Masao Kiguchi RT, Presenter: Nothing to Disclose

Jun Horiguchi MD, Abstract Co-Author: Research grant, General Electric Company Research grant, YMS

Chikako Fujioka RT, Abstract Co-Author: Nothing to Disclose

Masashi Hieda, Abstract Co-Author: Nothing to Disclose

Chihiro Tani, Abstract Co-Author: Nothing to Disclose

Katsuhide Ito MD, Abstract Co-Author: Nothing to Disclose

Eiji Nishimaru, Abstract Co-Author: Nothing to Disclose

Cheng Zhou MD, Abstract Co-Author: Nothing to Disclose

Yun Shen PhD, Abstract Co-Author: Employee, General Electric Company

00030490-DMT et al, Abstract Co-Author: Nothing to Disclose

The purpose of this prospective study was to whether image noise (standard deviation of CT value) on coronary 64-MDCT angiography is optimized by attenuation on the scout view.

The study was approved by our institutional review committee. Patients (n=180) suspected of coronary artery disease were divided into two protocols; Group A (n=50), tube current modified by body mass index (BMI) and Group B (n=130), tube current modified by scout view attenuation. The image noise in each group was plotted against BMI. The effective dose was estimated by CT dose index.

The mean image noise and estimated effective dose was 23.3±4.2 HU and 19.3±4.4 mSv in Group A and 24.5±4.1 HU and 21.0±5.7 mSv in Group B, respectively. The image noise in Group A was markedly correlated with the BMI, expressed as the following equation; noise = 0.80 x BMI + 5.2 (p<0.01, Pearson; r=0.69). In contrast, the correlation between the image noise and BMI in Group B was low; noise = 0.45 x BMI + 13.8 (p<0.01, Pearson; r=0.39).

Scout view attenuation-based control has the potential to offer patient-tailored tube current on coronary 64-MDCT angiography.

The difference in individual body habitus cannot be controlled by BMI. The tube current control based on scout view attenuation is recommended.

Kiguchi, M, Horiguchi, J, Fujioka, C, Hieda, M, Tani, C, Ito, K, Nishimaru, E, Zhou, C, Shen, Y, et al, 0, Scout View Attenuation-based Tube Current Control in Coronary 64-MDCT Angiography.  Radiological Society of North America 2009 Scientific Assembly and Annual Meeting, November 29 - December 4, 2009 ,Chicago IL. http://archive.rsna.org/2009/8006702.html