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首页> 外文期刊>Radiotherapy and oncology: Journal of the European Society for Therapeutic Radiology and Oncology >Three-dimensional movement of a liver tumor detected by high-speed magnetic resonance imaging.
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Three-dimensional movement of a liver tumor detected by high-speed magnetic resonance imaging.

机译：通过高速磁共振成像检测到的肝肿瘤的三维运动。

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OBJECTIVE: Three-dimensional (3D) movement of a spherical liver tumor during respiration was investigated with magnetic resonance imaging (MRI) using a high-speed sequence. METHODS: A marker was placed on the surface of the patient as a reference of distance. Repetition time (TR) was 7.7 ms, echo time (TE) was 4.2 ms, flip angle was 20 degrees, section thickness was 8 mm, and a 256 x 128 matrix was used. The acquisition time was 1.0 s followed by an interval of 0.5 s. The 20 tumor contours extracted during 30 s were superimposed on sagittal and coronal MR images. RESULTS: The maximum value of tumor edge location was 3.9 cm in the cranio-caudal direction, 2.3 cm in the ventro-dorsal direction, and 3.1 cm in the lateral direction. The mean length of tumor displacement observed was 2.1 cm in the cranio-caudal direction, 0.8 cm in the ventro-dorsal and 0.9 cm in the left-right direction, respectively. The locus of the center of the tumor contour in the sagittal cross section was inclined at 23 degrees and in the coronal cross section was inclined at 18 degrees to the cranio-caudal axis of body. CONCLUSION: In conclusion, 3D movement of a spherical liver tumor was detected using rapid MRI sequential examinations. Magnetic resonance imaging has a potential to improve the accuracy of the planning target volume of a liver tumor.
机译：目的：采用高速序列磁共振成像（MRI）研究球形肝肿瘤在呼吸过程中的三维运动（3D）。方法：将标记物放在患者表面作为距离的参考。重复时间（TR）为7.7毫秒，回波时间（TE）为4.2毫秒，翻转角为20度，切片厚度为8毫米，并使用256 x 128矩阵。采集时间为1.0 s，然后间隔0.5 s。在30 s内提取的20个肿瘤轮廓叠加在矢状和冠状MR图像上。结果：肿瘤边缘位置的最大值在颅尾方向为3.9 cm，在腹背方向为2.3 cm，横向为3.1 cm。观察到的肿瘤移位的平均长度在颅尾方向上为2.1 cm，在腹-背方向上为0.8 cm，在左右方向上为0.9 cm。矢状横截面的肿瘤轮廓中心的轨迹相对于人体的头尾轴倾斜了23度，而冠状横截面的中心则相对于颅尾轴倾斜了18度。结论：总之，使用快速MRI连续检查可以检测到球形肝肿瘤的3D运动。磁共振成像具有改善肝肿瘤计划目标体积准确性的潜力。

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