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  1. AU="Hollingsworth, Neal A"
  2. AU=Restifo Nicholas P AU=Restifo Nicholas P
  3. AU="Farmer, Claire"
  4. AU="Hyeong, Seok-Ki"
  5. AU=Sathananthan A Henry
  6. AU="Ross D. Pollock"
  7. AU="Abouelkhair, Mohamed A"
  8. AU="Draia, Ahmed N"
  9. AU="Martins, Paulo"
  10. AU=Elliott P
  11. AU="Gill, J L"
  12. AU="Marmé, Dieter"
  13. AU=St John Ashley L
  14. AU="Macpherson, Catherine Fiona"
  15. AU=Malloy Giovanni S P
  16. AU="Bovino, Antonio"
  17. AU="Deseri, Luca"
  18. AU="Cunningham, C W"
  19. AU="Haas, Brian"
  20. AU="Raia, Anais"
  21. AU=Gollin Susanne M
  22. AU="Xie, Hong-Guang"
  23. AU="Ford, Paul Leicester"
  24. AU="Garver-Daniels, N. E."
  25. AU="De Pisapia, Nicola"
  26. AU="Inoue, Kazunori"
  27. AU="Tüzün, Funda"
  28. AU="McDonough, John"
  29. AU="Puche-Cañas, Emilio"
  30. AU="Rahim, Faraan O"
  31. AU="Barritt, Andrew W"

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  1. Artikel ; Online: A Review of Current Control and Decoupling Methods for MRI Transmit Arrays.

    Cui, Jiaming / Hollingsworth, Neal A / Wright, Steven M

    IEEE reviews in biomedical engineering

    2024  Band PP

    Abstract: The shortened radio frequency wavelength in high field MRI makes it challenging to create a uniform excitation pattern over a large field of view, or to achieve satisfactory transmission efficiency at a local area. Transmit arrays are one tool that can ... ...

    Abstract The shortened radio frequency wavelength in high field MRI makes it challenging to create a uniform excitation pattern over a large field of view, or to achieve satisfactory transmission efficiency at a local area. Transmit arrays are one tool that can be used to create a desired excitation pattern. To be effective, it is important to be able to control the current amplitude and phase at the array elements. The control of the current may get complicated by the coil coupling in many applications. Various methods have been proposed to achieve current control, either in the presence of coupling, or by effectively decouple the array elements. These methods are applied in different subsystems in the RF transmission chain: coil; coil-amplifier interface; amplifier, etc. In this review paper, we provide an overview of the various approaches and aspects of transmit current control and decoupling.
    Sprache Englisch
    Erscheinungsdatum 2024-01-09
    Erscheinungsland United States
    Dokumenttyp Journal Article
    ISSN 1941-1189
    ISSN (online) 1941-1189
    DOI 10.1109/RBME.2024.3351713
    Datenquelle MEDical Literature Analysis and Retrieval System OnLINE

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  2. Artikel ; Online: An eight-channel T/R head coil for parallel transmit MRI at 3T using ultra-low output impedance amplifiers.

    Moody, Katherine Lynn / Hollingsworth, Neal A / Zhao, Feng / Nielsen, Jon-Fredrik / Noll, Douglas C / Wright, Steven M / McDougall, Mary Preston

    Journal of magnetic resonance (San Diego, Calif. : 1997)

    2014  Band 246, Seite(n) 62–68

    Abstract: Parallel transmit is an emerging technology to address the technical challenges associated with MR imaging at high field strengths. When developing arrays for parallel transmit systems, one of the primary factors to be considered is the mechanism to ... ...

    Abstract Parallel transmit is an emerging technology to address the technical challenges associated with MR imaging at high field strengths. When developing arrays for parallel transmit systems, one of the primary factors to be considered is the mechanism to manage coupling and create independently operating channels. Recent work has demonstrated the use of amplifiers to provide some or all of the channel-to-channel isolation, reducing the need for on-coil decoupling networks in a manner analogous to the use of isolation preamplifiers with receive coils. This paper discusses an eight-channel transmit/receive head array for use with an ultra-low output impedance (ULOI) parallel transmit system. The ULOI amplifiers eliminated the need for a complex lumped element network to decouple the eight-rung array. The design and construction details of the array are discussed in addition to the measurement considerations required for appropriately characterizing an array when using ULOI amplifiers. B1 maps and coupling matrices are used to verify the performance of the system.
    Mesh-Begriff(e) Amplifiers, Electronic ; Electric Conductivity ; Equipment Design ; Equipment Failure Analysis ; Image Enhancement/instrumentation ; Magnetic Resonance Imaging/instrumentation ; Magnetics/instrumentation ; Phantoms, Imaging ; Reproducibility of Results ; Sensitivity and Specificity ; Signal-To-Noise Ratio ; Transducers
    Sprache Englisch
    Erscheinungsdatum 2014-07-03
    Erscheinungsland United States
    Dokumenttyp Evaluation Study ; Journal Article ; Research Support, N.I.H., Extramural
    ZDB-ID 1469665-4
    ISSN 1096-0856 ; 1557-8968 ; 1090-7807 ; 0022-2364
    ISSN (online) 1096-0856 ; 1557-8968
    ISSN 1090-7807 ; 0022-2364
    DOI 10.1016/j.jmr.2014.06.019
    Datenquelle MEDical Literature Analysis and Retrieval System OnLINE

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  3. Artikel: Highly parallel transmit/receive systems for dynamic MRI.

    Wright, Steven M / McDougall, Mary Preston / Feng, Ke / Hollingsworth, Neal A / Bosshard, John C / Chang, Chieh-Wei

    Annual International Conference of the IEEE Engineering in Medicine and Biology Society. IEEE Engineering in Medicine and Biology Society. Annual International Conference

    2009  Band 2009, Seite(n) 4053–4056

    Abstract: Dynamic MRI continues to grow in interest and capability with the introduction of 64 and 128 channel receivers, and, more recently, 8 and 16 channel parallel transmitters. This talk will describe progress in developing a 64 channel transmitter and ... ...

    Abstract Dynamic MRI continues to grow in interest and capability with the introduction of 64 and 128 channel receivers, and, more recently, 8 and 16 channel parallel transmitters. This talk will describe progress in developing a 64 channel transmitter and applications in high-speed MR imaging, reaching 1000 frames per second.
    Mesh-Begriff(e) Algorithms ; Computers ; Elasticity Imaging Techniques/methods ; Electronics ; Equipment Design/methods ; Gelatin ; Magnetic Resonance Imaging/instrumentation ; Magnetic Resonance Imaging/methods ; Phantoms, Imaging ; Radio Waves ; Reproducibility of Results ; Software ; Transducers
    Chemische Substanzen Gelatin (9000-70-8)
    Sprache Englisch
    Erscheinungsdatum 2009-11-18
    Erscheinungsland United States
    Dokumenttyp Journal Article ; Research Support, N.I.H., Extramural
    ISSN 2375-7477
    ISSN 2375-7477
    DOI 10.1109/IEMBS.2009.5333172
    Datenquelle MEDical Literature Analysis and Retrieval System OnLINE

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