Cardiac and respiratory motion extraction for MRI using pilot tone-a patient study.
Cardiac and respiratory motion extraction for MRI using pilot tone-a patient study.
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使用导频音进行 MRI 心脏和呼吸运动提取 - 一项患者研究。
DOI：
10.1007/s10554-023-02966-z
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发表时间：
2024
期刊：
影响因子：
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通讯作者：
Ahmad,Rizwan
中科院分区：
文献类型：
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作者：
Chen,Chong;Liu,Yingmin;Simonetti,OrlandoP;Tong,Matthew;Jin,Ning;Bacher,Mario;Speier,Peter;Ahmad,Rizwan
本研究旨在评价临床转诊进行心血管MRI的患者中从导频音（PT）中提取的心脏和呼吸信号的准确性和可靠性。23例患者在自由呼吸条件下使用1.5T扫描仪上的平衡稳态自由进动实时（RT）电影序列进行扫描。PT信号由集成在体阵列线圈内的内置PT发射器生成，并进行回顾性处理以提取呼吸和心脏信号。为了进行比较，还同步记录了ECG和BioMatrix（BM）呼吸传感器信号。为了评估PT、ECG和BM的性能，将从RT电影图像中提取的心脏和呼吸信号用作基础事实。在所有病例中，从PT提取的呼吸运动与来自图像的呼吸信号呈正相关，并且显示出比BM（0.72 ± 0.24）更强的相关性（绝对系数：0.95 ± 0.09）。对于心脏信号，PT触发抖动（PT触发位置相对于ECG触发的标准差）范围为6.6 - 83.3 ms，中位数为21.8 ms。23例患者中有21例的PT和相应ECG心动周期持续时间之间的平均绝对差小于平均ECG RR间期的5%。我们没有观察到PT延迟和PT抖动与患者BMI或心动周期持续时间的显著线性依赖性（p > 0.28）。本研究证明了PT监测临床转诊接受心血管MRI的患者的呼吸和心脏运动的潜力。
This study aims to evaluate the accuracy and reliability of the cardiac and respiratory signals extracted from Pilot Tone (PT) in patients clinically referred for cardiovascular MRI. Twenty-three patients were scanned under free-breathing conditions using a balanced steady-state free-precession real-time (RT) cine sequence on a 1.5T scanner. The PT signal was generated by a built-in PT transmitter integrated within the body array coil, and retrospectively processed to extract respiratory and cardiac signals. For comparison, ECG and BioMatrix (BM) respiratory sensor signals were also synchronously recorded. To assess the performances of PT, ECG, and BM, cardiac and respiratory signals extracted from the RT cine images were used as the ground truth. The respiratory motion extracted from PT correlated positively with the image-derived respiratory signal in all cases and showed a stronger correlation (absolute coefficient: 0.95 ± 0.09) than BM (0.72 ± 0.24). For the cardiac signal, PT trigger jitter (standard deviation of PT trigger locations relative to ECG triggers) ranged from 6.6 to 83.3 ms, with a median of 21.8 ms. The mean absolute difference between the PT and corresponding ECG cardiac cycle duration was less than 5% of the average ECG RR interval for 21 out of 23 patients. We did not observe a significant linear dependence (p > 0.28) of PT delay and PT jitter on the patients’ BMI or cardiac cycle duration. This study demonstrates the potential of PT to monitor both respiratory and cardiac motion in patients clinically referred for cardiovascular MRI.