Texture feature maps (GLCM) of the MR images of the knee made with gradually reduced acquisition times (GRAPPA1–4). Image representation is shown on consecutive columns (left to right). The images show a gradual fading of the anatomical object features with a decreasing acquisition time. Note the degradation of the bone outline, which is a structure that is the most persistent on the image as indicated by arrows. The muscle tissue is indicated with an asterisk (upper row) and a small arrow (bottom row). The following texture features are present: GLCM entropy, histogram max, and GLCM-inverse difference moment.