Improved subtraction by adiabatic FAIR perfusion imaging.
For pulsed arterial spin labeling techniques (e.g., FAIR), mismatches between the imaging and inversion slice profile result in a nonperfusion-related offset. Several methods have been proposed to reduce subtraction errors in FAIR imaging. Here an acquisition method for FAIR experiments based on adiabatic principles is proposed. It is shown that with adiabatic pulses the same pulse can be used for labeling and echo refocusing, thereby reducing the mismatch between imaging and labeling slice. A twofold reduction in subtraction errors compared to 5-lobe sinc excitation was shown both experimentally and by simulation.
Schepers
Janneke
J
Department of Experimental in vivo NMR, Image Sciences Institute, University Medical Center Utrecht, Utrecht, The Netherlands. janneke@invivonmr.uu.nl
Garwood
Michael
M
van der Sanden
Boudewijn
B
Nicolay
Klaas
K
D000818:Animals; D001921:Brain / Q000098:blood supply*; D017352:Echo-Planar Imaging / Q000379:methods*; D006801:Humans; D007089:Image Enhancement / Q000379:methods*; D007091:Image Processing, Computer-Assisted; D019047:Phantoms, Imaging; D051381:Rats; D012039:Regional Blood Flow / Q000502:physiology; D012680:Sensitivity and Specificity; D013382:Subtraction Technique