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Radiation Dose Drastically Reduced During Whole Chest MDCT

Date:
June 23, 2009
Source:
American Roentgen Ray Society
Summary:
Emergency physicians who evaluate patients with nonspecific chest pain using whole chest multidetector CT (MDCT) combined with retrospective electrocardiogram (ECG) gating can reduce the patient radiation dose by 71 percent using MDCT combined with prospective ECG triggering instead, according to a new study.

Emergency physicians who evaluate patients with non-specific chest pain using whole chest multi-detector CT (MDCT) combined with retrospective electrocardiogram (ECG) gating can reduce the patient radiation dose by 71% using MDCT combined with prospective ECG triggering instead, according to a study performed at the University of Washington School of Medicine, Seattle, WA.

Prospective ECG triggering enables the CT scanner to monitor the ECG signal of several heart beats in real time and turns the radiation beam on only during alternate beats; retrospective ECG gating also monitors the ECG signal of heartbeats but turns the radiation beam on throughout several consecutive beats, thus delivering more radiation.

Seventy-two emergency department patients with non-specific chest pain were referred for MDCT of the whole chest. A total of 41 patients were scanned using retrospective gating and 31 were scanned using prospective triggering. “The average radiation dose delivered with retrospective gating was approximately 32 mSv; the average radiation dose delivered with prospective triggering was 9 mSv,” said William P. Shuman, MD, lead author of the study. In addition, image quality was slightly better with prospective triggering.

“As our study suggests, patients benefit from MDCT scans using ECG triggering because it delivers a much lower radiation dose—opening the utility of CT to more patients. This lower dose is particularly useful when non-specific indications suggest scanning of the whole chest, such as in the “triple rule-out.” Emergency rooms face severe congestion and cost constraints in today’s world, plus a need for accurate, swift diagnosis. Lower dose, high image quality ECG triggered CT will help significantly on all of those fronts,” said Dr. Shuman.


Story Source:

The above story is based on materials provided by American Roentgen Ray Society. Note: Materials may be edited for content and length.


Journal Reference:

  1. Shuman et al. Whole-Chest 64-MDCT of Emergency Department Patients with Nonspecific Chest Pain: Radiation Dose and Coronary Artery Image Quality with Prospective ECG Triggering Versus Retrospective ECG Gating. American Journal of Roentgenology, 2009; 192 (6): 1662 DOI: 10.2214/AJR.08.1872

Cite This Page:

American Roentgen Ray Society. "Radiation Dose Drastically Reduced During Whole Chest MDCT." ScienceDaily. ScienceDaily, 23 June 2009. <www.sciencedaily.com/releases/2009/06/090623133529.htm>.
American Roentgen Ray Society. (2009, June 23). Radiation Dose Drastically Reduced During Whole Chest MDCT. ScienceDaily. Retrieved October 21, 2014 from www.sciencedaily.com/releases/2009/06/090623133529.htm
American Roentgen Ray Society. "Radiation Dose Drastically Reduced During Whole Chest MDCT." ScienceDaily. www.sciencedaily.com/releases/2009/06/090623133529.htm (accessed October 21, 2014).

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