You could be reading the full-text of this article now if you...

If you have access to this article through your institution,
you can view this article in

Reduction of Interpatient Variability of Arterial Enhancement Using a New Bolus Tracking System in 320-Detector Computed Tomographic Coronary Angiography

Tatsugami, Fuminari MD*; Awai, Kazuo MD*; Takada, Haruhiko RT; Yoshikawa, Shushi RT; Takeda, Yoshihiro MD; Morita, Hideaki MD; Narumi, Yoshifumi MD

Journal of Computer Assisted Tomography:
doi: 10.1097/RCT.0b013e318278e996
Cardiovascular Imaging
Abstract

Objective: To investigate the effect of a new bolus tracking system on interpatient variability of aortic and coronary enhancement compared with the conventional system in 320-detector computed tomographic (CT) coronary angiography (CTCA).

Methods: Sixty-four patients who underwent CTCA were assigned to 1 of 2 protocols. In group A (n = 32), 7 seconds after triggering (150-Hounsfield unit [HU] threshold) in the ascending aorta, a CT scan was performed. In group B (n = 32), 2 thresholds were set in the ascending aorta. After the first triggering (100 HU threshold), the patient was instructed to take a breath and hold it. Approximately 3 seconds after the second triggering (300 HU threshold), a CT scan was started automatically.

Results: There were no significant differences in the mean CT attenuation for the ascending aorta between the 2 groups (P = 0.61), whereas the standard deviation of the CT attenuation in group B was significantly smaller than that in group A (P = 0.02).

Conclusions: The use of a 2-threshold setting in the new bolus tracking technique could reduce interpatient variability more than a protocol using a single threshold in CTCA.

Author Information

From the *Department of Diagnostic Radiology, Hiroshima University, Hiroshima, Japan; †Department of Radiology, and ‡Internal Medicine III, Osaka Medical College, Takatsuki City, Osaka, Japan.

Received for publication August 11, 2012; accepted October 12, 2012.

Reprints: Fuminari Tatsugami, MD, Department of Diagnostic Radiology, Hiroshima University, 1-2-3 Kasumi, Minami-ku, Hiroshima 734-8551, Japan (e-mail: sa104@rg8.so-net.ne.jp).

The authors have no funding or conflicts of interest to disclose.

© 2013 Lippincott Williams & Wilkins, Inc.