Smiths Interconnect Spring Probe based Pin Grid Arrays (PGAs) for MRI Applications
Spring probes offer high density and have a very high mating cycle life, often higher than traditional pin & socket contact systems, and this is needed to keep very expensive MRI systems operating to their full capacity and patient throughput to a maximum.
MRI (Magnetic Resonance Imaging) systems are used to obtain a clear view of structures inside the body, non-invasively through applying the principle of nuclear magnetic resonance within a powerful magnetic field to image those structures, without the use of potentially harmful X-rays. An RF coil is used as an antenna, around the specific body part to be imaged. It communicates with the RF gradient within the magnetic field. That coil is typically connected to the MRI system with a high-frequency cable and connectors.
Since components comprised of magnetic materials hold the potential to interfere with the image, these coil cables and connectors must be non-magnetic. Additionally, the signal, power, and RF contacts used in these connectors must be highly reliable for tens of thousands of mating cycles. However coaxial RF contacts can be large, costly, and fragile. As such, there is a pressing need for smaller, more robust, and more cost-efficient interconnect systems. Coils are often in direct contact with the patient, so patient comfort is a priority design concern. Wherever it is possible, these coils are made of lightweight materials so that excessive pressure is not applied to the patient being imaged. The size and weight of the cable and connector are also a consideration for the same reason.
Each RF channel in an MRI coil normally requires one coaxial connection and replacing coaxial contacts with a contact grid array can reduce the size, weight, and cost of the connector. However, by replacing pin and socket contacts with spring probes, cleaning the cable connector can be faster and easier since flat target contacts are simpler to clean than coaxial sockets, thus improving throughput in an MRI suite. There may also be the desire to incorporate a connector at the coil end of the cable to facilitate replacing the cable if it becomes damaged, without the need of sending the entire coil out for repair. This dictates the use of a very small connector since it is in even closer proximity to the patient, and connectors that feature an array of contacts make this possible.
Spring Probe PGA Technology
Spring probes have a very high density and mating cycle life, often higher than traditional pin & socket contact systems, and this is needed to keep very expensive MRI systems operating to their full capacity and patient throughput to a maximum. Smiths Interconnect, the leader in spring probe technology, has developed non-magnetic spring probes with mating cycles exceeding 60,000, specifically for MRI applications.
Using a spring probe grid array allows the designer to customize the number of ground pins used to optimize the performance of the connector for specific frequencies/coil designs, saving size, weight, and cost while maintaining the performance of a coax channel where needed. Spring probe grid arrays also simplify cable termination activities by allowing mass solder termination to printed circuit boards.
Comparing the relative size of the PGA and coaxial contact connectors in select applications, the PGA contacts occupy only about ½ the space of traditional coaxial contacts as shown in the examples below for 16 and 32-channel connector pin fields (see Figures 1 & 2)
A typical 16-channel PGA layout, shown in Figure 3 below, incorporates 32 probe contacts, of which 16 are signal and 16 are returns. Each RF channel utilizes 1 signal contact and an adjacent contact for the return:
The analysis of testing commissioned by Smiths Interconnect on pin grid array spring probe connectors shows that this technology is a very viable next step in MRI coil interconnections.
Conclusion
The testing exercise clearly shows that spring probe grid array connectors provide the mechanical, electrical, and optimizable performance required for a typical MRI coil interconnect system, as well as internal connections within the system. This technology provides a non-magnetic interface, reliable mating up to 60,000 cycles, with insertion/return loss, cross talk, and contact resistance levels required by MRI system designers.
- |
- +1 赞 0
- 收藏
- 评论 0
本文由涂抹转载自Smiths Interconnect Blogs,原文标题为:Spring Probe based Pin Grid Arrays (PGAs) for MRI Applications,本站所有转载文章系出于传递更多信息之目的,且明确注明来源,不希望被转载的媒体或个人可与我们联系,我们将立即进行删除处理。
相关推荐
【应用】Exxelia超低ESR高Q陶瓷电容在MRI中的应用,可提高成像分辨率
磁共振成像设备MRI核心指标是图像信噪比,射频线圈作为信号接收链前端,是信噪比的决定因素之一。MRI射频线圈是调谐电路的一部分,因为检测信号极弱,线圈的损耗必须很低,匹配电容也需要低损耗。针对MRI低损耗电容元件需求,Exxelia推出高Q陶瓷电容CHA/CHB系列,具有超低等效串联电阻ESR,超高Q值、高自谐振频率的特性,满足MRI射频线圈低损耗元件需求。
应用方案 发布时间 : 2019-02-22
【应用】Smiths Interconnect弹簧探针用于手术机器人系统,插入力受控可轻松更换工具
Smiths Interconnect了解机器人系统应用痛点,并推荐弹簧探针作为其应用的理想选择。每个一次性仪器都有4个弹簧探针集成到连接端,当需要特定仪器时,这些探针会卡入系统。探针滑到机械臂上的插入目标触点上,来进行所需的电气连接。
应用方案 发布时间 : 2022-02-10
Smiths Interconnect’s Isolator is Connecting with (Potential) Life on Jupiter’s Moons
It was a galactic effort. No surprise, then, at the site’s pride in knowing JUICE’s first transmission was successfully made and received. Nor that the team saved JUICE’s July 2031 date of arrival at Jupiter, after which Smiths Interconnect’s isolator will be helping to relay data that is highly relevant to Earth’s immediate future.
应用方案 发布时间 : 2024-02-28
Smiths Interconnect 0.039"标准弹簧探针选型指南
目录- Standard Spring Probes S series Standard Spring Probes R series Standard Receptacles
型号- R-SS-30-PW,FP-PLUG,R-SS-30-SC,R-SS-30-CR,FPPLUG361,SS-40,R00W390,SS-30,RSS30CR,RSS-30 SERIES,S-00 SERIES,R-00-W-500,S00J1.3G,R-00-W-390,R-00 SERIES,SS-40 SERIES,S-00,SS-30 SERIES,SS40J1.8G,SS-30-B-1.3-G
0.020” & 0.030” Centers Micro Series Spring Probes Board Test Fixture Probes & Receptacles
型号- QUAD-00REC,QUAD-00,QUAD-00B,QUAD-0REC,QUAD-0C-36-1,QUAD-0REC-36-1,QUAD-0 SERIES,QUAD-00 SERIES,QUAD-0REC SERIES,QUAD-0,QUAD-00REC SERIES,QUAD-00REC-36-1
Spring Probes Loose Probe & Connector Solutions
型号- 101111,305330-000,101190,101506,101628,101402-000,100410,100410-005,PI-5327,100891-002,100671,101628-000,101247-001,100671-000,100606-000,101050-003,PI-5329,101712-000,PI-5328,101119-001,101506-000,101190-002,101438-000,101111-008,101712,101679,101438,101119,101050,101294,100804-002,305327-000,305328-000,101050-005,101294-000,PI-5330,305329-000,101367,101247,101402,101602,102197,100891,100803-011,101679-000,101530-000,100803,100606,100804,101530,101367-001,101367-002
TE Connectivity(泰科TE)手持与便携式器件/增值型组件/数据通信架构等产品应用指南(英文)
描述- 新产品应用指南 2019年10月
型号- QSFP56,2118900-1,FCC-360,2342891-2,SFF-TA-1002,MS5840-02BA,SFP56,2318579-1,250 SERIES,MS5837-02BA,EV600,8-2834334-2,T4051420003-001,820M1,AD-101,FX29,T4162224005-005
Kelvin Probes Provide First-Class Performance for High-volume Final Test of Standard Array and Wafer-level Devices
Smiths Interconnect announces the introduction of an innovative spring probe contact technology for Kelvin test of packaged devices down to 0.35mm pitch.
原厂动态 发布时间 : 2021-11-12
A Test Socket Solution Overcomes The Challenges Posed by Traditional Vertical Spring Probes and Cantilever Scrubbing Contact Designs
Advances in semiconductor functionality, density, and chip-level integration are generating new challenges in testing. A test socket solution overcomes the challenges posed by traditional vertical spring probes and cantilever scrubbing contact designs, providing a new level of performance and reliability.
技术探讨 发布时间 : 2024-03-04
Semiconductor Test Sockets: Key to Shipping Quality ICs
Smiths Interconnect is a leading provider of technically differentiated electronic components, subsystems, microwave and RF products that connect, protect and control critical applications in the commercial aviation, defense, space, medical, rail, semiconductor test, wireless telecommunications and industrial markets. The company has 25 sales, R&D and manufacturing locations in 12 countries in the Americas, EMEA and Asia-Pacific.
技术探讨 发布时间 : 2024-05-06
0.050” Centers Standard Spring Probes Board Test Fixture Probes & Receptacles
型号- ICT-50J-T-5.6-DG-S,ICT-50C-T-5.6-DG-S,RT-0,ICT-50C,R-50C-PW-36-1,R-50J-WW-016,R-50C SERIES,R-50J SERIES,R-50C-PW-12-1,R-0-WW-025,R-0-WW-016,R-50C,R-0 SERIES,R-0-SC,ICT-50C-50C SERIES,R-50J-CR,R-50J-WW-025,R-50C-WW-025,S-50C SERIES,ICT-50S-50C SERIES,R-50C-SC,R-50C-CR,S-50C,S-50C-TL-3.7-RT,R-50C-J-DE,RT-50,ICT-50J SERIES,R-50J-PW-36-1,R-50J-PW-12-1,R-50C-J-DE SERIES,SS-50 SERIES,R-50C-WW-016,R-0-CR,CP-50C,R-50J-SC,S-O-A-2.2-G,R-0-PW-36-1,S-0 SERIES,SS-50-A-2.9-G,R-0-PW-12-1,CP-50J
0.100” Centers Standard Spring Probes Board Test Fixture Probes & Receptacles
型号- RSS-100-PW-12-1,ICT-L100-T-5.7-G-S,RSS-100-PW-36-1,R-100-RP,RSS-100-WW-G,R-100-WW-429,ICT-100 SERIES,RSS-100-CR,S-100,RSS-100-NT,R-2 SERIES,R-100-CR,R-2-SC,R-100/SS SERIES,ICT-L100 SERIES,RSS-100-RP,RSS-100,S-2-A-4-G,S-100-T-4-RT,R-100 SERIES,R-100/SS,R-2-RP,ICT-100-T-5.5-G-S,ICT-100,R-100,R-SS/SS SERIES,R-2-WW-429,ICT-L100,R-SS/SS,ICT-100-LF-8-D-S,S-100 SERIES,R-2,R-100-SC,S-2,RSS-100 SERIES,SS-1-3.8-G,R-2-CR,S-2 SERIES,RSS-100-WW
电子商城
品牌:Smiths Interconnect
品类:TEMPERATURE VARIABLE CHIP ATTENUATOR
价格:¥37.0712
现货: 3,100
品牌:Smiths Interconnect
品类:TEMP VARIABLE ATTENUATOR
价格:¥11.5897
现货: 2,677
品牌:Smiths Interconnect
品类:TEMPERATURE VARIABLE ATTENUATOR
价格:¥12.7608
现货: 1,879
登录 | 立即注册
提交评论