Quantitative measurement of mechanical properties of biologic tissues may have several applications for diagnosis or biomechanic modeling in sports medicine, traumatology, or computer-guided surgery. The magnetic resonance imaging (MRI) methods previously tested for these applications all required synchronization between MRI acquisition pulses and the mechanical stimulation. A new unsynchronized method operating with no prior knowledge of intensity, direction, and frequency of the mechanical waves is proposed. A specifically modified SPAMM (SPAtial Modulation of Magnetization) sequence has been used, operating on a 0.2-T MRI system. The experimental results obtained on test objects fit well with theoretical calculations. The new proposed method is very fast (a less than 5-second acquisition time) for routine clinical use.

译文

生物组织机械性能的定量测量可能在运动医学,创伤学或计算机指导手术中的诊断或生物力学建模中有多种应用。先前针对这些应用测试的磁共振成像 (MRI) 方法都需要MRI采集脉冲与机械刺激之间的同步。提出了一种新的非同步方法,该方法无需事先了解机械波的强度,方向和频率。已使用特定修改的SPAMM (磁化的空间调制) 序列,在0.2-T MRI系统上运行。在测试对象上获得的实验结果与理论计算非常吻合。新提出的方法对于常规临床使用非常快 (不到5秒的采集时间)。

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