¹H MR spectroscopic imaging of the prostate at 7T using spectral-spatial pulses

  • Purpose To assess the feasibility of prostate ¹H MR spectroscopic imaging (MRSI) using low-power spectral-spatial (SPSP) pulses at 7T, exploiting accurate spectral selection and spatial selectivity simultaneously. Methods A double spin-echo sequence was equipped with SPSP refocusing pulses with a spectral selectivity of 1 ppm. Three-dimensional prostate ¹H-MRSI at 7T was performed with the SPSP-MRSI sequence using an 8-channel transmit array coil and an endorectal receive coil in three patients with prostate cancer and in one healthy subject. No additional water or lipid suppression pulses were used. Results Prostate ¹H-MRSI could be obtained well within specific absorption rate (SAR) limits in a clinically feasible time (10 min). Next to the common citrate signals, the prostate spectra exhibited high spermine signals concealing creatine and sometimes also choline. Residual lipid signals were observed at the edges of the prostate because of limitations in spectral and spatial selectivity. Conclusion It is possible to perform prostate ¹H-MRSI at 7T with a SPSP-MRSI sequence while using separate transmit and receive coils. This low-SAR MRSI concept provides the opportunity to increase spatial resolution of MRSI within reasonable scan times.

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Metadaten
Author:Miriam W. Lagemaat, Vincent Breukels, Eline K. Vos, Adam B. Kerr, Mark J. van Uden, Stephan Orzada, Andreas Bitz, Marnix C. Maas, Tom W. J. Scheenen
DOI:https://doi.org/10.1002/mrm.25569
ISSN:1522-2594
Parent Title (English):Magnetic Resonance in Medicine
Publisher:International Society for Magnetic Resonance in Medicine
Document Type:Article
Language:English
Year of Completion:2016
Volume:75
Issue:3
First Page:933
Last Page:945
Link:https://doi.org/10.1002/mrm.25569
Zugriffsart:campus
Institutes:FH Aachen / Fachbereich Elektrotechnik und Informationstechnik
collections:Verlag / International Society for Magnetic Resonance in Medicine