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Improving quality of arterial spin labeling MR imaging at 3 Tesla with a 32-channel coil and parallel imaging.

Jean-Christophe Ferré 1, 2, 3, * Jan Petr 1 Elise Bannier 1, 3 Christian Barillot 1, 3 Jean-Yves Gauvrit 1, 2, 3 
* Corresponding author
1 VisAGeS - Vision, Action et Gestion d'informations en Santé
INSERM - Institut National de la Santé et de la Recherche Médicale : U746, Inria Rennes – Bretagne Atlantique , IRISA-D5 - SIGNAUX ET IMAGES NUMÉRIQUES, ROBOTIQUE
Abstract : PURPOSE: To compare 12-channel and 32-channel phased-array coils and to determine the optimal parallel imaging (PI) technique and factor for brain perfusion imaging using Pulsed Arterial Spin labeling (PASL) at 3 Tesla (T). MATERIALS AND METHODS: Twenty-seven healthy volunteers underwent 10 different PASL perfusion PICORE Q2TIPS scans at 3T using 12-channel and 32-channel coils without PI and with GRAPPA or mSENSE using factor 2. PI with factor 3 and 4 were used only with the 32-channel coil. Visual quality was assessed using four parameters. Quantitative analyses were performed using temporal noise, contrast-to-noise and signal-to-noise ratios (CNR, SNR). RESULTS: Compared with 12-channel acquisition, the scores for 32-channel acquisition were significantly higher for overall visual quality, lower for noise and higher for SNR and CNR. With the 32-channel coil, artifact compromise achieved the best score with PI factor 2. Noise increased, SNR and CNR decreased with PI factor. However mSENSE 2 scores were not always significantly different from acquisition without PI. CONCLUSION: For PASL at 3T, the 32-channel coil at 3T provided better quality than the 12-channel coil. With the 32-channel coil, mSENSE 2 seemed to offer the best compromise for decreasing artifacts without significantly reducing SNR, CNR.
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Submitted on : Friday, August 10, 2012 - 12:47:29 PM
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Jean-Christophe Ferré, Jan Petr, Elise Bannier, Christian Barillot, Jean-Yves Gauvrit. Improving quality of arterial spin labeling MR imaging at 3 Tesla with a 32-channel coil and parallel imaging.. Journal of Magnetic Resonance Imaging, Wiley-Blackwell, 2012, 35 (5), pp.1233-9. ⟨10.1002/jmri.23586⟩. ⟨inserm-00723540⟩



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