Document Detail

Reducing radiation exposure from survey CT scans.
MedLine Citation:
PMID:  16037529     Owner:  NLM     Status:  MEDLINE    
OBJECTIVE: The purpose of this study was to focus attention on the technique factors commonly used in survey CT scans (e.g., scout, topogram, or pilot scans) to measure the radiation exposure from typical survey CT scans, to compare their exposure to that of typical chest radiographs, and to explore methods for radiation exposure reduction. MATERIALS AND METHODS: The default survey CT scans on 21 CT scanners, representing three different vendors and 11 different models, were investigated. Exposure measurements were obtained with an ion chamber at isocenter and adjusted to be consistent with standard chest radiographic exposure measurement methods (single posterior-anterior projection). These entrance exposures were compared with those of typical chest radiographs, for which the mean for average-sized adults is 16 mR (4.1 x 10(-6) C/kg). RESULTS: The entrance exposures of the default survey CT scans ranged from 3.2 to 74.7 mR (0.8 to 19.3 x 10(-6) C/kg), which is equivalent to approximately 0.2 to 4.7 chest radiographs. By changing the default scan parameters from 120 kVp to 80 kVp and the tube position from 0 degrees (tube above table) to 180 degrees (tube below table), the entrance exposure for the survey CT scan was reduced to less than that of one chest radiograph for all CT scanners. CONCLUSION: For institutions at which the interpreting radiologists do not rely heavily on the appearance of the survey CT image, we recommend adjusting the technique parameters (kilovoltage and X-ray tube position) to decrease radiation exposure, especially for vulnerable patient populations such as children and young women.
Jennifer C O'Daniel; Donna M Stevens; Dianna D Cody
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Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  AJR. American journal of roentgenology     Volume:  185     ISSN:  0361-803X     ISO Abbreviation:  AJR Am J Roentgenol     Publication Date:  2005 Aug 
Date Detail:
Created Date:  2005-07-22     Completed Date:  2005-10-05     Revised Date:  2008-02-15    
Medline Journal Info:
Nlm Unique ID:  7708173     Medline TA:  AJR Am J Roentgenol     Country:  United States    
Other Details:
Languages:  eng     Pagination:  509-15     Citation Subset:  AIM; IM    
Department of Radiation Physics, Unit 94, The University of Texas M. D. Anderson Cancer Center, Houston, TX 77030, USA.
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MeSH Terms
Body Size
Models, Theoretical
Radiation Dosage*
Radiography, Thoracic
Tomography Scanners, X-Ray Computed
Tomography, X-Ray Computed* / methods

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