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Second-generation CT scanner substantially reduces radiation exposure
Date:1/31/2013

Effective radiation dose was estimated by multiplying the dose-length producta calculation of the radiation dose for a series of scans or entire examinationby an effective dose conversion factor and reported with size-specific dose estimates (SSDEs). Image quality was evaluated by two independent readers.

The median radiation dose was 0.93 millisieverts (mSv) with the second-generation unit and 2.67 mSv with the first-generation unit. The median SSDE was 6.0 milligray (mGy) with the second-generation unit and 13.2 mGy with the first-generation unit. Overall, the radiation dose was less than 0.5 mSv for 23 of the 107 CT angiography examinations (21.5 percent), less than 1 mSv for 58 (54.2 percent), and less than 4 mSv for 103 (96.3 percent). All studies were of diagnostic quality, with most having excellent image quality.

"The second-generation CT scanner provided excellent image quality over a wide range of body sizes and heart rates at low radiation doses," Dr. Chen said. "The low dose achieved during CT angiography could be used to minimize overall radiation dose to the patient or to enable additional types of imaging within reasonable radiation doses."


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Contact: Linda Brooks
lbrooks@rsna.org
630-590-7762
Radiological Society of North America
Source:Eurekalert

Page: 1 2

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