Effect of RR interval variation on image quality in gated, two-dimensional, Fourier MR imaging.
Effect of RR interval variation on image quality in gated, two-dimensional, Fourier MR imaging.
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RR 间隔变化对门控二维傅里叶 MR 成像中图像质量的影响。
DOI：
10.1148/radiology.186.3.8430202
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发表时间：
1993
期刊：
影响因子：
19.7
通讯作者：
Shapiro,EP
中科院分区：
文献类型：
--
作者：
RogersJr,WJ;Shapiro,EP
研究了门控二维傅立叶磁共振图像采集过程中重复时间间隔不均匀对伪影产生的影响，并提出了一种补偿方法。在标准自旋回波成像中，不完全纵向恢复与正常呼吸心率变化相结合，以调制信号强度并创建图像副本和沿相位方向的沿着拖尾。已发现调制幅度、频率和模式以及机器参数（包括回波时间、TR、视野和图像矩阵大小）对伪影位置和强度具有实质性影响。在一组10名健康志愿者中，麻醉诱导的心率调节在原始数据信号中产生平均17.2% +/- 4.9的变化，平均频率为0.36 Hz +/- 0.06。本研究的结果表明，在成像周期内由心率变化引起的图像伪影是可预测的，并且可以通过在二维傅立叶变换之前校正每个相位视图的信号强度来减少。
The effect of uneven repetition time (TR) intervals on artifact production during gated two-dimensional Fourier magnetic resonance image acquisition was investigated and a means of compensation presented. In standard spin-echo imaging, incomplete longitudinal recovery combines with normal respiratory heart rate variations to modulate signal intensity and create image copies and smearing along the phase direction. Modulation amplitude, frequency, and pattern, as well as machine parameters including echo time, TR, field of view, and image matrix size, have been found to have a substantial impact on artifact position and intensity. In a group of 10 healthy volunteers, respiratory-induced heart rate modulation produced an average of 17.2% +/- 4.9 variation in the raw data signal, with a mean frequency of 0.36 Hz +/- 0.06. The results of this study indicate that image artifacts caused by heart rate variations within the imaging period are predictable and may be reduced by correcting signal intensity for each phase view before two-dimensional Fourier transformation.