76 Matrix Size: Readout

The images presented demonstrate the effect of changing the acquisition matrix in the frequency-encoding (readout) direction. All are T2-weighted fast spin echo sagittal images of the lumbar spine. The acquisition matrix (readout x phase encoding) was 1024 × 256 for Fig. 76.1A, 512 × 256 for Fig. 76.1B, and 256 × 256 for both Fig. 76.2A and Fig. 76.2B. The image in Fig. 76.2B was further interpolated to 512 × 512 prior to display.

When the MR signal (echo) is produced, it is sampled in the presence of a gradient magnetic field. This gradient is thus referred to as the readout or read

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