Accreditation: This course is accredited by ASRT - an approved continuing education provider of ARRT.
Release Date: 10/1/2012
Expiration Date: 10/31/2018

Strategies for Computed Tomography Dose Reduction

Therese Duggan-Jahns, RT(R)(CT)(MR)(M)

*Manager, Diagnostic Imaging, Franciscan Health System, St. Clare and St. Anthony Hospitals, Tacoma, Washington.
Address correspondence to: Therese Duggan-Jahns, RT(R)(CT)(MR)(M), St. Clare Hospital, 11315 Bridgeport Way S.W., Lakewood, WA 98499. E-mail:

Disclosures: Ms Duggan-Jahns reports having no significant financial or advisory relationships with corporate organizations related to this activity.


Computed tomography (CT) is an advanced imaging modality that has become indispensable in a variety of clinical applications. However, the utility of CT has sometimes been limited by safety concerns related to the level of radiation exposure required for imaging. It is therefore critical that radiologic technologists understand the imaging parameters that can contribute to radiation dose, and the available techniques, as well as hardware and software, that can help mitigate radiation dose delivered to patients undergoing CT. After a brief review of the history of CT imaging, this article will discuss the advantages of CT imaging as compared to conventional X-ray, review CT imaging parameters that can contribute to radiation dose, and explain radiation dose units for reporting and measuring dose. In addition, the article will address new software and hardware options to reduce radiation dose during CT procedures, and recent updates to CT radiation dose regulations as the result of efforts by government and professional agencies. These discussions will be rounded out by a description of the role of the CT technologist in overseeing CT techniques and protocols for low-dose radiation techniques, as well as CT dose reduction strategies in clinical practice.

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