256层螺旋CT冠状动脉造影对高心率患者的成像质量及诊断效率评价
发布时间:2018-03-10 14:31
本文选题:256排多层螺旋CT 切入点:图像质量 出处:《吉林大学》2012年硕士论文 论文类型:学位论文
【摘要】:目的: 评估256层螺旋CT冠状动脉造影中高心率患者的图像质量以及50%以上狭窄检出率的准确性。 材料与方法: 对31例于30天内行冠状动脉CT造影及传统血管造影的患者进行回顾性分析,其中男17例,女14例。入组患者根据心率分为两组,A组患者平均心率<75次/分,其中男性5例,女性8例,平均年龄(56.6±10.3)岁,B组患者平均心率≥75次/分,其中男性12例,女性6例,平均年龄(57.6±9.8)岁。所有患者均行256层螺旋CT回顾性心电门控成像。由两名放射线科医生进行图像重建,并选择最佳期相进行分析,对直径大于1mm的冠状动脉节段进行评估(1分为无运动伪影,5分为无法诊断)。图像质量的客观评价包括轴位测量升主动脉水平冠状动脉左主干的CT值及噪声,对于管腔直径狭窄大于50%的患者,进行血管造影检查。对于冠状动脉的前降支、回旋支、右冠状动脉的图像质量及平均心率、心率波动进行线性相关分析。以血管造影为标准,按节段及血管为基础对CT冠状动脉造影诊断的准确性进行评估。 结果: A组的平均心率为(63.7±9.0)次/分, B组的平均心率为(82.9±5.8)次/分。因冠状动脉解剖变异(32)及血管直径过小(7例),共有39个节段(7.4%)无法评估,其中A组有19个节段(6.2%),B组有20个节段(9%)。A组图像质量的主观评分为(1.38±0.26),B组图像质量的主观评分为(1.35±0.29),两组无统计学差异(P=0.761)。A组图像质量的主观评分为1的有259例(90.2%),B组图像质量的主观评分为1的有158个节段(78.6%)。A组图像质量中有17个节段(6.0%)评分为2,而B组图像质量中有18个节段(9.0%)。图像质量评分为3的A组有4个节段(1.4%),B组有13个节段(6.5%)。所有图像质量评分均低于3分。两名医生对图像的主观评价有较强的一致性(κ=0.84,p 0.001)。所有冠状动脉节段的图像质量评分与平均心率没有相关性(r=0.176; P=0.344)。右冠状动脉节段的图像质量评分与平均心率没有相关性(r=0.122; P=0.513)。左冠状动脉节段的图像质量评分与平均心率没有相关性(r=0.123; P=0.510)。左回旋支各节段的图像质量评分与平均心率没有相关性(r=0.157; P=0.398)。A组的平均心率波动为(4.9±2.2)次/分,B组的平均心率波动为(5.1±2.4)次/分,两组心率波动统计学无差异(P=0.729)。冠状动脉节图像质量与心率波动无相关性(r=-0.74; P=0.691)。对主观评价而言,A组升主动脉的强化值为(362.2±72.8)HU,B组升主动脉的强化值为(354.1±68.6)HU,无统计学差异(P=0.755)。A、B两组的图像噪声分别为22.2±4.9及21.3±4.6,无统计学差异(P=0.620)。大于50%狭窄的检出中,以节段为基础的A、B两组的准确率分别为97.1%(297/306)和95.0%(210/221),,敏感性分别为94.0%(47/50)和89.7%(26/29),特异性分别为97.7%(250/256)和96.8%(184/190)。以血管为基础的A、B两组的准确率分别为92.6%(50/54)和94.9%(37/39),敏感性分别为96.4%(27/28)和95.2%(20/21),特异性分别为88.5%(23/26)和83.5%(15/18)。 结论: 心率快慢对256层螺旋CT冠状动脉造影回顾性心电门控成像的影响较小,高心率患者CT造影的图像质量可以满足诊断要求。256层螺旋CT冠状动脉造影回顾性心电门控成像可以应用于高心率患者,尤其是对β受体阻滞剂有禁忌症的高心率患者。
[Abstract]:Objective:
To evaluate the image quality of patients with high cardiac rate in 256 slice spiral CT coronary angiography and the accuracy of more than 50% stenosis detection rates.
Materials and methods:
Of 31 patients in 30 days after coronary CT angiography and conventional angiography were retrospectively analyzed, including 17 cases of male, female 14 cases. Patients were divided into two groups according to heart rate, average heart rate of patients in group A < 75 / min, there were 5 males and 8 females, the average age (56.6 + 10.3), patients in the B group than the average heart rate of 75 beats per minute, there were 12 males and 6 females, the average age (57.6 + 9.8) years old. All patients underwent 256 slice spiral CT imaging. Retrospective ECG gated images were reconstructed by two radiologists, and select the best phase analysis of assessment of coronary artery segment diameter greater than 1mm (1 = no motion artifacts, 5 points can not be diagnosed). Image quality assessment including axial measurement of left main coronary artery ascending aortic CT value and the level of noise, the luminal diameter stenosis more than 50% patients, performed angiography for. The image quality and mean heart rate and the heart rate fluctuation of the anterior descending branch of the coronary artery, the circumflex artery and the right coronary artery were analyzed by linear correlation analysis. Based on angiography, the accuracy of CT coronary angiography was evaluated based on segments and vessels.
Result锛
本文编号:1593745
本文链接:https://www.wllwen.com/yixuelunwen/yundongyixue/1593745.html
最近更新
教材专著