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首页> 外文期刊>IEEE / ASME Transactions on Mechatronics >A 3-DOF MR-Compatible Device for Magic Angle Related In Vivo Experiments
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A 3-DOF MR-Compatible Device for Magic Angle Related In Vivo Experiments

机译：与魔角相关的体内实验的3自由度MR兼容设备

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摘要

The “magic angle” effect consists of the increase in signal intensity observed at a tendon or cartilage in a magnetic resonance image, when the tissue is oriented at an angle of approximately 55 $^circ$ with respect to the main magnetic field $B_{0}$. The exploitation of this phenomenon is often used to assist diagnosis of tendinous and other diseases, although practical difficulties derived from positioning target tissue at the desired orientation inside closed-bore scanners has made this exploitation hard to implement. A 3-DOF MR-compatible mechatronic system has been developed to position a variety of limbs at the magic angle inside a closed-bore scanner, actuated by a custom-developed pneumatic air motor. The system is capable of locating the desired anatomy with high accuracy, and is designed to position the target tissue at a minimal distance from the isocenter. The compatibility of the system is demonstrated, producing negligible artifacts and an insignificant reduction in signal to noise of the image. Preliminary clinical trials scanning the Achilles tendon of healthy volunteers prove the functionality of the device. An increase in signal intensity of up to 21-fold has been recorded in the tendon at the magic angle.
机译：当组织相对于主磁场$ B_ {成大约55°角时，“魔术角”效应包括在磁共振图像中在肌腱或软骨处观察到的信号强度的增加。 0} $。尽管由于将目标组织定位在闭孔扫描仪内的所需方向而引起的实际困难使这种实施难以实施，但这种现象的开发通常用于协助诊断肌腱和其他疾病。已开发出与3自由度MR兼容的机电一体化系统，该系统可通过定制的气动气动马达驱动，以幻角将各种肢体定位在闭孔扫描仪内。该系统能够高精度定位所需的解剖结构，并设计为将目标组织定位在距等中心点最小的距离处。证明了系统的兼容性，产生的伪影可忽略不计，图像信噪比的降低也很小。扫描健康志愿者的跟腱的初步临床试验证明了该装置的功能。在魔角处，肌腱中的信号强度增加了多达21倍。

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