Fully phase-encoded MRI near metallic implants using ultrashort echo times and broadband excitation.
Fully phase-encoded MRI near metallic implants using ultrashort echo times and broadband excitation.
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DOI：
10.1002/mrm.26859
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发表时间：
2018-04
影响因子：
3.3
通讯作者：
Reeder SB
中科院分区：
文献类型：
--
作者：
Wiens CN;Artz NS;Jang H;McMillan AB;Koch KM;Reeder SB
开发一种完全相位编码的 MRI 方法，在临床可行的采集时间内在金属植入物附近进行无失真成像。提出了一种具有宽带激励和超短回波时间的加速 3D 全相位编码采集，它使用宽带射频脉冲来激励由金属植入物引起的整个偏共振。此外，完全相位编码成像用于防止频率编码引起的失真，并获得快速衰减信号的超短回波时间。体模和体内采集用于描述激励带宽、金属植入物附近的信号损失和 T1 加权之间的关系。较短的射频脉冲通过改善频谱覆盖范围并允许更短的回波时间来捕获更靠近植入物的信号，而较长的脉冲通过更大的最大可达到翻转角来改善 T1 权重。在带有金属膝关节和髋关节假体的体模和受试者中，对采用宽带激励和超短回波时间的全相位编码采集与采用可变共振图像组合选择性的 T1 加权多重采集进行了比较。这些采集具有相似的对比度和采集效率。具有超短回波时间和宽带激励的加速全相位编码采集可以在临床可行的采集时间内生成金属植入物附近的无失真图像。磁共振医学 000:000–000, 2017。
To develop a fully phase-encoded MRI method for distortion-free imaging near metallic implants, in clinically feasible acquisition times. An accelerated 3D fully phase-encoded acquisition with broadband excitation and ultrashort echo times is presented, which uses a broadband radiofrequency pulse to excite the entire off-resonance induced by the metallic implant. Furthermore, fully phase-encoded imaging is used to prevent distortions caused by frequency encoding, and to obtain ultrashort echo times for rapidly decaying signal. Phantom and in vivo acquisitions were used to describe the relationship among excitation bandwidth, signal loss near metallic implants, and T1 weighting. Shorter radiofrequency pulses captured signal closer to the implant by improving spectral coverage and allowing shorter echo times, whereas longer pulses improved T1 weighting through larger maximum attainable flip angles. Comparisons of fully phase-encoded acquisition with broadband excitation and ultrashort echo times to T1-weighted multi-acquisition with variable resonance image combination selective were performed in phantoms and subjects with metallic knee and hip prostheses. These acquisitions had similar contrast and acquisition efficiency. Accelerated fully phase-encoded acquisitions with ultrashort echo times and broadband excitation can generate distortion free images near metallic implants in clinically feasible acquisition times. Magn Reson Med 000:000–000, 2017.
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影响因子：
3.3
作者：
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通讯作者：
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影响因子：
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