Evaluation of actuation compatibility and homogeneities for MRI-powered ferromagnetic sphere

IF 1.5 4区医学 Q3 SURGERY

Computer Assisted Surgery Pub Date : 2016-12-16 DOI:10.1080/24699322.2016.1240312

Peng Zhang, Wendong Wang, Yikai Shi, Xiaoqing Yuan

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引用次数: 2

Abstract

Abstract MR-compatibility actuations have been widely investigated for the development of robot-assisted devices under the magnetic resonance imaging (MRI). Ferromagnetic components of MRI-powered can be manipulated remotely using the magnetic force or torque induced by MRI or magnetic field environment. However, (1) numerical analysis of the related factors, geometry and magnitude, influencing the ferromagnetic components, and (2) field non-homogeneities when placed in a uniform main magnetic field B0 are rarely reported. To address the relationship between magnetic force/torque and parameters, different radii of ferromagnetic spheres are required to exert magnetic force and torque with variable magnetic field. Comparison of the field homogeneities error (FHE) under various locations and parameters was investigated. In this study, we present the equivalent model of magnetic field and compare the magnetic force and torque of ferromagnetic sphere under different conditions and provide a safety distance of drive source (ferromagnetic sphere). The numerical models between parameters are established and significant factors were analyzed. Through various parameters of the ferromagnetic sphere, the performance of the numerical model in the magnetic field was evaluated. Cubic polynomial equations were developed to relate magnetic properties of ferromagnetic sphere with R2 > 0.9506. Field homogeneity was not significantly affected when actuation source was installed in 32 cm away from the isocenter.

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核磁共振驱动铁磁球的驱动兼容性和均匀性评价

摘要磁共振成像(MRI)下的机器人辅助装置开发中，核磁共振兼容驱动已被广泛研究。MRI驱动的铁磁元件可以利用MRI或磁场环境产生的磁力或扭矩进行远程操作。然而，(1)对影响铁磁分量的相关因素、几何形状和大小的数值分析，以及(2)置于均匀主磁场B0时的磁场非均匀性很少有报道。为了解决磁力/转矩与参数之间的关系，在变磁场条件下，要求不同半径的铁磁球施加磁力和转矩。比较了不同位置和参数下的场均质误差(FHE)。本文建立了磁场等效模型，比较了不同条件下铁磁球的磁力和转矩，并给出了驱动源(铁磁球)的安全距离。建立了参数间的数值模型，并对影响因素进行了分析。通过铁磁球的各种参数，对数值模型在磁场中的性能进行了评价。建立了与R2 > 0.9506有关的铁磁球磁性能的三次多项式方程。当驱动源安装在距离等心32 cm处时，对磁场均匀性影响不显著。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Computer Assisted Surgery Medicine-Surgery

CiteScore

2.30

自引率

0.00%

发文量

审稿时长

10 weeks

期刊介绍： omputer Assisted Surgery aims to improve patient care by advancing the utilization of computers during treatment; to evaluate the benefits and risks associated with the integration of advanced digital technologies into surgical practice; to disseminate clinical and basic research relevant to stereotactic surgery, minimal access surgery, endoscopy, and surgical robotics; to encourage interdisciplinary collaboration between engineers and physicians in developing new concepts and applications; to educate clinicians about the principles and techniques of computer assisted surgery and therapeutics; and to serve the international scientific community as a medium for the transfer of new information relating to theory, research, and practice in biomedical imaging and the surgical specialties. The scope of Computer Assisted Surgery encompasses all fields within surgery, as well as biomedical imaging and instrumentation, and digital technology employed as an adjunct to imaging in diagnosis, therapeutics, and surgery. Topics featured include frameless as well as conventional stereotactic procedures, surgery guided by intraoperative ultrasound or magnetic resonance imaging, image guided focused irradiation, robotic surgery, and any therapeutic interventions performed with the use of digital imaging technology.