Hadamard spectroscopic imaging technique as applied to study human calf muscles.

In vivo results obtained by the B1 insensitive Hadamard spectroscopic imaging multivolume technique used with a surface coil are shown. The functional behavior of different human calf muscles during exercise was determined and the Pi/PCr ratio in each calf muscle, during steady-state conditions, was measured as a function of work level. Different levels of metabolic and physical activity were observed at the three calf muscles.