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目的评价320排CT前瞻性心电门控心肺血管一站式成像在急性胸痛检查中的应用。方法对170例心率≤70次/min的心肺血管一站式成像影像资料进行分析,病例分为前瞻性心电门控的前瞻组(P组)和回顾性心电门控的回顾组(R)。重建所有病例冠状动脉、肺动脉、胸主动脉图像,评价图像质量并完成诊断,同时比较分析2组图像质量和辐射剂量。结果 2组满足管腔评价的血管段比例差异无统计学意义(P>0.597)。前瞻组和回顾组肺动脉[分别为(383.00±53.64)、(366.48±60.96)HU]、冠状动脉[分别为(426.31±79.75)、(407.49±91.00)HU]、胸主动脉[分别为(416.53±63.44)、(413.58±58.62)HU]、图像噪声(分别为20.46±5.84、18.55±4.67)、信噪比(分别为22.06±6.47、23.13±5.76)、对比噪声比(分别为15.12±5.43、15.92±4.77)差异均无统计学意义,2组有效剂量分别为(11.85±3.90)、(20.06±3.27)m Sv,其差异有统计学意义(P<0.01)。结论前瞻性心电门控心肺血管一站式扫描能有效降低辐射剂量并保证诊断图像质量。
Objective To evaluate the application of 320-slice CT prospective ECG-controlled cardio-pulmonary vascular imaging in acute chest pain. Methods One hundred and seventy patients with heart rate ≤70 beats / min were analyzed. The patients were divided into prospective prospective group (P group) and retrospective group (R ). The images of coronary arteries, pulmonary arteries and thoracic aorta were reconstructed in all cases, the image quality was evaluated and the diagnosis was completed. The image quality and radiation dose were compared and analyzed. Results There was no significant difference in the proportion of vascular segments between the two groups (P> 0.597). In the prospective and retrospective groups, the pulmonary arteries were (383.00 ± 53.64) and (366.48 ± 60.96) HU, respectively, with a mean of (426.31 ± 79.75) and (407.49 ± 91.00) HU, respectively (63.58 ± 58.62) HU], image noise (20.46 ± 5.84 and 18.55 ± 4.67 respectively), SNR (22.06 ± 6.47 and 23.13 ± 5.76 respectively), and the relative noise ratios were 15.12 ± 5.43 , 15.92 ± 4.77 respectively). The effective dose of the two groups were (11.85 ± 3.90) and (20.06 ± 3.27) m Sv, respectively, with statistical significance (P <0.01). Conclusions Prospective ECG-gated one-stop cardiopulmonary resuscitation can effectively reduce radiation dose and ensure diagnostic image quality.