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Feasibility and characterization of a safe susceptibility‐matched endorectal coil for MR spectroscopy
- Source :
- NMR in Biomedicine, NMR in Biomedicine, 2020, 33 (11), ⟨10.1002/nbm.4384⟩, NMR in Biomedicine, Wiley, 2020, 33 (11), ⟨10.1002/nbm.4384⟩
- Publication Year :
- 2020
- Publisher :
- HAL CCSD, 2020.
-
Abstract
- When using endorectal coils, local radiofrequency (RF) heating may occur in the surrounding tissue. Furthermore, most endorectal coils create a susceptibility artifact detrimental to both anatomical magnetic resonance imaging (MRI) and spectroscopy (MRS) acquisitions. We aimed at assessing the safety and MRS performance of a susceptibility-matched endorectal coil for further rectal wall analysis. Experiments were performed on a General Electric MR750 3 T scanner. A variable number of miniaturized passive RF traps were incorporated in the reception cable. The assessment of RF heating and coil sensitivity was conducted on a 1.5% agar-agar phantom doped with NaCl. Several susceptibility-matched materials such as Ultem, perfluorocarbon and barium sulfate were then compared with an external coil. Finally, Ultem was used as a solid support for an endorectal coil and compared with a reference coil. Phantom experiments exhibited a complete suppression of both the RF heating phenomenon and the coil sensitivity artifact. Ultem was the material that produced the smallest image distortion. The full width at half maximum of MR spectra acquired using the susceptibility-matched endorectal coil showed at least 30% narrowing compared with a reference endorectal coil. A susceptibility-matched endorectal coil with RF traps incorporated was validated on phantoms. This coil appears to be a promising device for future in vivo experiments.
- Subjects :
- In vivo magnetic resonance spectroscopy
Scanner
Magnetic Resonance Spectroscopy
Materials science
Radio Waves
[SDV.IB.IMA]Life Sciences [q-bio]/Bioengineering/Imaging
Signal-To-Noise Ratio
Imaging phantom
030218 nuclear medicine & medical imaging
03 medical and health sciences
0302 clinical medicine
Nuclear magnetic resonance
Dielectric heating
medicine
Humans
Radiology, Nuclear Medicine and imaging
Spectroscopy
ComputingMilieux_MISCELLANEOUS
[SPI.SIGNAL] Engineering Sciences [physics]/Signal and Image processing
medicine.diagnostic_test
Phantoms, Imaging
Rectum
Magnetic resonance imaging
[SPI.TRON] Engineering Sciences [physics]/Electronics
[SPI.TRON]Engineering Sciences [physics]/Electronics
Full width at half maximum
[SDV.IB.IMA] Life Sciences [q-bio]/Bioengineering/Imaging
Electromagnetic coil
Feasibility Studies
Molecular Medicine
[SPI.SIGNAL]Engineering Sciences [physics]/Signal and Image processing
030217 neurology & neurosurgery
Endorectal coil
Subjects
Details
- Language :
- English
- ISSN :
- 09523480 and 10991492
- Database :
- OpenAIRE
- Journal :
- NMR in Biomedicine, NMR in Biomedicine, 2020, 33 (11), ⟨10.1002/nbm.4384⟩, NMR in Biomedicine, Wiley, 2020, 33 (11), ⟨10.1002/nbm.4384⟩
- Accession number :
- edsair.doi.dedup.....27a5dcf98b83bd7a5bacfc0fe60edb0e