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Answer to Question #4712 Submitted to "Ask the Experts"Category: Medical and Dental Patient Issues — Diagnostic X Ray and CT The following question was answered by an expert in the appropriate field: Q
I would like to find out
how much radiation dose a person receives from low-dose helical/spiral CT
during a chest exam versus a regular-dose helical/spiral CT scan.
A
Typical radiation doses can vary from 1
rad to as high as 6 or 7 rad. For systems with AEC (mAs control) the
mA will be adjusted for patient attenuation and dose should be minimized
(e.g., low-dose mode) assuming all other parameters remain same, i.e., kVp,
x-ray time, pitch, table speed, etc. Otherwise, your parameters set on the
scanner will be the same for all patients, including pediatric, and may be more
than necessary to obtain a satisfactory image.
Answer posted on 2 September 2005. The information and material posted on this Web site is intended as general reference information only. Specific facts and circumstances may alter the concepts and applications of materials and information described herein. The information provided is not a substitute for professional advice and should not be relied upon in the absence of such professional advice specific to whatever facts and circumstances are presented in any given situation. Answers are correct at the time they are posted on the Web site. Be advised that over time, some requirements could change, new data could be made available, or Internet links could change. For answers that have been posted for several months or longer, please check the current status of the posted information prior to using the responses for specific applications.
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