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Radiation Dose to Adults From Common Imaging Examinations. For the most current information, visit radiologyinfo.org. 05.22. Note: This chart simplifies a highly complex topic for patients’ informational use. The effective doses are typical values for an average-sized adult.
The scientific unit of measurement for whole body radiation dose, called "effective dose," is the millisievert (mSv). Other radiation dose measurement units include rad, rem, roentgen, sievert, and gray. Doctors use "effective dose" when they talk about the risk of radiation to the entire body.
Here are radiation doses for common procedures if you get a scan with contrast, and then one without contrast: Belly and pelvis: 20 mSv, equal to about 7 years of background radiation
The computed tomography dose index (CTDI) is a commonly used radiation exposure index in X-ray computed tomography (CT), first defined in 1981. [1] [2] The unit of CTDI is the gray (Gy) and it can be used in conjunction with patient size to estimate the absorbed dose.
22 Μαρ 2013 · The absorbed radiation dose is the amount of energy absorbed per unit mass at a specific point and is measured in grays (1 Gy = 1 J/kg). The effective dose is a weighted average of the doses to all exposed organs taking into account varying organ radiosensitivities of different organs.
Radiation doses varied significantly between the different types of CT studies. The overall median effective doses ranged from 2.1 milli-Sieverts (mSv) for a routine head CT (interquartile range [IQR] 1.8–2.8) to 31 mSv (IQR 21–43) for a multiphase abdomen and pelvis CT.
This document contains radiation dosimetry information from CT scans and can be used by investigators to estimate the dosimetry information required by the JRSC or RDRC for research protocols involving human subjects.
