Development ofa new MR compatible biopsy needle without effects of the direction of static magnetic field

开发不受静磁场方向影响的新型 MR 兼容活检针

• 批准号: 12670862
• 负责人: ARAKI Takuji
• 金额: $ 0.77万
• 依托单位: Yamanashi Medical University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (C)
• 财政年份: 2000
• 资助国家: 日本
• 起止时间: 2000 至 2001
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-12670862/
• 关键词: interventional MRI; MR guided biopsy; susceptibility artifact; static magnetic field; 静磁場方向; MRガイド下; 生検針; 磁化率効果

Apparent diameters ofMR compatible needles by susceptibility artifact on MRI are changed for the direction against the direction of static magnetic field. The effect by the direction of static magnetic field will be revised with the changeable susceptibility of needles. The needle is composed of the mandrel and outer column. So the susceptibility effect of the whole needle will be able to be changed by altering the susoeptibility of the mandrel.We madethe mandrelsofNi-Cr-Mo alloy, Ni-Cr alloy and stainless steel alloy, and outer columns of Ni-Cr-Mo with 18 Gage diameter. MRI of each mandrels, outer columns and those combination were obtained with the following sequence ; spin echo (TR/TE 200/17), gradient echo (TR/TE/FA 200/13/25, 200/30/25), fast spoiled gradient echo (TR/TE/FA 180/5.5/90, 180/20/90). In susceptibility effect of the mandrel, that ofstainless steel was the strongest and that of Ni-Crwas the weakest, hi susceptibility effect of the whole needle by combination of the mandrels and the column, the result was the same as the mandrels. When the needle with Ni-Cr mandrel was set up at the perpendicular (90 degree) to the direction ofstatic magnetic field, the apparent diameters of the needle with Ni-Cr-Mo mandrel and stainless steel mandrel should be the same diameters as that of the needle with Ni-Crmandrelatthe angle of 70 degree and 30 degree.We designed a new MR compatible biopsy needle of which an apparent diameter on MRI could be changed.

磁共振兼容针的表观直径在MRI上被磁化率伪影改变为与静磁场方向相反的方向。静磁场方向的影响将随针磁化率的变化而修正。针头由芯轴和外柱组成。因此，通过改变芯轴的磁化率，可以改变整个针的磁化率效应，我们用Ni-Cr-Mo合金、Ni-Cr合金和不锈钢合金制作了芯轴，用Ni-Cr-Mo合金制作了直径为18 G的外柱。采用以下序列获得每个芯轴、外柱及其组合的MRI：自旋回波（TR/TE 200/17）、梯度回波（TR/TE/FA 200/13/25，200/30/25）、快速扰相梯度回波（TR/TE/FA 180/5.5/90，180/20/90）。在芯棒的磁化效应中，不锈钢的磁化效应最强，Ni-Cr的磁化效应最弱。在芯棒与圆柱体组合的整针磁化效应中，结果与芯棒相同。当Ni-Cr芯针垂直于静磁场方向（90 °）时，Ni-Cr-Mo芯针和不锈钢芯针的表观直径应与Ni-Cr芯针在70 °和30 °角时的表观直径相同，我们设计了一种新的MR兼容活检针，其在MRI上的表观直径可以改变。

项目成果

Takuji Araki: "0.2 Tesla open MR guided bone biopsy - fndamental and cclinical evaluation."J Medical Imaging and Information. 33. 1286-1291 (2001)

Takuji Araki：“0.2 Tesla 开放式 MR 引导骨活检 - 基础和临床评估。”J 医学影像与信息。

荒木 拓次: "0.2T open MRガイド下骨生検の基礎的検討と臨床応用"映像情報Medical. 33巻13号. 1286-1291 (2001)

Takuji Araki：“0.2T开放式MR引导骨活检的基础研究和临床应用”图像信息医学，第33卷，第13期。1286-1291（2001）

荒木拓次: "0.2T open MRガイド下骨生検の基礎的検討と臨床応用"映像情報Medical. 33巻・13号. 1286-1291 (2001)

Takuji Araki：“0.2T开放式MR引导骨活检的基础研究和临床应用”图像信息医学，第33卷，第13期。1286-1291（2001）

荒木 拓次: "静磁場の影響に対応した新しいMRガイド下生検針の開発"INNERVISION. 17巻8号(印刷中). (2002)

Takuji Araki：“开发一种可响应静态磁场影响的新型 MR 引导活检针”，INNERVISION，第 17 卷，第 8 期（出版中）。

Takuji Araki: "devekpment of new MR compatible biopsy needle without effect ofdirection ofstatic magnetic field"INNERVISION. 17 (in print). (2002)

Takuji Araki：“开发新型 MR 兼容活检针，不受静磁场方向的影响”INNERVISION。