[{"data":1,"prerenderedAt":-1},["ShallowReactive",2],{"doc-detail-85166-en":3,"doc-seo-85166-105":29,"detail-sidebar-cat-0-en-105":82},{"code":4,"msg":5,"data":6},0,"success",{"doc_id":7,"user_id":8,"nickname":9,"user_avatar":10,"doc_module":4,"category_id":11,"category_name":12,"doc_title":13,"doc_description":14,"doc_content":15,"file_id":16,"file_url":17,"file_type":18,"file_size":19,"view_count":4,"is_deleted":4,"is_public":20,"is_downloadable":20,"audit_status":20,"page_count":21,"language":22,"language_code":23,"site_id":24,"html_lang":23,"table_of_contents":25,"faqs":26,"seo_title":13,"seo_description":14,"update_tm":27,"read_time":28},85166,962075114765,"Quinn","https://ap-avatar.wpscdn.com/davatar_a8503ba1806abce46bf441b54a3ca4cd",7,"Healthcare","Optically-Powered Low Power Low Noise Amplifiers for MRI","Fully optical receive coil arrays for MRI promise dense multichannel operation, reduced crosstalk, and less cable clutter, but conventional low-noise amplifiers draw power too high for optical power delivery. The work develops low-power low-noise LNAs (LPLNA) that reduce consumption while preserving noise figure and gain. A two-stage cascaded LPLNA uses an MR-compatible E-pHEMT transistor on a single-sided PCB. Phantom and in vivo results show comparable SNR and improved interchannel noise correlation.","Optically-powered Low Power Low Noise Amplifiers for MRI  \nReza Aghabagheri 1 *, Jakob Gerlach 1, Zining Liu 1, Morteza Teymoori2,Çağlar Ataman2, Michael Bock 1, Ali Caglar Özen 1  \n1Division of Medical Physics, Department of Diagnostic and Interventional Radiology, Medical Center – University of Freiburg, Faculty of Medicine – University of Freiburg, Freiburg, Germany  \n2Microsystems for Biomedical Imaging Group, Department of Microsystems Engineering, University of Freiburg, Freiburg, Germany  \n2798/2800 Words  \n*Correspondence: Reza Aghabagheri  \nDivision of Medical Physics, Department of Diagnostic and Interventional Radiology, Medical Center – University of Freiburg, Faculty of Medicine – University of Freiburg, Freiburg, Germany.  \nEmail: [Reza.aghabagheri@uniklinik-freiburg.de](Reza.aghabagheri@uniklinik-freiburg.de)  \nABSTRACT  \nPurpose: Fully optical receive coils can potentially allow dense receiver arrays with a large channel count, reduced channel crosstalk, and less cable clutter. The power requirements of conventional lownoise amplifiers (LNAs) are prohibitive for simultaneously driving many coils through optical means, as opto-electric power conversion efficiencies can only reach about 50% . The goal is to develop lowpower LNAs (LPLNA) with substantially lower power consumption without compromising noise figure (NF) and gain.  \nMethods: A LPLNA was designed as a two-stage cascaded amplifier using an MR-compatible E-pHEMT (Enhancement-mode Pseudomorphic High Electron Mobility Transistor) transistor. The design was implemented on a single-sided printed circuit board (PCB), and its performance was compared with a commercial LNA. A four-channel shielded loop resonator array was constructed, and the signal-tonoise ratio (SNR), noise covariance, and preamplifier decoupling performance were evaluated.  \nResults: The LPLNA had a five-fold lower electrical power consumption (40 mW) than the commercial LNA and provided comparable SNR in phantom measurements. In vivo experiments further confirmed that the LPLNA operates reliably under realistic MRI conditions. Additionally, four-channel receiver array measurements demonstrated comparable SNR within 2% of the commercial LNA and lower interchannel noise correlation with 0.26 vs 0.3 on average.  \nConclusion: This study demonstrates the feasibility of LPLNAs for optically-powered RF receiver coil arrays. The LPLNA could also be applied in power-constrained or remote MRI environments.  \nKeywords: LNA, low noise amplifier, preamplifier, optical signal and power transmission, LightCoils  \nWord count: 233  \nINTRODUCTION  \nIn conventional MRI receive coils the induced signal is inherently weak and must be amplified before it is transferred to the subsequent receiver electronics. For this reason, a preamplifier circuit with a low noise figure (NF) is placed close to each coil element 1. This low noise amplifier (LNA) increases the signal level, but it should add only minimal additional noise to preserve the signal to noise ratio (SNR) . Various LNA designs have been introduced in research settings for MRI applications, with reported gain values ranging from 18 to 32 dB and NF down to sub-1 dB levels, often achieved using EpHEMT(Enhancement-mode Pseudomorphic High Electron Mobility Transistor)-based architecturesand, in some cases, cryogenic operation to further enhance SNR 2,3, 4. In multi-channel MRI receive arrays, low-or high-input-impedance LNAs can also be used to decouple the coil elements 5–7, which is essential for parallel imaging performance 8. A range of commercial LNAs are also available for MRI applications including but not limited to 9–12 , they typically provide a gain of 20-28 dB with typical NF values around 0.5 dB. Most MRI preamplifiers operate at supply voltages of 5 V or 10 V, with a driving current of 20 to 50 mA. Electrical power to the LNAs is typically supplied through the MRI system interface via a galvanic connection to an external power source. Therefore","cbCaihOBwrwTcpTY","https://ap.wps.com/l/cbCaihOBwrwTcpTY","pdf",1979881,1,19,"English","en",105,"# Abstract\n# Introduction\n# Methods\n## LPLNA Design","[{\"question\":\"What performance improvements are reported for the LPLNA compared with a commercial LNA?\",\"answer\":\"The LPLNA achieves about five-fold lower electrical power consumption (40 mW) while providing comparable SNR in phantom measurements. In four-channel receiver array tests, it shows similar SNR within 2% and lower average interchannel noise correlation (0.26 vs 0.3).\"}]",1784201495,48,{"code":4,"msg":30,"data":31},"ok",{"site_id":24,"language":23,"slug":32,"title":13,"keywords":33,"description":14,"schema_data":34,"social_meta":77,"head_meta":79,"extra_data":81,"updated_unix":27},"optically-powered-low-power-low-noise-amplifiers-for-mri","",{"@graph":35,"@context":76},[36,53,67],{"@type":37,"itemListElement":38},"BreadcrumbList",[39,43,47,50],{"item":40,"name":41,"@type":42,"position":20},"https://docshare.wps.com","Home","ListItem",{"item":44,"name":45,"@type":42,"position":46},"https://docshare.wps.com/document/","Document",2,{"item":48,"name":12,"@type":42,"position":49},"https://docshare.wps.com/document/healthcare/",3,{"item":51,"name":13,"@type":42,"position":52},"https://docshare.wps.com/document/optically-powered-low-power-low-noise-amplifiers-for-mri/85166/",4,{"url":51,"name":13,"@type":54,"author":55,"headline":13,"publisher":57,"fileFormat":60,"inLanguage":23,"description":14,"dateModified":61,"datePublished":61,"encodingFormat":60,"isAccessibleForFree":62,"interactionStatistic":63},"DigitalDocument",{"name":9,"@type":56},"Person",{"url":40,"name":58,"@type":59},"DocShare","Organization","application/pdf","2026-07-16",true,{"@type":64,"interactionType":65,"userInteractionCount":4},"InteractionCounter",{"@type":66},"ViewAction",{"@type":68,"mainEntity":69},"FAQPage",[70],{"name":71,"@type":72,"acceptedAnswer":73},"What performance improvements are reported for the LPLNA compared with a commercial LNA?","Question",{"text":74,"@type":75},"The LPLNA achieves about five-fold lower electrical power consumption (40 mW) while providing comparable SNR in phantom measurements. In four-channel receiver array tests, it shows similar SNR within 2% and lower average interchannel noise correlation (0.26 vs 0.3).","Answer","https://schema.org",{"og:url":51,"og:type":78,"og:title":13,"og:site_name":58,"og:description":14},"article",{"robots":80,"canonical":51},"index,follow",{"doc_id":7,"site_id":24},{"code":4,"msg":5,"data":83},[84,88,92,96,101,106,109,114,119,122,126],{"id":20,"doc_module":4,"doc_module_name":45,"category_name":85,"show_sort_weight":86,"slug":87},"Story & Novel",90,"story-novel",{"id":46,"doc_module":4,"doc_module_name":45,"category_name":89,"show_sort_weight":90,"slug":91},"Literature",80,"literature",{"id":52,"doc_module":4,"doc_module_name":45,"category_name":93,"show_sort_weight":94,"slug":95},"Exam",70,"exam",{"id":97,"doc_module":4,"doc_module_name":45,"category_name":98,"show_sort_weight":99,"slug":100},5,"Comic",60,"comic",{"id":102,"doc_module":4,"doc_module_name":45,"category_name":103,"show_sort_weight":104,"slug":105},6,"Technology",50,"technology",{"id":11,"doc_module":4,"doc_module_name":45,"category_name":12,"show_sort_weight":107,"slug":108},40,"healthcare",{"id":110,"doc_module":4,"doc_module_name":45,"category_name":111,"show_sort_weight":112,"slug":113},8,"Research & Report",30,"research-report",{"id":115,"doc_module":4,"doc_module_name":45,"category_name":116,"show_sort_weight":117,"slug":118},9,"Religion & Spirituality",20,"religion-spirituality",{"id":117,"doc_module":4,"doc_module_name":45,"category_name":120,"show_sort_weight":117,"slug":121},"World Cup","world-cup",{"id":123,"doc_module":4,"doc_module_name":45,"category_name":124,"show_sort_weight":123,"slug":125},10,"Lifestyle","lifestyle",{"id":21,"doc_module":4,"doc_module_name":45,"category_name":127,"show_sort_weight":97,"slug":128},"General","general"]