FIGURE 1.
Representative phosphocreatine (PCr) curves and index of blood volume maps (A) Right side: PCr curves before, during and after exercise for a young (33 year-old) and old (72 year-old) male, the inset shows an example of thigh muscle with the region of interest (ROI) covered by 10-cm 31P tuned surface coil in red and approximate region used in ROI drawing for muscle perfusion quantification at rest in blue. (B) Left side: Corresponding diffusion-weighted imaging that have been superimposed with the perfusion map measured as the index of blood volume (1/β) calculated based on equation (1) as discussed in the text for the slice diffusion sensitization.