Xiang Zhong Ding MD, Presenter: Nothing to Disclose

Zhen Wang, Abstract Co-Author: Nothing to Disclose

Jian-Hua Yuan, Abstract Co-Author: Nothing to Disclose

Heart rate control is an important component of 640-slice CT dose reduction. Mean heart rate during scan acquisition was significantly lower than mean heart rate on prescan. This in an important consideration when considering coronary artery angiography with 640-slice CT system in patients with different heart rates.

Retrospective analysis of heart rate variability and radiation dose during coronary artery angiography with a 640-slice CT system.

Patients (n = 100) with coronary artery disease (CAD) who underwent 640-slice CT with prospective ECG-gating without beta-blocker premedication. One hundred patients were divided into three prescan groups by mean heart rate. Group 1 with 31cases (HR < 65 bit/min). Group 2 with 53 cases (HR: 65-79 bit/min) and Group 3 with 16 cases (HR > 80bit/min). Mean heart rate and radiation dosage were recorded during the prescan and scanning period. (you should mention here if beta blockers were used? ) We performed statistical analyses on the radiation dosage and heart rate during the prescan and scan acquisition periods using parametric and nonparametric statistical tests with the SPSS13.0 software.

The heart rate during scan acquisition was significantly lower than the heart rate during prescan (reduction 4.5 bit/min, P < 0.001). Group 1 showed no difference between heart rate during scan acquisition and heart rate on prescan. The heart rate during scan acquisition was significantly lower than the heart rate on prescan in Groups 2 and 3 (reduction 4.6-8.9 bit/min, P < 0.01). The radiation dosage on during scan acquisition was also significantly different. The variation in radiation dosage of Group 1, Group 2, and Group 3 was 2.4±0.9mSv, 8.5±3.2 mSv, and 11.1±3.9mSv respectively.

Ding, X, Wang, Z, Yuan, J, Evaluation of Heart Rate Variation and Radiation Dose of Coronary Artery Angiography with a 640-slice CT System.  Radiological Society of North America 2011 Scientific Assembly and Annual Meeting, November 26 - December 2, 2011 ,Chicago IL. http://archive.rsna.org/2011/11034214.html