Va s c u l a r I m a g i n g • O r i g i n a l R e s e a r c h Bae et al. Contrast Enhancement in Cardiovascular MDCT

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Vascular Imaging Original Research

Contrast Enhancement in Cardiovascular MDCT: Effect of Body Weight, Height, Body Surface Area, Body Mass Index, and Obesity Kyongtae T. Bae1 Brian A. Seeck 2 Charles F. Hildebolt 3 Cheng Tao1 Fang Zhu1 Masayuki Kanematsu 4 Pamela K. Woodard 3 Bae KT, Seeck BA, Hildebolt CF, et al.

Keywords: aorta, cardiac CT, CT angiography, vascular imaging

OBJECTIVE. The purpose of our study was to evaluate the effect of body weight, height, body surface area (BSA), body mass index (BMI), and obesity on aortic contrast enhancement in cardiac MDCT. MATERIALS AND METHODS. Seventy-three consecutive patients underwent cardiac CT angiography on a 64-MDCT scanner. Seventy-five mL of contrast medium (350 mg I/ mL) was injected at 4.5 mL/s, followed by a 40-mL saline flush at 4.5 mL/s. The scanning delay of CT was determined with a bolus tracking technique. Aortic attenuation was measured over the aortic-root lumen. BMI and BSA were calculated from the patient’s body weight and height. The patients were divided into low- (BMI