edwin Aird, P. Hoskin

Published in: European Radiology | Issue 5/2011

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Abstract

Purpose

To evaluate the radiation doses delivered during volumetric helical perfusion CT of the thorax, abdomen or pelvis.

Materials and methods

The dose-length product (DLP) and CT dose index (CTDIvol) were recorded and effective dose (E) determined for patients undergoing CT (4D adaptive spiral) for tumour evaluation. Image noise and contrast to noise (CNR) at peak enhancement were also assessed for quality.

Results

Forty two consecutive examinations were included: thorax (16), abdomen (10), pelvis (16). Z-axis coverage ranged from 11.4 to 15.7 cm. Mean DLP was 1288.8 mGy.cm (range: 648 to 2456 mGy.cm). Mean CTDIvol was 96.2 mGy (range: 32.3 to 169.4 mGy). Mean effective dose was 19.6 mSv (range: 12.3 mSv to 36.7 mSv). In comparison mean DLP and effective dose was 885.2 mGy.cm (range: 504 to 1633 mGy.cm) and 13.3 mSV (range: 7.8 to 24.5 mSv) respectively for the standard staging CT thorax, abdomen and pelvis. Mean tumour CNR at peak enhancement was 1.87.

Conclusion

The radiation dose imposed by perfusion CT was on average 1.5 times that of a CT thorax, abdomen and pelvis. The dose is not insubstantial, and must be balanced by the potential clinical utility of additional physiologic data. Further efforts towards dose reduction should be encouraged.
Appendix
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Metadata
Title
Radiation dose from volumetric helical perfusion CT of the thorax, abdomen or pelvis
Authors
Vicky Goh
Minaxi Dattani
Joseph Farwell
Jane Shekhdar
Emily Tam
Shilpan Patel
Jaspal Juttla
Ian Simcock
James Stirling
Henry Mandeville
Edwin Aird
P. Hoskin
Publication date
01-05-2011
Publisher
Springer-Verlag
Published in
European Radiology / Issue 5/2011
Print ISSN: 0938-7994
Electronic ISSN: 1432-1084
DOI
https://doi.org/10.1007/s00330-010-1997-y

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