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AJR 2005; 184:742-745
© American Roentgen Ray Society

Original Report

Radiation Cost of Helical High-Resolution Chest CT

David A. Leswick1, Steve T. Webster2, Brad A. Wilcox3 and Derek A. Fladeland1

1 Department of Radiology, Royal University Hospital, 103 Hospital Dr., Saskatoon, SK S7N 0W8, Canada.
2 Saskatchewan Labour, Occupational Health and Safety Division, Saskatoon, SK S7K 2H6, Canada.
3 Department of Nuclear Medicine, Regina General Hospital, Regina, SK S4P 0W5, Canada.

OBJECTIVE. In our department, most high-resolution CT (HRCT) scans of the lungs are performed in conjunction with a standard helical examination to assess the entire chest. This requires scanning the patient twice. The goal of this study was to determine if the radiation dose could be decreased by performing a single combination helical scan of the chest from which both 5-mm standard and 1.25-mm HRCT images could be obtained.

CONCLUSION. Because the total measured radiation dose is 32% greater from a single combination helical HRCT scan of the chest versus separate standard helical plus axial HRCT scans, helical HRCT is not a clinically advisable technique.


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