Teshigawara Mai, Ogura Akio, Uchiyama Naoko, Koganezawa Takumi
School of Radiological Technology, Gunma Prefectural College of Health Science (Current address: Department of Radiology, Maebashi Red Cross Hospital).
Graduate School, Gunma Prefectural College of Health Science.
Nihon Hoshasen Gijutsu Gakkai Zasshi. 2017;73(8):664-671. doi: 10.6009/jjrt.2017_JSRT_73.8.664.
Although fat suppression technique is used in breast MRI, artifacts often appear owing to susceptibility and defective fat suppression effect after breast surgery. This is due to the abundance of adipose tissue in the breast as well as the region of air around the circumference of the excision site. Therefore, we have evaluated the optimal pad material for achieving fat suppression in breast MRI to reduce image artifacts and patient discomfort while maintaining breast shape. Oil of the solidity was used as the breast phantom material after segmental resection surgery. Five pad materials, including rice, ball bullets, glass beads, acrylic beads, and bath salts were used to fill the defects. Fat-suppressed, T-weighted, three-dimensional imaging was performed using a breast array coil. Images with and without the five pad materials, were evaluated physically, visually, and by contact. Physical evaluation consisted of measuring the maximum signal and standard deviation in the regions of interest (ROIs). Discomfort and the amount of perceived resistance were evaluated during contact evaluation by inserting a finger into each pad material. In results, glass beads and bath salts produced a significantly larger fat suppression effect in the ROIs. Visual and contact evaluation also highlighted the benefits of glass beads, the latter demonstrating a significant decrease in discomfort and perceived resistance. In conclusion, we consider glass beads as the optimal pad material for fat suppression in breast MRI after surgery.
尽管脂肪抑制技术应用于乳腺磁共振成像（MRI），但由于乳腺手术术后的敏感性和脂肪抑制效果不佳，伪影经常出现。这是由于乳腺中丰富的脂肪组织以及切除部位周围的空气区域所致。因此，我们评估了在乳腺MRI中实现脂肪抑制的最佳填充材料，以减少图像伪影和患者不适，同时保持乳房形状。节段性切除术后，使用固态油作为乳房模型材料。使用包括大米、子弹球、玻璃珠、丙烯酸珠和浴盐在内的五种填充材料来填充缺损。使用乳腺阵列线圈进行脂肪抑制、T加权三维成像。对有无这五种填充材料的图像进行物理、视觉和触觉评估。物理评估包括测量感兴趣区域（ROI）的最大信号和标准差。通过将手指插入每种填充材料进行触觉评估时，评估不适感和感知阻力的大小。结果显示，玻璃珠和浴盐在ROI中产生了显著更大的脂肪抑制效果。视觉和触觉评估也突出了玻璃珠的优势，触觉评估显示不适感和感知阻力显著降低。总之，我们认为玻璃珠是乳腺手术后MRI脂肪抑制的最佳填充材料。
