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Updated: Jun 29, 2026
06:20
Irradiator Commissioning and Dosimetry for Assessment of LQ α and β Parameters, Radiation Dosing Schema, and in vivo Dose Deposition
Published on: March 11, 2021
CT dose: how to measure, how to reduce.
1Mayo Clinic, Rochester, MN 55905, USA. mccollough.cynthia@mayo.edu
Health Physics
|October 14, 2008
Summary
Computed Tomography (CT) radiation dose is managed using CT Dose Index (CTDI) and Dose Length Product (DLP). Advanced technologies like tube current modulation significantly reduce radiation exposure, making CT scans safer.
Area of Science:
- Medical Imaging
- Radiology
- Radiation Physics
Background:
- Computed Tomography (CT) radiation dose is quantified by CT Dose Index (CTDI) and Dose Length Product (DLP).
- Effective dose estimation accounts for non-uniform exposure risks.
- Tube current modulation is a key technology for dose management in CT.
Purpose of the Study:
- To explain fundamental CT radiation dose parameters.
- To highlight the role of tube current modulation in dose reduction.
- To reassure patients about decreasing radiation doses in CT.
Main Methods:
- Definition and explanation of CTDI, DLP, and effective dose.
- Description of tube current modulation techniques (angular, longitudinal, combined).
- Review of technological advancements in CT imaging over two decades.
Main Results:
- Tube current modulation can achieve dose reductions of 20-50%.
- Despite expanded capabilities, the dose per typical CT exam has decreased by over 50% in the last 20 years.
- Technological evolution continuously lowers radiation exposure in CT.
Conclusions:
- CTDI and DLP are fundamental parameters for radiation dose assessment.
- Tube current modulation is an effective strategy for reducing CT radiation dose.
- Patients benefit from decreasing radiation doses in medically justified CT examinations due to ongoing technological advancements.
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