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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.



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  		Fig. 1A. —Female RANDO phantom (The Phantom Laboratory). Photograph of phantom shows sections scanned in scout (Scout), helical, and axial acquisitions (Chest Scan). Breasts and ovary thermoluminescent dosimeter (TLD) location is also illustrated.

 


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  		Fig. 1B. —Female RANDO phantom (The Phantom Laboratory). Single axial 5-mm CT image shows phantom thorax just below carina with central chest TLD. Other white dots are tissue-equivalent plugs in nonsampled predrilled holes.

 


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  		Fig. 2A. —Phantom radiation dose (with phantom section number in parentheses). Graph shows dose in central chest (lung apex, section 11, and bases, section 22) and breast during combination helical, standard helical plus axial HRCT, standard helical, and axial high-resolution CT (HRCT) with ovarian radiation dose shown as a single data point. Organ-based error is also indicated.

 


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  		Fig. 2B. —Phantom radiation dose (with phantom section number in parentheses). Bar graph shows detailed ovarian radiation dose and error during combination helical, standard helical plus axial HRCT, standard helical, and axial HRCT.

 

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