Development and evaluation of a multichannel endorectal RF coil for prostate MRI at 7T in combination with an external surface array

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Abstract

Purpose To develop and evaluate a sterilizable multichannel endorectal coil (ERC) for use in combination with an external surface array (ESA) for high-resolution anatomical and functional studies of the prostate at 7T. Materials and Methods A two-loop ERC (ERC-2L) and a microstrip-loop ERC (ERC-ML) were compared at 7T in terms of transmit and receive performance. The best-performing ERC was evaluated alone and in combination with the ESA through 1) simulations on both phantom and an anatomically correct numerical human model to assess B1+ transmit and specific absorption rate (SAR) efficiencies, and 2) phantom experiments to calculate B1+ transmit efficiency and signal-to-noise ratio (SNR). Phantom studies were also performed to look at heating when using the ERC as a transmitter and for comparing the new coil against a single-channel balloon-type ERC (ERC-b). High-resolution magnetic resonance imaging (MRI) acquisitions were performed on a single healthy subject using the two-channel ERC combined with the ESA. Results Compared to the ERC-ML, the ERC-2L demonstrated 20% higher SAR efficiency and higher SNR 3 cm from the coil. The presence of a tuned and detuned ERC-2L did not alter the peak local SAR of the ESA alone; however, the detuned ERC-2L had 45% less peak local SAR around the rectum compared to the tuned ERC-2L. The receive-only version of the ERC-2L improved the SNR 4.7-fold and 1.3-fold compared to the ESA and ERC-b, respectively. In combination with the ESA, the ERC-2L supported in-plane voxel-size of 0.36 × 0.36 mm2 in T2-weighted anatomic imaging. Conclusion The reusable ERC-2L combined with an ESA offers a high SNR imaging platform for translational studies of the prostate at 7T.

Original languageEnglish (US)
Pages (from-to)1279-1287
Number of pages9
JournalJournal of Magnetic Resonance Imaging
Volume43
Issue number6
DOIs
StatePublished - Jun 1 2016

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Signal-To-Noise Ratio
Prostate
Magnetic Resonance Imaging
Rectum
Heating
Healthy Volunteers

Keywords

  • 7 Tesla body imaging
  • MRI
  • endorectal coil
  • prostate
  • prostate cancer
  • ultrahigh field

Cite this

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title = "Development and evaluation of a multichannel endorectal RF coil for prostate MRI at 7T in combination with an external surface array",
abstract = "Purpose To develop and evaluate a sterilizable multichannel endorectal coil (ERC) for use in combination with an external surface array (ESA) for high-resolution anatomical and functional studies of the prostate at 7T. Materials and Methods A two-loop ERC (ERC-2L) and a microstrip-loop ERC (ERC-ML) were compared at 7T in terms of transmit and receive performance. The best-performing ERC was evaluated alone and in combination with the ESA through 1) simulations on both phantom and an anatomically correct numerical human model to assess B1+ transmit and specific absorption rate (SAR) efficiencies, and 2) phantom experiments to calculate B1+ transmit efficiency and signal-to-noise ratio (SNR). Phantom studies were also performed to look at heating when using the ERC as a transmitter and for comparing the new coil against a single-channel balloon-type ERC (ERC-b). High-resolution magnetic resonance imaging (MRI) acquisitions were performed on a single healthy subject using the two-channel ERC combined with the ESA. Results Compared to the ERC-ML, the ERC-2L demonstrated 20{\%} higher SAR efficiency and higher SNR 3 cm from the coil. The presence of a tuned and detuned ERC-2L did not alter the peak local SAR of the ESA alone; however, the detuned ERC-2L had 45{\%} less peak local SAR around the rectum compared to the tuned ERC-2L. The receive-only version of the ERC-2L improved the SNR 4.7-fold and 1.3-fold compared to the ESA and ERC-b, respectively. In combination with the ESA, the ERC-2L supported in-plane voxel-size of 0.36 × 0.36 mm2 in T2-weighted anatomic imaging. Conclusion The reusable ERC-2L combined with an ESA offers a high SNR imaging platform for translational studies of the prostate at 7T.",
keywords = "7 Tesla body imaging, MRI, endorectal coil, prostate, prostate cancer, ultrahigh field",
author = "Arcan Erturk and Jinfeng Tian and {Van de Moortele}, Pierre-Francois and Gregor Adriany and Greg Metzger",
year = "2016",
month = "6",
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doi = "10.1002/jmri.25099",
language = "English (US)",
volume = "43",
pages = "1279--1287",
journal = "Journal of Magnetic Resonance Imaging",
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publisher = "John Wiley and Sons Inc.",
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TY - JOUR

T1 - Development and evaluation of a multichannel endorectal RF coil for prostate MRI at 7T in combination with an external surface array

AU - Erturk, Arcan

AU - Tian, Jinfeng

AU - Van de Moortele, Pierre-Francois

AU - Adriany, Gregor

AU - Metzger, Greg

PY - 2016/6/1

Y1 - 2016/6/1

N2 - Purpose To develop and evaluate a sterilizable multichannel endorectal coil (ERC) for use in combination with an external surface array (ESA) for high-resolution anatomical and functional studies of the prostate at 7T. Materials and Methods A two-loop ERC (ERC-2L) and a microstrip-loop ERC (ERC-ML) were compared at 7T in terms of transmit and receive performance. The best-performing ERC was evaluated alone and in combination with the ESA through 1) simulations on both phantom and an anatomically correct numerical human model to assess B1+ transmit and specific absorption rate (SAR) efficiencies, and 2) phantom experiments to calculate B1+ transmit efficiency and signal-to-noise ratio (SNR). Phantom studies were also performed to look at heating when using the ERC as a transmitter and for comparing the new coil against a single-channel balloon-type ERC (ERC-b). High-resolution magnetic resonance imaging (MRI) acquisitions were performed on a single healthy subject using the two-channel ERC combined with the ESA. Results Compared to the ERC-ML, the ERC-2L demonstrated 20% higher SAR efficiency and higher SNR 3 cm from the coil. The presence of a tuned and detuned ERC-2L did not alter the peak local SAR of the ESA alone; however, the detuned ERC-2L had 45% less peak local SAR around the rectum compared to the tuned ERC-2L. The receive-only version of the ERC-2L improved the SNR 4.7-fold and 1.3-fold compared to the ESA and ERC-b, respectively. In combination with the ESA, the ERC-2L supported in-plane voxel-size of 0.36 × 0.36 mm2 in T2-weighted anatomic imaging. Conclusion The reusable ERC-2L combined with an ESA offers a high SNR imaging platform for translational studies of the prostate at 7T.

AB - Purpose To develop and evaluate a sterilizable multichannel endorectal coil (ERC) for use in combination with an external surface array (ESA) for high-resolution anatomical and functional studies of the prostate at 7T. Materials and Methods A two-loop ERC (ERC-2L) and a microstrip-loop ERC (ERC-ML) were compared at 7T in terms of transmit and receive performance. The best-performing ERC was evaluated alone and in combination with the ESA through 1) simulations on both phantom and an anatomically correct numerical human model to assess B1+ transmit and specific absorption rate (SAR) efficiencies, and 2) phantom experiments to calculate B1+ transmit efficiency and signal-to-noise ratio (SNR). Phantom studies were also performed to look at heating when using the ERC as a transmitter and for comparing the new coil against a single-channel balloon-type ERC (ERC-b). High-resolution magnetic resonance imaging (MRI) acquisitions were performed on a single healthy subject using the two-channel ERC combined with the ESA. Results Compared to the ERC-ML, the ERC-2L demonstrated 20% higher SAR efficiency and higher SNR 3 cm from the coil. The presence of a tuned and detuned ERC-2L did not alter the peak local SAR of the ESA alone; however, the detuned ERC-2L had 45% less peak local SAR around the rectum compared to the tuned ERC-2L. The receive-only version of the ERC-2L improved the SNR 4.7-fold and 1.3-fold compared to the ESA and ERC-b, respectively. In combination with the ESA, the ERC-2L supported in-plane voxel-size of 0.36 × 0.36 mm2 in T2-weighted anatomic imaging. Conclusion The reusable ERC-2L combined with an ESA offers a high SNR imaging platform for translational studies of the prostate at 7T.

KW - 7 Tesla body imaging

KW - MRI

KW - endorectal coil

KW - prostate

KW - prostate cancer

KW - ultrahigh field

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