Controlled Aliasing in Parallel Imaging Results in Higher Acceleration
Caipirinha is Brazil's national cocktail, made from sugar cane liqueur (cachaça), sugar, ice, and lime. It received some recent increased world-wide recognition as the result of news coverage of the 2014 FIFA World Cup. In MRI, CAIPIRINHA (Controlled Aliasing in Parallel Imaging Results in Higher Acceleration) is a data acquisition technique, offered by Siemens, that significantly reduces breath-holds without affecting image resolution, coverage, or contrast. It can be combined with 3D T1 VIBE (allows for SPAIR and spectral FS) or 3D Dixon (Four contrasts: in phase, opposed phase, fat, and water) in a single short breath-hold. CAIPIRINHA uses a group unique k-space sampling patterns to reduce pixel aliasing and overlap on reconstructed images. Acquired points in k-space are shifted from one another by applying additional offsets to the phase-encoding gradient tables.
