Zobrazeno 1 - 10
of 40
pro vyhledávání: '"Krishna N. Kurpad"'
Autor:
Qingyan Wang, Wolfgang Kainz, Jingshen Liu, Ji Chen, Yu Wang, Ran Guo, Krishna N. Kurpad, Jianfeng Zheng
Publikováno v:
IEEE Transactions on Electromagnetic Compatibility. 64:286-294
This article presents a cascaded heterogeneous equivalent network for the evaluation of radiofrequency (RF) induced safety hazards on electrically long active implantable medical devices (AIMDs) exposed to magnetic resonance imaging systems. AIMDs in
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::a3a30026ee3ff28d97821561057b9163
https://doi.org/10.1109/temc.2021.3121203
https://doi.org/10.1109/temc.2021.3121203
Autor:
Yu Wang, Jianfeng Zheng, Ji Chen, Qingyan Wang, Krishna N. Kurpad, Norbert Kaula, Ran Guo, Wei Hu, Jay Jiang, Wolfgang Kainz, Stuart A. Long
Publikováno v:
Magnetic resonance in medicineREFERENCES. 87(1)
PURPOSE During MR scans, abandoned leads from active implantable medical devices (AIMDs) can experience excessive heating at the lead tip, depending on the type of termination applied to the proximal contacts (proximal end treatment). The influence o
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::40fdd3a9bfc972cf278b061494b1fc22
https://pubmed.ncbi.nlm.nih.gov/34378816
https://pubmed.ncbi.nlm.nih.gov/34378816
Publikováno v:
EMBC
We present methods to harvest wireless power directly from the MRI RF field. The system includes a harvester coil to capture RF energy and an RF-DC converter for rectification. Energy harvesting by the harvester coil is modeled as a function of the M
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::4ffdb5df33144a3077ba2f558cd798ba
https://pubmed.ncbi.nlm.nih.gov/33018268
https://pubmed.ncbi.nlm.nih.gov/33018268
Autor:
Krishna N. Kurpad, Sean B. Fain, Orhan Unal, Samuel A. Hurley, Madhav Venkateswaran, Peng Wang, Alexey Samsonov
Publikováno v:
IEEE Transactions on Biomedical Engineering. 64:70-77
Objective: To model inductive coupling of endovascular coils with transmit RF excitation for selecting coils for MRI-guided interventions. Methods: Independent and computationally efficient FEM models are developed for the endovascular coil, cable, t
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::9385518ddb87d6a9fc700a77ee31252f
https://doi.org/10.1109/tbme.2016.2538279
https://doi.org/10.1109/tbme.2016.2538279
The RF power amplifier is one of the major sub-units in the MR transmit chain. Solid-state devices form the core of modern amplifiers. In this chapter, the basics of MOSFET-based power amplification are first introduced. An examination of the differe
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::7ac4ff675db638ce2ad561538e1a2aa2
https://doi.org/10.1039/9781782623878-00264
https://doi.org/10.1039/9781782623878-00264
Autor:
David J. Niles, Jeremy W. Gordon, Matthew R. Smith, Eric Peterson, Sean B. Fain, Ian J. Rowland, Krishna N. Kurpad
Publikováno v:
IEEE Transactions on Biomedical Engineering. 59:45-49
Hyperpolarized (HP) (13)C-labeled pyruvate studies with magnetic resonance (MR) have been used to observe the kinetics of metabolism in vivo. Kinetic modeling to measure metabolic rates in vivo is currently limited because of nonspecific hyperpolariz
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::57130bfd1a5400c96d6f2c31aa3d3422
https://doi.org/10.1109/tbme.2011.2161988
https://doi.org/10.1109/tbme.2011.2161988
Publikováno v:
Magnetic Resonance in Medicine. 65:1799-1804
A radiofrequency coil based on a solenoid design was developed and integrated with a novel device for MR-guided breast interventions using a circumferential approach. The transmit/receive tapered solenoid design conforms to the shape of the pendent b
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::ed18637176c0aafa5a36ca9b61bf5291
https://doi.org/10.1002/mrm.22759
https://doi.org/10.1002/mrm.22759
Publikováno v:
Magnetic Resonance in Medicine. 62:218-228
A radiofrequency current source (RFCS) design using a high-power metal oxide semiconductor field effect transistor (MOSFET) that enables independent current control for parallel transmit applications is presented. The design of an RFCS integrated wit
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::4b7ee074b43a87454d197eb059b7580a
https://doi.org/10.1002/mrm.21988
https://doi.org/10.1002/mrm.21988
Publikováno v:
Magnetic Resonance in Medicine. 58:800-807
MR imaging and spectroscopy requires RF fields of high homogeneity. Quadrature volume coils meeting this requirement include the birdcage coil and the TEM resonator. We describe here a quadrature volume coil designed around a modified coaxial transmi
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::b41aece17d2fd051ce2e80809b33053c
https://doi.org/10.1002/mrm.21394
https://doi.org/10.1002/mrm.21394
Publikováno v:
Concepts in Magnetic Resonance Part B: Magnetic Resonance Engineering. :75-83
Both the optimization of B1 field homogeneity in high-field MRI and the implementation of the exciting new theory of transmit SENSE can be accomplished by individual and independent control of the amplitude and phase of current on the elements or run
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::cff62b1971345b81badfd7fffd2dcc9d
https://doi.org/10.1002/cmr.b.20059
https://doi.org/10.1002/cmr.b.20059