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Radiologists Can Dramatically Lower Cardiac CT Radiation Dose In Some Patients

Date:
April 10, 2009
Source:
American Roentgen Ray Society
Summary:
Radiologists can now lower the radiation dose delivered by cardiac CT angiography by 39 percent in adult patients weighing 185 pounds or less, according to a new study.
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Radiologists can now lower the radiation dose delivered by cardiac CT angiography by 39% in adult patients weighing 185 pounds or less, according to a study performed at the University of Erlangen in Erlangen, Germany.

The study included one hundred patients, weighing 185 pounds or less, who underwent cardiac CT angiography either using a tube voltage of 120 kV or 100 kV. Results showed that the effective radiation dose for patients scanned with 120 kV ranged from 8.8 to 16.9 mSv; the effective radiation dose for patients scanned with 100 kV ranged from 4.9 to 11.9 mSv. “At the same time, the overall image quality was preserved. Image quality scores using 120 kV were 2.7 plus/minus 0.5; scores using 100 kV were 2.6 plus/minus 0.4,” said Tobias Pflederer, MD, lead author of the study.

“Coronary CT angiography has tremendously high accuracy for detecting and ruling out coronary artery stenosis. It is expected that indications for coronary CT angiography will grow in the future,” he said.

“The standard coronary CT angiography protocol uses the higher tube voltage value of 120 kV however our study shows that 100 kV can be used instead. It is important to keep the radiation dose as low as possible, especially in younger and female patients,” said Dr. Pflederer.

This study appears in the April issue of the American Journal of Roentgenology.


Story Source:

The above post is reprinted from materials provided by American Roentgen Ray Society. Note: Materials may be edited for content and length.


Journal Reference:

  1. Pflederer et al. Image Quality in a Low Radiation Exposure Protocol for Retrospectively ECG-Gated Coronary CT Angiography. American Journal of Roentgenology, 2009; 192 (4): 1045 DOI: 10.2214/AJR.08.1025

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American Roentgen Ray Society. "Radiologists Can Dramatically Lower Cardiac CT Radiation Dose In Some Patients." ScienceDaily. ScienceDaily, 10 April 2009. <www.sciencedaily.com/releases/2009/04/090403122021.htm>.
American Roentgen Ray Society. (2009, April 10). Radiologists Can Dramatically Lower Cardiac CT Radiation Dose In Some Patients. ScienceDaily. Retrieved July 30, 2015 from www.sciencedaily.com/releases/2009/04/090403122021.htm
American Roentgen Ray Society. "Radiologists Can Dramatically Lower Cardiac CT Radiation Dose In Some Patients." ScienceDaily. www.sciencedaily.com/releases/2009/04/090403122021.htm (accessed July 30, 2015).

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