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首页> 外文期刊>The International Journal of Cardiovascular Imaging >Comparison of image quality of 64-slice multidetector CT coronary CT angiography using automated and manual multiphase methods for the determination of optimal phases for image reconstruction in patients with various mean heart rates
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Comparison of image quality of 64-slice multidetector CT coronary CT angiography using automated and manual multiphase methods for the determination of optimal phases for image reconstruction in patients with various mean heart rates

机译：使用自动和手动多阶段方法对64层多层螺旋CT冠状动脉CT血管成像的图像质量进行比较，以确定不同平均心率患者的图像重建最佳阶段

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摘要

This study aimed to compare the effects of the automated and manual methods for determining the optimal phase of image reconstruction with the use of 64-slice coronary CT angiography (CCTA). In 63 patients, the optimal trigger delay was determined using an automated technique (PhaseXact) and by manual phase selection from the images reconstructed at a 10 ms and 1% increment of the R–R interval. The image quality was evaluated using four-step grading. The mean heart rate in all the patients was 70 ± 10.1 bpm (range: 52–98 bpm). The frequency of obtaining diagnostic quality images was highest with the manual absolute timing method (97.6% of 753 segments), while it was 94.7% with manual relative timing and 91.9% with an automated method. The mean image quality score (1.3 ± 0.2) based on the manual absolute timing was significantly better (P = 0.002, one-way ANOVA; P < 0.05, Scheffe’s test) than the scores determined with the use of the other two techniques (manual relative timing, 1.4 ± 0.3; automated method, 1.5 ± 0.4). The best quality coronary CT images were obtained using image reconstruction with manual absolute timing for the ECG-trigger delay, while an automated method and manual relative timing provided diagnostic quality images in most of the segments.
机译：这项研究旨在比较使用64层冠状动脉CT血管造影（CCTA）的自动和手动方法确定最佳图像重建阶段的效果。在63例患者中，最佳触发延迟是通过自动技术（PhaseXact）以及通过手动选择相位来确定的，这些图像以10 ms且R–R间隔增量为1重建。使用四步分级评估图像质量。所有患者的平均心律为70±10.1 bpm（范围：52–98 bpm）。手动绝对定时方法获得诊断质量图像的频率最高（753个段中的97.6％），手动相对定时方法为94.7％，自动方法为91.9％。基于手动绝对定时的平均图像质量得分（1.3±0.2）明显好于使用其他两种技术（手动）得出的得分（P = 0.002，单向ANOVA； P <0.05，Scheffe检验）相对时间1.4±0.3；自动方法1.5±0.4）。使用具有针对ECG触发延​​迟的手动绝对定时的图像重建，可获得质量最佳的冠状CT图像，而自动化方法和手动相对定时可在大多数段中提供诊断质量的图像。

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