Coronary pathology is a frequent pathology presenting many complications which can be life-threatening. Coronary angiography is considered as the gold standard for exploring coronary arteries. But it is an expansive and invasive technique .
Coronary computed tomographic (CT) angiography performed with multi-detector row CT is an accurate method for noninvasive detection of coronary artery disease .
It's usually performed with retrospectively gated technique Fig. 1 who has proved to be accurate but reponsable of high effective radiation dose [2, 3].
In 2006, prospectively gated transverse...
Description of activity and work performed
This was a study conducted with a 128-detector row CT unit, over a 6-month period and including two groups of patients.
Groupe 1: 25 patients with a routine retrospectively gated helical CT technique.
Groupe 2: 25 patients with prospectively gated tranverse coronary CT angiography as they match our inclusion criteria: Herat rate < 65bpm and observed rate fluctuation < 10bpm.
The radiation dose estimates were expressed by using Fig. 3 :
CT dose index in Grays.
Dose length product (DLP) in mGy.cm
Effective dose in...
Conclusion and recommendations
Radiation dose is a concern for all cardiac imaging studies in wich ionizing radiation is used.
The reported effective radiation dose in conventional coronary angiography varies from 3,1 to 9,4 mSv, whereas in most studies the coronary CT angiography is higher [4,5].
Reported effective dose with the use of 64-multidetector row CT have ranged from 9,5 to 21,4 mSv.
Several approaches were adopted to reduce the high radiation doses with coronary Ct angiography such as :
1 - Decreasing the tube voltage:
This decrease allows...
F. El Hedhili; Tunis/TN - nothing to disclose W. Frikha; Tunis/TN - nothing to disclose S. Boukriba; Tunis/TN - nothing to disclose A. Grich; Tunis/TN - nothing to disclose Y. Ben Abdeladhim; Tunis/TN - nothing to disclose H. Mizouni; service de radiologie, Hopital la Rabta/TN - nothing to disclose
Mowatt G, Cummins E, Waugh N, Walker S, Cook J, Jia X, et al. Systematic review of the clinical effectiveness and cost-effectiveness of 64-slice or higher computed tomography angiography as an aletrnative to invasive coronary angiography in the investigation of coronary artery disease. Health Technol Assess. 2008,12(17):379-143.
Leschka S, Alkadhi H, Plass A, Desbiolles L, Grunenfelder J, Marinecek B, et al. Accuracy of MSCT coronary angiography with 64-slice technology: first experience. EurHeart J. 2005;26(15):1428-7.
Alhailiy AB, Brennan PC, McEntee MF, Kench PL, Ryan EA. Diagnostic...