Objective To evaluate the feasibility of prospective electrocardiogram(ECG)-gating computed tomography coronary angiography(CTCA).Methods Sixty patients with suspected or known coronary artery disease underwent 64-slice CTCA using prospective ECG-gating.Multi-planar reconstruction (MPR),curved-planar reconstruction(CPR),maximum intensity projection(MIP)and volume rendering (VR)were used to demonstrate the coronary arteries.The image quality and radiation dose was evaluated.Results The mean effective radiation dose was(2.7±0.2)mSv.93.3%(720/772)segments of all coronary arteries were of diagnostic image quality,44.2%(341/772)Was classified as excellent and 49.1%(379/772)was good.Non-diagnostic coronary segments were found in 6.7%(52/772)of all coronary arteries.Therewere 5(8.3%)cases with severe coronary stenosis(＞75%)or occlusion,17(28.4%)cases with moderate stenosis(50%-75%),18(30.0%)cases with mild stenosis(＜50%)or irregular lumen,20(33.3%)cases with normal coronary artery.Conclusion With a low radiation dose,prospective electrocardiogram(ECG)-gated coronary 64-MSCT angiography has a good potential for the detection of coronary stenosis,especially for excluding coronary artery disease.

Objective To investigate the intra-laboratory turnaround time(ILTAT) of the emergency biochemistry tests and to analyze the factors influencing ILTAT in order to adopt the corresponding improvement measures for perfecting the service quality and ensuring the patient medical safety.Methods ILTAT of the emergency biochemical specimens in our hospital from June to November 2015 was performed the retrospective statistics for comparing the determination timely rate between ILTAT≤60 min and ILTAT2 ≤120 min.ILTAT at different time periods in laboratory was emphatically analyzed.Results The determination timely rate of ILTAT ≤120min(ILTAT 1) was 98.8%(8638/8743),and which of ILTAT ≤60min(ILTAT 2) was 83.7%(7317/8743).The determination timely rate of ILTAT1 had no statistical difference among different time periods (χ2=3.36,P>0.05).The determination timely rate of ILTAT2 had statistical difference among different time periods(χ2=134.5,P<0.01).The determination timely rate of T 2(10:01-12:00) was highest (88.1%),which of T1 (8:01-10:00) was lowest(76.8%),which of T3(12:01-14:00) and T7 (6:01-8:00) was lower (79.4% and 80.2% respectively).Conclusion At present,ILTAT in our laboratory meets the requirements of the current regulations.Analyzing the ILTAT influencing factors in the emergency biochemistry,optimizing the workflow,improving the equipments and staffing allocation and improving the degree of information processing can further shorten the emergency biochemical ILTAT,and better meet the clinical and patient′s needs.