Abstract:

BACKGROUND: Multi-slice spiral CT coronary angiography is an impartment screening techniques in the evaluation of coronary stent implantation, but patients need receive larger radiation doses of X-ray.
OBJECTIVE: To evaluate the clinical value of low-dose dual-source CT angiography (DSCTA) imaging in the evaluation of postoperative stenting of coronary arteries.
METHODS: Totally 45 patients with 63 previously implanted coronary stents underwent prospective Electro-Chemical Grindion (ECG) gating (prospective) using DSCTA. Patency of stented and non-stented coronary arteries was observed and compared with digital subtraction angiography (DSA) gold standard. Fifty patients who underwent retrospective ECG gating (retrospective) using CT angiography were randomly selected for the analysis of irradiation dose comparison.
RESULTS AND CONCLUSION: Compared with the DSA, DSCTA showed correct rate of the stent patency was 96.8% and of the non-stent patency was 96.5% in the prospective group. The radiation dose in the prospective group was significantly lower than that of the retrospective group (P < 0.01). It is indicated that DSCTA yields not only high quality images but lower radiation dose under the permission of heart rate or rhythm, which suggests that DSCTA could be clinically useful for assessing postoperative coronary stenting.