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Improved Reduction of Motion Artifacts in Diffusion Imaging Using Navigator Echoes and Velocity Compensation

机译:使用导航回波和速度补偿改善了扩散成像中运动伪影的减少

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摘要

Navigator echoes provide a means with which to remove motion artifacts from diffusion-weighted images obtained using any multishot imaging technique. However, residual motion artifact is often present in the corrected images rendering the technique unreliable. It is shown that velocity-compensated diffusion sensitization when used in tandem with a navigator echo further reduces the degree of residual motion artifacts present in the corrected images and improves the reliability and clinical utility of the technique. This is demonstrated by applying a method for quantification of motion artifact to brain images of healthy volunteers scanned using both conventional (Stejskal-Tanner) and velocity-compensated gradient sensitization. Other factors affecting the efficacy of the navigator echo technique, such as brain pulsatile motion, gradient b factor, and navigator echo signal-to-noise ratio, are also discussed.
机译:导航回波提供了一种从使用任何多次成像技术获得的扩散加权图像中去除运动伪影的方法。但是,在校正后的图像中经常会出现残留运动伪像,从而使该技术不可靠。结果表明,与导航仪回波配合使用时,速度补偿的扩散敏化可以进一步减少校正图像中残留运动伪影的程度,并提高该技术的可靠性和临床实用性。这通过将定量运动伪影的方法应用于使用常规方法(Stejskal-Tanner)和速度补偿梯度敏化法扫描的健康志愿者的大脑图像来证明。还讨论了影响导航回波技术功效的其他因素,例如大脑搏动运动,梯度b因子和导航回波信噪比。

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