Comparison of Multi-slice Spiral CT Imaging for Cardiac Coronary Arteries with Different Radiation Doses

Objective: To investigate the effect of different radiation dose scanning methods in the multi slice spiral CT imaging of the heart. Methods: in our hospital from January 2013 to 2015 March between Department of Cardiology in accordance with the proposed exclusion criteria of 150 patients as the research object, randomly assigned to three groups, each with 50 cases in each, in which the group 1 as control group, using retrospective ECG gating; the two groups were observed in group a, using prospective ECG gating; group 3 as observed in the B group using based on BMI optimization tube current and retrospective ECG gating. 3 groups of patients were 120 k V tube voltage scan. The use of 370 mg I/m L nonionic iodine contrast agent(iodide). Record in each group of patients with general information and measurements of original axial images in various parts of the CT value, calculate the average value of their enhanced, CT value measurement of pectoralis major, objective index analysis of SNR, CNR and BN measurement and subjective evaluation. Statistical analysis of the obtained subjective and objective indicators. Results: the three groups of objective analysis indicators SNR, CNR, BN and subjective index of RCA, LM, LAD, LCX is: the control group SNR(15.45/3.78), CNR(13.27/3.49), BR(30.44 5.53); RCA(3.62/0.54), LM(3.84/0.39), the LAD(3.72 0.42); LCX(3.49/0.48), average(3.63 0.42); Observation group A SNR(15.08/3.05), CNR(13.03/2.91), BR(30.93 4.52); RCA(3.61/0.52), LM(3.82/0.42), the LAD(3.68 0.49); LCX(3.52/0.51), average(3.62 0.44); Observation group B SNR(14.43/2.71), CNR(12.38/2.54), BR(32.06 3.61); RCA(3.60/ 0.51), LM(3.79/0.41), the LAD(3.64 0.47); LCX(3.48/0.49), average(3.59/0.43). Observe group A and group B and control group in two comparative difference was not significant(<i<P</i<>0.05); Observe group A and group B radiation dose index CTDIVOL, DLP, ED value are: control group CTDIVOL(57.29/2.17), DLP(1025.37/65.38), ED(14.35 0.98); Group A: CTDIVOL(19.86/1.45), DLP(256.84/25.93), ED(3.56 0.34); Group B: CTDIVOL(29.84/6.19), DLP(513.54/98.43), ED(7.17/1.39). Group A was significantly lower than the control group(0.015, 0.031, 0.015, 0.031, 0.094); Group B was significantly lower than the control group(0.015, 0.031, 0.015, 0.031, 0.044); Which observe the indicators of group A was significantly lower than group B(0.014, 0.016, 0.014, 0.016, 0.012). Conclusion: using 256 layer spiral CT prospective heart switch control and switch control method based on BMI optimization were retrospectively heart can full figure in the process of coronary artery imaging diagnostic image quality and significantly reduce the radiation dose, the prospective heart than BMI optimization control technology of switch tube current retrospective heart switch control method effect is more obvious.