Pub Date : 2013-12-01DOI: 10.1109/IMWS-BIO.2013.6756145
T. Niendorf
This work focuses on explorations into human magnetic resonance (MR) at ultrahigh magnetic fields (B0≥7.0 Tesla, f≥298 MHz). Current trends in enabling multi-channel radiofrequency (RF) technology tailored for MR in the low wavelength regime are presented with the ultimate goal to attain clinically acceptable image quality. Validation of RF coil performance, mapping and shimming of transmission fields together with RF power deposition considerations are presented. Early applications of cardiovascular MR at 7.0 T are provided and their clinical implications are discussed. A concluding section ventures a glance beyond the horizon and explores future directions of RF coil developments.
{"title":"Multi-channel transmit/receive RF coil arrays for cardiac MRI at ultrahigh fields: Design, validation and clinical application","authors":"T. Niendorf","doi":"10.1109/IMWS-BIO.2013.6756145","DOIUrl":"https://doi.org/10.1109/IMWS-BIO.2013.6756145","url":null,"abstract":"This work focuses on explorations into human magnetic resonance (MR) at ultrahigh magnetic fields (B0≥7.0 Tesla, f≥298 MHz). Current trends in enabling multi-channel radiofrequency (RF) technology tailored for MR in the low wavelength regime are presented with the ultimate goal to attain clinically acceptable image quality. Validation of RF coil performance, mapping and shimming of transmission fields together with RF power deposition considerations are presented. Early applications of cardiovascular MR at 7.0 T are provided and their clinical implications are discussed. A concluding section ventures a glance beyond the horizon and explores future directions of RF coil developments.","PeriodicalId":6321,"journal":{"name":"2013 IEEE MTT-S International Microwave Workshop Series on RF and Wireless Technologies for Biomedical and Healthcare Applications (IMWS-BIO)","volume":"11 1","pages":"1-3"},"PeriodicalIF":0.0,"publicationDate":"2013-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"87632122","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2013-12-01DOI: 10.1109/IMWS-BIO.2013.6756168
Feng Xiaohua, Gao Fei, Zheng Yuanjin
Magnetically mediated thermoacoustic imaging exploits the electromagnetic spectrum of radio frequency magnetic field under 20 MHz to perform thermoacoustic imaging, which can provide deeper penetration than microwave or light irradiation. To achieve effective imaging, current implementation relies on magnetic resonance of the coil to deliver sufficiently strong magnetic field into conductive objects, including tissues. Different kind of coils can be utilized, which affects both the magnetic field distribution and the design of the resonance circuits. We investigated here those various coils and their implications for the imaging system. Preliminary thermoacoustic signal generation and imaging results are also presented.
{"title":"Magnetically mediated thermoacoustic imaging and technical considerations on its coil design","authors":"Feng Xiaohua, Gao Fei, Zheng Yuanjin","doi":"10.1109/IMWS-BIO.2013.6756168","DOIUrl":"https://doi.org/10.1109/IMWS-BIO.2013.6756168","url":null,"abstract":"Magnetically mediated thermoacoustic imaging exploits the electromagnetic spectrum of radio frequency magnetic field under 20 MHz to perform thermoacoustic imaging, which can provide deeper penetration than microwave or light irradiation. To achieve effective imaging, current implementation relies on magnetic resonance of the coil to deliver sufficiently strong magnetic field into conductive objects, including tissues. Different kind of coils can be utilized, which affects both the magnetic field distribution and the design of the resonance circuits. We investigated here those various coils and their implications for the imaging system. Preliminary thermoacoustic signal generation and imaging results are also presented.","PeriodicalId":6321,"journal":{"name":"2013 IEEE MTT-S International Microwave Workshop Series on RF and Wireless Technologies for Biomedical and Healthcare Applications (IMWS-BIO)","volume":"6 1","pages":"1-3"},"PeriodicalIF":0.0,"publicationDate":"2013-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90402842","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2013-12-01DOI: 10.1109/IMWS-BIO.2013.6756197
Linsheng Wu, J. Sakai, Hucheng Sun, Yong-xin Guo
The method of conjugate-image impedance is used to design the matching network for the capacitive intra-body communication channel. Narrow passbands around 20 MHz are observed in the measured responses of the matched cases, where the transmission levels are about 20 dB higher than the unmatched ones. The method versatility is also validated.
{"title":"Matching network to improve the transmission level of capacitive intra-body communication (IBC) channels","authors":"Linsheng Wu, J. Sakai, Hucheng Sun, Yong-xin Guo","doi":"10.1109/IMWS-BIO.2013.6756197","DOIUrl":"https://doi.org/10.1109/IMWS-BIO.2013.6756197","url":null,"abstract":"The method of conjugate-image impedance is used to design the matching network for the capacitive intra-body communication channel. Narrow passbands around 20 MHz are observed in the measured responses of the matched cases, where the transmission levels are about 20 dB higher than the unmatched ones. The method versatility is also validated.","PeriodicalId":6321,"journal":{"name":"2013 IEEE MTT-S International Microwave Workshop Series on RF and Wireless Technologies for Biomedical and Healthcare Applications (IMWS-BIO)","volume":"131 1","pages":"1-3"},"PeriodicalIF":0.0,"publicationDate":"2013-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85617394","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2013-12-01DOI: 10.1109/IMWS-BIO.2013.6756170
Mengxi Wang, Guohui Yang, Wan-lu Li, Qun Wu
Cancer claimed the death of over 7.6 million people each year all over the world. Many attempts have being practiced in clinical applications, yet some new technologies are believed to make up for the shortcomings of existing methods. Some latest advances have aroused interests in terahertz imaging and the biological effect as promising diagnostic methods for cancer. This review, however, taps into the biological effects of terahertz radiation as well as the possible mechanism to reveal the potentials and prospects of THz in cancer treatment.
{"title":"An overview of cancer treatment by terahertz radiation","authors":"Mengxi Wang, Guohui Yang, Wan-lu Li, Qun Wu","doi":"10.1109/IMWS-BIO.2013.6756170","DOIUrl":"https://doi.org/10.1109/IMWS-BIO.2013.6756170","url":null,"abstract":"Cancer claimed the death of over 7.6 million people each year all over the world. Many attempts have being practiced in clinical applications, yet some new technologies are believed to make up for the shortcomings of existing methods. Some latest advances have aroused interests in terahertz imaging and the biological effect as promising diagnostic methods for cancer. This review, however, taps into the biological effects of terahertz radiation as well as the possible mechanism to reveal the potentials and prospects of THz in cancer treatment.","PeriodicalId":6321,"journal":{"name":"2013 IEEE MTT-S International Microwave Workshop Series on RF and Wireless Technologies for Biomedical and Healthcare Applications (IMWS-BIO)","volume":"121 4 1","pages":"1-3"},"PeriodicalIF":0.0,"publicationDate":"2013-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"88766595","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2013-12-01DOI: 10.1109/IMWS-BIO.2013.6756173
M. Kozlov, R. Turner
We numerically investigated several magnetic resonance imaging radiofrequency transmit coil arrays, with and without a local shield, and with a range of scanner bore configurations. The latter had a significant influence on safety excitation efficiency. It is therefore important to include the scanner magnet room in the simulation domain, when the scanner bore is not isolated from the rest of the scan room by an electric shield or RF absorber. All arrays investigated provided similar inhomogeneity over the entire brain for a given excitation condition. However, for CP excitation mode transmit excitation efficiency was found to be higher for an array without a local shield.
{"title":"Optimization of geometry for a dual-row MRI array at 400 MHz","authors":"M. Kozlov, R. Turner","doi":"10.1109/IMWS-BIO.2013.6756173","DOIUrl":"https://doi.org/10.1109/IMWS-BIO.2013.6756173","url":null,"abstract":"We numerically investigated several magnetic resonance imaging radiofrequency transmit coil arrays, with and without a local shield, and with a range of scanner bore configurations. The latter had a significant influence on safety excitation efficiency. It is therefore important to include the scanner magnet room in the simulation domain, when the scanner bore is not isolated from the rest of the scan room by an electric shield or RF absorber. All arrays investigated provided similar inhomogeneity over the entire brain for a given excitation condition. However, for CP excitation mode transmit excitation efficiency was found to be higher for an array without a local shield.","PeriodicalId":6321,"journal":{"name":"2013 IEEE MTT-S International Microwave Workshop Series on RF and Wireless Technologies for Biomedical and Healthcare Applications (IMWS-BIO)","volume":"66 1","pages":"1-3"},"PeriodicalIF":0.0,"publicationDate":"2013-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89688907","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2013-12-01DOI: 10.1109/IMWS-BIO.2013.6756207
C. Gong, Kai-Wen Yao, Chih-Hung Wang, K. Wang, M. Shiue, Chih-Cheng Chris Lu, Yi-Feng Luo
This paper presents study for rapid prototyping of a low-frequency implantable transceiver system. The idea stems from behavior modeling, followed by circuit design phase, for electronic implant requiring wireless transmission.
{"title":"An inductive biomedical communication processing chain","authors":"C. Gong, Kai-Wen Yao, Chih-Hung Wang, K. Wang, M. Shiue, Chih-Cheng Chris Lu, Yi-Feng Luo","doi":"10.1109/IMWS-BIO.2013.6756207","DOIUrl":"https://doi.org/10.1109/IMWS-BIO.2013.6756207","url":null,"abstract":"This paper presents study for rapid prototyping of a low-frequency implantable transceiver system. The idea stems from behavior modeling, followed by circuit design phase, for electronic implant requiring wireless transmission.","PeriodicalId":6321,"journal":{"name":"2013 IEEE MTT-S International Microwave Workshop Series on RF and Wireless Technologies for Biomedical and Healthcare Applications (IMWS-BIO)","volume":"22 1","pages":"1-3"},"PeriodicalIF":0.0,"publicationDate":"2013-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"88317953","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2013-12-01DOI: 10.1109/IMWS-BIO.2013.6756231
M. Persson, A. Fhager, H. Trefná, P. Takook, Yinan Yu, T. McKelvey, J. Karlsson, X. Zeng, H. Zirath, M. Elam
Globally, around 15 million people each year suffer a stroke. Only a small fraction of stroke patients who could benefit from thrombolytic treatment reach diagnosis and treatment in time. To increase this low figure we have developed microwave technology aiming to differentiate hemorrhagic from ischemic stroke patients. The standard method for breast cancer diagnosis today is X-ray mammography. Despite its recognized ability to detect tumors it suffers from some limitations. Neither the false positive nor the false negative detection rates are negligible. An interesting alternative being researched extensively today is microwave tomography. In our current strive to develop a clinical prototype we have found that the most suitable design consists of an antenna array placed in a full 3D pattern. During the last decade clinical studies have demonstrated the ability of microwave hyperthermia to dramatically enhance cancer patient survival. The fundamental challenge is to adequately heat deep-seated tumors while preventing surrounding healthy tissue from undesired heating and damage. We are specifically addressing the challenge to deliver power levels with spatial control, patient treatment planning, and noninvasive temperature measurements.
{"title":"Microwave based diagnostics and treatment in practice","authors":"M. Persson, A. Fhager, H. Trefná, P. Takook, Yinan Yu, T. McKelvey, J. Karlsson, X. Zeng, H. Zirath, M. Elam","doi":"10.1109/IMWS-BIO.2013.6756231","DOIUrl":"https://doi.org/10.1109/IMWS-BIO.2013.6756231","url":null,"abstract":"Globally, around 15 million people each year suffer a stroke. Only a small fraction of stroke patients who could benefit from thrombolytic treatment reach diagnosis and treatment in time. To increase this low figure we have developed microwave technology aiming to differentiate hemorrhagic from ischemic stroke patients. The standard method for breast cancer diagnosis today is X-ray mammography. Despite its recognized ability to detect tumors it suffers from some limitations. Neither the false positive nor the false negative detection rates are negligible. An interesting alternative being researched extensively today is microwave tomography. In our current strive to develop a clinical prototype we have found that the most suitable design consists of an antenna array placed in a full 3D pattern. During the last decade clinical studies have demonstrated the ability of microwave hyperthermia to dramatically enhance cancer patient survival. The fundamental challenge is to adequately heat deep-seated tumors while preventing surrounding healthy tissue from undesired heating and damage. We are specifically addressing the challenge to deliver power levels with spatial control, patient treatment planning, and noninvasive temperature measurements.","PeriodicalId":6321,"journal":{"name":"2013 IEEE MTT-S International Microwave Workshop Series on RF and Wireless Technologies for Biomedical and Healthcare Applications (IMWS-BIO)","volume":"5 1","pages":"1-3"},"PeriodicalIF":0.0,"publicationDate":"2013-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86820964","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2013-12-01DOI: 10.1109/IMWS-BIO.2013.6756141
Yin Li, Sheng Sun
In this paper, the wireless power transfer system based on magnetic-coupled resonators is modeled and optimized by using low-frequency integral equation solver. For the low-frequency transfer system, the mesh size after discretization is usually much smaller than the wavelength. Hence, the low-frequency solvers are proposed to model this kind of structures with tiny meshes. After the spiral resonators are determined at specific frequency, we only need to optimize the distance between resonators and two loops. The numerical results show that we are no need to re-mesh the whole transfer system during the distance searching procedure, and the optimized distance can be easily obtained.
{"title":"Efficient low-frequency integral equation solver for wireless power transfer modeling","authors":"Yin Li, Sheng Sun","doi":"10.1109/IMWS-BIO.2013.6756141","DOIUrl":"https://doi.org/10.1109/IMWS-BIO.2013.6756141","url":null,"abstract":"In this paper, the wireless power transfer system based on magnetic-coupled resonators is modeled and optimized by using low-frequency integral equation solver. For the low-frequency transfer system, the mesh size after discretization is usually much smaller than the wavelength. Hence, the low-frequency solvers are proposed to model this kind of structures with tiny meshes. After the spiral resonators are determined at specific frequency, we only need to optimize the distance between resonators and two loops. The numerical results show that we are no need to re-mesh the whole transfer system during the distance searching procedure, and the optimized distance can be easily obtained.","PeriodicalId":6321,"journal":{"name":"2013 IEEE MTT-S International Microwave Workshop Series on RF and Wireless Technologies for Biomedical and Healthcare Applications (IMWS-BIO)","volume":"23 1","pages":"1-3"},"PeriodicalIF":0.0,"publicationDate":"2013-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85821543","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2013-12-01DOI: 10.1109/IMWS-BIO.2013.6756243
S. Salman, Zheyu Wang, A. Kiourti, E. Topsakal, J. Volakis
This paper discusses the design and testing of a new robust system for in-situ continuous monitoring of the lung's condition. The system is composed of a body worn medical sensor with an accompanying wireless body area network (BAN) for remote health monitoring. The lung sensor consists of 17 electrodes, and operates at 40MHz. It aims to approximate the dielectric constant of the underlying lung tissue independent of variations in the outer layers (skin, fat, muscle and bone). Concurrently, the wireless BAN is used to transmit the measured dielectric constant to a mobile device via Bluetooth for continuous remote healthcare monitoring. In this paper, we present the design and experimental validation of the proposed lung sensor integrated with wireless BAN data link.
{"title":"A non-invasive lung monitoring sensor with integrated body-area network","authors":"S. Salman, Zheyu Wang, A. Kiourti, E. Topsakal, J. Volakis","doi":"10.1109/IMWS-BIO.2013.6756243","DOIUrl":"https://doi.org/10.1109/IMWS-BIO.2013.6756243","url":null,"abstract":"This paper discusses the design and testing of a new robust system for in-situ continuous monitoring of the lung's condition. The system is composed of a body worn medical sensor with an accompanying wireless body area network (BAN) for remote health monitoring. The lung sensor consists of 17 electrodes, and operates at 40MHz. It aims to approximate the dielectric constant of the underlying lung tissue independent of variations in the outer layers (skin, fat, muscle and bone). Concurrently, the wireless BAN is used to transmit the measured dielectric constant to a mobile device via Bluetooth for continuous remote healthcare monitoring. In this paper, we present the design and experimental validation of the proposed lung sensor integrated with wireless BAN data link.","PeriodicalId":6321,"journal":{"name":"2013 IEEE MTT-S International Microwave Workshop Series on RF and Wireless Technologies for Biomedical and Healthcare Applications (IMWS-BIO)","volume":"22 1","pages":"1-3"},"PeriodicalIF":0.0,"publicationDate":"2013-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86510486","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2013-12-01DOI: 10.1109/IMWS-BIO.2013.6756196
T. Bjorninen, E. Moradi, L. Sydanheimo, J. Carmena, J. Rabaey, L. Ukkonen
We analyze the power and voltage transfer in a wireless link from an on-body transmit antenna to 1×1×1 mm3 antenna in a cortical implant to provide power and data telemetry for a battery-free brain-machine interface microelectronic system. We compare the wireless link performance with regular, segmented, and tilted transmit loop antennas. Moreover, we analyze the performance improvement achieved by inserting a magneto-dielectric core in the implant antenna. We also attest the simulation model through measurements in a liquid head phantom.
{"title":"Electromagnetic modelling and measurement of antennas for wireless brain-machine interface systems","authors":"T. Bjorninen, E. Moradi, L. Sydanheimo, J. Carmena, J. Rabaey, L. Ukkonen","doi":"10.1109/IMWS-BIO.2013.6756196","DOIUrl":"https://doi.org/10.1109/IMWS-BIO.2013.6756196","url":null,"abstract":"We analyze the power and voltage transfer in a wireless link from an on-body transmit antenna to 1×1×1 mm3 antenna in a cortical implant to provide power and data telemetry for a battery-free brain-machine interface microelectronic system. We compare the wireless link performance with regular, segmented, and tilted transmit loop antennas. Moreover, we analyze the performance improvement achieved by inserting a magneto-dielectric core in the implant antenna. We also attest the simulation model through measurements in a liquid head phantom.","PeriodicalId":6321,"journal":{"name":"2013 IEEE MTT-S International Microwave Workshop Series on RF and Wireless Technologies for Biomedical and Healthcare Applications (IMWS-BIO)","volume":"144 1","pages":"1-3"},"PeriodicalIF":0.0,"publicationDate":"2013-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85672101","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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