Liu H, Martin A J, Truwit C L
Center of Image Guided Therapy, Department of Radiology, University of Minnesota, Minneapolis 55455, USA.
J Magn Reson Imaging. 1998 Jan-Feb;8(1):214-9. doi: 10.1002/jmri.1880080136.
A better understanding of the appearance of a biopsy needle as well as its interaction with various sequence parameters in MRI is beneficial for its application in interventional MRI. As an extension of previous researchers' contributions, we investigate the specific characteristics of MR image artifacts associated with the tip of a biopsy needle when it is approximately parallel to the main magnetic field. The origin of the needle tip artifact, which exhibits as a blooming ball, was studied using MRI techniques and numerical simulation using the finite element method (FEM). Satisfactory agreement between theory and experiment has been achieved. Results showed that the image artifacts associated with biopsy needle are present and dependent on imaging parameters, but the artifacts can be reduced if optimal imaging parameters were used. Images of actual human brain tumor biopsies performed using the same needle under MRI guidance and monitoring demonstrated this artifact.
更好地了解活检针在MRI中的外观及其与各种序列参数的相互作用，有利于其在介入性MRI中的应用。作为对先前研究人员贡献的拓展，我们研究了活检针尖端在大致平行于主磁场时与MR图像伪影相关的具体特征。使用MRI技术和有限元法（FEM）进行数值模拟，研究了表现为光晕球的针尖伪影的起源。理论与实验取得了令人满意的一致性。结果表明，与活检针相关的图像伪影是存在的且依赖于成像参数，但如果使用最佳成像参数，伪影可以减少。在MRI引导和监测下使用同一根针进行的实际人脑肿瘤活检图像证实了这种伪影。
