Size specific dose estimate (SSDE) measured in mGy, is a method of estimating CT radiation dose that takes a patient's size into account.
CTDIvol and DLP are common methods to estimate a patient's radiation exposure from a CT procedure. The exposures are the same regardless of patient size, but the size of the patients is a factor in the overall patient's absorbed dose.
Coefficients were developed to help transform a patient's exposure to absorbed dose if the AP and lateral dimensions of the patient are provided. Various methods are discussed in the reference articles.
SSDE does not take the organs in the CT scan's field of view into account, so it is not a measure of effective dose.
- 1. Brady SL, Kaufman RA. Investigation of American Association of Physicists in Medicine Report 204 size-specific dose estimates for pediatric CT implementation. (2012) Radiology. 265 (3): 832-40. doi:10.1148/radiol.12120131 - Pubmed
- 2. Brink JA, Morin RL. Size-specific dose estimation for CT: how should it be used and what does it mean?. (2012) Radiology. 265 (3): 666-8. doi:10.1148/radiol.12121919 - Pubmed
- 3. American Association of Physicists in Medicine. Size-specific dose estimates (SSDE) in pediatric and adult body CT Examinations: report of AAPM Task Group 204. College Park, Md: American Association of Physicists in Medicine, 2011.
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