Demystifying the CT Radiation Dose Sheet

Anzi Zhao, Sarah Fopma, Rishi Agrawal*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

1 Scopus citations


The radiation dose sheet generated by the CT scanner is a form that displays important information about an examination. It functions as a road map for the examination, detailing what CT examinations were performed and what parameters were used to perform them. One essential element of the radiation dose sheet, the volume CT dose index (CTDIvol), is a commonly used radiation dose index that is displayed on most CT scanners. The CTDIvol is used for quality control and is helpful for comparing the radiation output among different protocols and different scanners. The dose-length product (DLP) is a radiation dose index that builds on the CTDIvol by incorporation of the scan length. The DLP is combined with a conversion coefficient and used to determine the effective dose from the CT examination. Determining the effective dose is a way to estimate the whole-body radiation dose, even if the CT examination is confined to a smaller part of the body. In addition to these values, other data about the study from the CT scanner manufac-turer, including the tube voltage and tube current–time product, usually are displayed on CT scanners. These values are major deter-minants of the image quality and radiation dose. The radiation dose sheet is a useful tool for radiologists, technologists, and physicists, allowing them to comprehend the technical details of a CT exami-nation. The authors describe the components of the radiation dose sheet, the relationships of these components with one another, and the contributions of these components to the radiation dose.

Original languageEnglish (US)
Pages (from-to)1239-1250
Number of pages12
Issue number4
StatePublished - Jul 1 2022

ASJC Scopus subject areas

  • Radiology Nuclear Medicine and imaging


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