Department of Radiological Technology, Nagoya University Hospital, 65 Tsurumai-cho, Shouwa-ku, Nagoya, Aichi, 466-8560, Japan.
Department of Radiology, Nagoya University Graduate School of Medicine, 65 Tsurumai-cho, Shouwa-ku, Nagoya, Aichi, 466-8560, Japan.
Radiol Phys Technol. 2023 Dec;16(4):578-583. doi: 10.1007/s12194-023-00745-y. Epub 2023 Oct 6.
This study presents two cases of tumors in contact with the inferior vena cava during radiotherapy, and introduces a clinically useful technique for identifying tumor boundaries adjacent to blood vessels by adjusting the position of the field-of-view (FOV) to enhance the inflow effect in magnetic resonance imaging. We named this technique "Shifting-FOV." This method consists of three steps: (1) remove the upper and lower saturation pulses outside the FOV, (2) align the FOV to position the lower edge of the imaging slab as close to the tumor as possible, and (3) manually adjust the table position to locate the tumor at the center of the magnetic field. The proposed method allowed for accurate identification of the tumor/vessel boundaries in both cases. This is a useful technique that can be readily applied to other facilities. Furthermore, images obtained using this technique may enable accurate tumor contouring in radiotherapy treatment planning.
本研究介绍了两例放疗中与下腔静脉接触的肿瘤病例，并介绍了一种通过调整视野（FOV）位置来增强磁共振成像中流入效应，从而识别血管旁肿瘤边界的临床实用技术。我们将该技术命名为“移位-FOV”。该方法包括三个步骤：（1）去除 FOV 之外的上下饱和脉冲；（2）对齐 FOV，使成像板的下边缘尽可能靠近肿瘤；（3）手动调整台位置，使肿瘤位于磁场中心。在这两种情况下，所提出的方法都能准确识别肿瘤/血管边界。这是一种有用的技术，可在其他设备上轻松应用。此外，该技术获得的图像可能使肿瘤轮廓勾画在放疗计划中更准确。
