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.
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.
Authors: Jan Petr; Henri J M M Mutsaerts; Enrico De Vita; Rebecca M E Steketee; Marion Smits; Aart J Nederveen; Frank Hofheinz; Jörg van den Hoff; Iris Asllani Journal: MAGMA Date: 2018-06-18 Impact factor: 2.310
Authors: Liang Zhan; Neda Jahanshad; Daniel B Ennis; Yan Jin; Matthew A Bernstein; Bret J Borowski; Clifford R Jack; Arthur W Toga; Alex D Leow; Paul M Thompson Journal: Hum Brain Mapp Date: 2012-04-21 Impact factor: 5.038
Authors: Tao Zhang; Thomas Grafendorfer; Joseph Y Cheng; Peigang Ning; Bob Rainey; Mark Giancola; Sarah Ortman; Fraser J Robb; Paul D Calderon; Brian A Hargreaves; Michael Lustig; Greig C Scott; John M Pauly; Shreyas S Vasanawala Journal: Magn Reson Med Date: 2015-09-29 Impact factor: 4.668