In a GRASE (Gradient and Spin-Echo) magnetic resonance method, most profiles in k-space with a certain Ky value are measured with different magnetic field read gradient polarity and at different time intervals from the excitation RF-pulse. The two resulting sets of measurements, with positive and negative read gradient polarity, respectively, are used to correct read gradient polarity dependent phase errors, in order to obtain reconstructed images in which the effects of these phase errors are greatly reduced. In an improved version the measurements are used to reconstruct images with a predictable T2 weighting.
GRASE MRI WITH READ GRADIENT POLARITY CORRECTION AND T2 MEASUREMENT