Double-tuned 31 P/ 1 H human head array with high performance at both frequencies for spectroscopic imaging at 9.4T
To develop a robust design of a human head double-tuned P/ H array, which provides good performance at both P and H frequencies for MR spectroscopic imaging at 9.4T. Increasing the number of surface loops in a human head array improves the peripheral signal-to-noise ratio (SNR), while the central SN...
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| Published in: | Magnetic resonance in medicine Vol. 84; no. 2; pp. 1076 - 1089 |
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| Main Authors: | , , , , , |
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01-08-2020
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| Abstract | To develop a robust design of a human head double-tuned
P/
H array, which provides good performance at both
P and
H frequencies for MR spectroscopic imaging at 9.4T.
Increasing the number of surface loops in a human head array improves the peripheral signal-to-noise ratio (SNR), while the central SNR doesn't substantially change. High peripheral SNR can contaminate MR spectroscopic imaging data at both
H and
P frequency. To minimize this effect, we limited the number of elements in the
P array to 10, i.e., 8 transceiver surface loops circumscribing the head and 2 receive "vertical" loops placed at the superior location. The
H-portion of the array also consists of 10 elements, i.e., 8 transceiver surface loops circumscribing the head and 2 transceiver "vertical" loops at the superior location of the head. Both the
P array and
H array are placed in a single layer at the same distance to the head, which provides high loading and, thus, a good performance for both arrays.
Transmit efficiency of the
H-portion of the double-tuned array was very similar to that of the single-tuned arrays of similar size. Also, addition of the cross-loops substantially improved the brain coverage.
We developed a novel
P/
H double-tuned array for MR spectroscopic imaging of a human brain at 9.4T. Placing both
P and
H loops in a single layer provides for high transmit efficiency at both frequencies without compromising SNR near the brain center at the
P-frequency. Addition of the cross-loops at the superior location improves the brain coverage. |
|---|---|
| AbstractList | To develop a robust design of a human head double-tuned
P/
H array, which provides good performance at both
P and
H frequencies for MR spectroscopic imaging at 9.4T.
Increasing the number of surface loops in a human head array improves the peripheral signal-to-noise ratio (SNR), while the central SNR doesn't substantially change. High peripheral SNR can contaminate MR spectroscopic imaging data at both
H and
P frequency. To minimize this effect, we limited the number of elements in the
P array to 10, i.e., 8 transceiver surface loops circumscribing the head and 2 receive "vertical" loops placed at the superior location. The
H-portion of the array also consists of 10 elements, i.e., 8 transceiver surface loops circumscribing the head and 2 transceiver "vertical" loops at the superior location of the head. Both the
P array and
H array are placed in a single layer at the same distance to the head, which provides high loading and, thus, a good performance for both arrays.
Transmit efficiency of the
H-portion of the double-tuned array was very similar to that of the single-tuned arrays of similar size. Also, addition of the cross-loops substantially improved the brain coverage.
We developed a novel
P/
H double-tuned array for MR spectroscopic imaging of a human brain at 9.4T. Placing both
P and
H loops in a single layer provides for high transmit efficiency at both frequencies without compromising SNR near the brain center at the
P-frequency. Addition of the cross-loops at the superior location improves the brain coverage. PURPOSETo develop a robust design of a human head double-tuned 31 P/1 H array, which provides good performance at both 31 P and 1 H frequencies for MR spectroscopic imaging at 9.4T. METHODSIncreasing the number of surface loops in a human head array improves the peripheral signal-to-noise ratio (SNR), while the central SNR doesn't substantially change. High peripheral SNR can contaminate MR spectroscopic imaging data at both 1 H and 31 P frequency. To minimize this effect, we limited the number of elements in the 31 P array to 10, i.e., 8 transceiver surface loops circumscribing the head and 2 receive "vertical" loops placed at the superior location. The 1 H-portion of the array also consists of 10 elements, i.e., 8 transceiver surface loops circumscribing the head and 2 transceiver "vertical" loops at the superior location of the head. Both the 31 P array and 1 H array are placed in a single layer at the same distance to the head, which provides high loading and, thus, a good performance for both arrays. RESULTSTransmit efficiency of the 1 H-portion of the double-tuned array was very similar to that of the single-tuned arrays of similar size. Also, addition of the cross-loops substantially improved the brain coverage. CONCLUSIONWe developed a novel 31 P/1 H double-tuned array for MR spectroscopic imaging of a human brain at 9.4T. Placing both 31 P and 1 H loops in a single layer provides for high transmit efficiency at both frequencies without compromising SNR near the brain center at the 31 P-frequency. Addition of the cross-loops at the superior location improves the brain coverage. |
| Author | Dorst, Johanna Ruhm, Loreen Korzowski, Andreas Avdievich, Nikolai I Scheffler, Klaus Henning, Anke |
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| BackLink | https://www.ncbi.nlm.nih.gov/pubmed/32003031$$D View this record in MEDLINE/PubMed |
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| Cites_doi | 10.1002/mrm.22897 10.1002/mrm.27169 10.1016/j.jmr.2007.03.001 10.1007/s10334-013-0419-y 10.1002/mrm.24726 10.1002/mrm.1910160203 10.1002/mrm.22700 10.1002/mrm.26803 10.1002/mrm.26017 10.1002/mrm.23124 10.1002/jmri.24152 10.1002/mrm.21120 10.1002/mrm.26754 10.1016/0022-2364(85)90380-4 10.1002/mrm.25677 10.1002/mrm.20547 10.1002/mrm.20925 10.1002/(SICI)1522-2594(199911)42:5<952::AID-MRM16>3.0.CO;2-S 10.1002/mrm.24427 10.1002/mrm.25666 10.1002/1522-2594(200101)45:1<46::AID-MRM1008>3.0.CO;2-N 10.1002/nbm.3290 10.1016/j.neuroimage.2015.08.066 10.1002/nbm.3878 10.1002/mrm.1910290522 10.1002/nbm.3867 10.1002/mrm.27602 10.1016/j.mri.2011.12.011 10.1002/cmr.b.20002 10.1002/(SICI)1522-2594(200002)43:2<284::AID-MRM16>3.0.CO;2-C 10.1002/mrm.21948 10.1002/mrm.22028 10.1002/mrm.25618 10.1148/radiol.13130531 10.1002/mrm.22413 10.1002/nbm.3680 10.1002/mrm.10141 10.1002/mrm.24432 10.1007/s10334-016-0524-9 10.1007/s00723-011-0280-y 10.1002/cmr.b.21268 10.1088/0031-9155/55/2/N01 10.1002/mrm.21374 |
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| Keywords | double-tuned arrays central SNR RF human head coil ultra-high field MRI MRSI |
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| Snippet | To develop a robust design of a human head double-tuned
P/
H array, which provides good performance at both
P and
H frequencies for MR spectroscopic imaging at... PURPOSETo develop a robust design of a human head double-tuned 31 P/1 H array, which provides good performance at both 31 P and 1 H frequencies for MR... |
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| SubjectTerms | Brain - diagnostic imaging Equipment Design Head - diagnostic imaging Humans Magnetic Resonance Imaging Phantoms, Imaging Signal-To-Noise Ratio |
| Title | Double-tuned 31 P/ 1 H human head array with high performance at both frequencies for spectroscopic imaging at 9.4T |
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