Whitehead Gregory, Ji Jim
Department of Electrical and Computer Engineering at Texas A&M University, College Station, TX 77843, USA.
Annu Int Conf IEEE Eng Med Biol Soc. 2010;2010:6641-4. doi: 10.1109/IEMBS.2010.5627151.
MRI provides a safe, high-resolution imaging modality that can be used to assist physicians during intra-operative and post-operative phases of prostate brachytherapy. The metallic outer structure of brachytherapy seeds, however, naturally produces dark features in MR imagery, which can be confused with other image voids. This work explores the application of resonant frequency offset maps to predict the shift in resonant frequency that occurs in the vicinity of a metallic cylindrical seed-like object. An off-resonance imaging approach is then proposed to generate positive contrast markers that may aid in automatic unambiguous detection and localization of brachytherapy seeds in MR imagery.
磁共振成像（MRI）提供了一种安全的高分辨率成像方式，可用于在前列腺近距离放射治疗的术中及术后阶段协助医生。然而，近距离放射治疗种子源的金属外部结构在磁共振图像中自然会产生暗区特征，这可能会与其他图像空洞相混淆。这项工作探索了共振频率偏移图的应用，以预测在金属圆柱形种子状物体附近发生的共振频率偏移。然后提出了一种非共振成像方法，以生成阳性对比标记，这可能有助于在磁共振图像中自动明确地检测和定位近距离放射治疗种子源。
