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Radiation Dose Drastically Reduced During Whole Chest MDCT
June 24, 2009Emergency 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.
This study appears in the June issue of the American Journal of Roentgenology.
The American Roentgen Ray Society (ARRS)
This study appears in the June issue of the American Journal of Roentgenology.
The American Roentgen Ray Society (ARRS)
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Alarmed by a substantial oversight in the global climate talks leading up to the United Nations Climate Change Conference in Copenhagen next month, more than 60 of the world's most prominent agricultural scientists and leaders underscored how the almost total absence of agriculture in the agreement could lead to widespread famine and food shortages in the years ahead.
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ESA spacecraft may help unravel cosmic mystery
When Europe's comet chaser Rosetta swings by Earth tomorrow for a critical gravity assist, tracking data will be collected to precisely measure the satellite's change in orbital energy. The results could help unravel a cosmic mystery that has stumped scientists for two decades.
Nanotech in Space: Rensselaer Experiment To Weather the Trials of Orbit
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Iowa State engineers develop 3-D software to give doctors, students a view inside the body
James Oliver picked up an Xbox game controller, looked up to a video screen and used the device's buttons and joystick to fly through a patient's chest cavity for an up-close look at the bottom of the heart.
Men leave: Separation and divorce far more common when the wife is the patient
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