1.5T MRI磁体零沸腾低温恒温器的机械应力分析

IF 1 4区工程技术 Q4 ENGINEERING, MECHANICAL

Journal of Pressure Vessel Technology-Transactions of the Asme Pub Date : 2022-05-05 DOI:10.1115/1.4054496

N. Suman, A. N. Siddiquee, Sujita Kumar Kar

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引用次数: 0

摘要

全身1.5T超导MRI磁体在4.2K下在零沸腾氦低温容器（即低温恒温器）内运行。低温恒温器具有用作患者孔的850毫米的水平孔。低温恒温器将1.5T超导磁体放置在同轴位置，与梯度线圈保持高度对准，梯度线圈是任何MRI扫描仪所需的鸟笼式RF线圈。一组具有低热导率和更高机械强度的支撑连杆将为4.2K下的冷物质提供结构支撑，该冷物质包括超导磁体、氦容器。两级4.2K G-M低温冷却器用于重新浓缩氦气，以实现“零蒸发”条件。低温恒温器的氦气容器和真空容器在正常运行、运输等过程中会受到应力。ASME B&PV规范和有限元分析已用于低温恒温器的工程设计和应力分析。对低温恒温器在运输过程中进行了模态分析。还对1.5T MRI低温恒温器的低温恒温器的抗震性能进行了广泛分析

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Mechanical Stress Analysis of Zero-Boil-Off Cryostat for a 1.5 T MRI magnet

A whole-body 1.5T superconducting MRI magnet is operated in 4.2K inside a zero-boil-off helium cryogenic vessel i.e. cryostat. The cryostat has horizontal bore of 850 mm used as the patient bore. The cryostat houses the 1.5T superconducting magnet in a coaxial position maintaining a high degree of alignment along with the gradient coil, the birdcage RF coil necessary for any MRI scanner. A set of support link having low thermal conductivity and higher mechanical strength would provide structural support to the cold mass at 4.2K which includes the superconducting magnet, helium vessel. A two stage 4.2K G-M cryocooler is used to recondense helium to achieve a 'zero boil-off' condition. The helium vessel and the vacuum vessel of the cryostat experience stresses during the normal operation, transportation etc. The ASME B&PV Code and the Finite Element Analysis has been used for the engineering design and stress analysis of cryostat. The modal analysis of the cryostat has been done during the transportation of the cryostat. The seismic behaviour of the cryostat has also been analyzed extensively for a 1.5T MRI cryostat

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来源期刊

Journal of Pressure Vessel Technology-Transactions of the Asme 工程技术-工程：机械

CiteScore

2.10

自引率

10.00%

发文量

审稿时长

4.2 months

期刊介绍： The Journal of Pressure Vessel Technology is the premier publication for the highest-quality research and interpretive reports on the design, analysis, materials, fabrication, construction, inspection, operation, and failure prevention of pressure vessels, piping, pipelines, power and heating boilers, heat exchangers, reaction vessels, pumps, valves, and other pressure and temperature-bearing components, as well as the nondestructive evaluation of critical components in mechanical engineering applications. Not only does the Journal cover all topics dealing with the design and analysis of pressure vessels, piping, and components, but it also contains discussions of their related codes and standards. Applicable pressure technology areas of interest include: Dynamic and seismic analysis; Equipment qualification; Fabrication; Welding processes and integrity; Operation of vessels and piping; Fatigue and fracture prediction; Finite and boundary element methods; Fluid-structure interaction; High pressure engineering; Elevated temperature analysis and design; Inelastic analysis; Life extension; Lifeline earthquake engineering; PVP materials and their property databases; NDE; safety and reliability; Verification and qualification of software.