RESUMEN
Objective To contrast the radiation dose to patients of 320 row CT coronary artery imaging (CTCA) and coronary angiography(CAG) .Methods 90 patients random sampled with 320 row CTCA were group A .Among of them ,7 patients with cal-cification integral scanning (CI) were A1 group;43 patients with CT coronary artery imaging/cardiac function analysis scanning (CTCA/CFA) were A2 group;40 patients with Prospective scanning (Prospective CTA ) were A3 group;139 patients random sam-pled with CAG were group B .Results Radiation dose had statistically significant between Group A and group B ,A1 and B ,A2 and B ,A1 and A3 ,A2 and A3(P0 .05) .Conclusion In order to reduce the radiation dose to patients ,the prospective CTCA was used in the patients need 320 row CTCA as far as possible .