Jonathan C. Sharp1, Donghui Yin2, Boguslaw Tomanek1, Scott B. King2
1Institute for Biodiagnostics (West),
National Research Council of
Imaging without B0-gradients by the TRASE method is based on echo trains with refocusing pulses produced by RF phase gradient fields. K-space evolution occurs between successive echoes. The use of phase gradients means that pulse phases vary spatially. Also |B1| inhomogeneity, causing flip-angle errors, is always present. Both effects combine to result in each location in the sample experiencing a different pulse sequence, which results in a position-dependent point-spread-function (PSF). We examine how the relationships between sequence design, coil design and flip angle calibration can be used to maximize the sample volume offering a good PSF.