"The matrix size is the number of frequency encoding steps, in one direction; and the number of phase encoding steps, in the other direction of the image plane. Assuming everything else is constant, increasing the number of frequency encodings or the number of phase steps results in improved resolution. The frequency encoding depends on how rapidly the FID signal is sampled by the scanner. Increasing the sampling rate results in no time penalty. Increasing the number of phase steps increases the time of the acquisition proportionately. This is why images that have fewer phase encodings than frequency encodings, e.g. 128x256 or 192x256 will be used."
Expected headings
"Matrix size"
"Field of view"
"Slice thickness"
"The matrix size is the number of frequency encoding steps, in one direction; and the number of phase encoding steps, in the other direction of the image plane. Assuming everything else is constant, increasing the number of frequency encodings or the number of phase steps results in improved resolution. The frequency encoding depends on how rapidly the FID signal is sampled by the scanner. Increasing the sampling rate results in no time penalty. Increasing the number of phase steps increases the time of the acquisition proportionately. This is why images that have fewer phase encodings than frequency encodings, e.g. 128x256 or 192x256 will be used."
"The field of view is the size of the area that the matrix of phase and frequency encoding cover. Dividing the field of view by the matrix size gives you the in-plane voxel size; hence, increasing the field of view in either direction increases the size of the voxels and decreases the resolution. Decreasing the field of view improves the resolution."