1. An oximeter system comprising: a noninvasive optical sensor including a detector capable of outputting an output signal indicative of light attenuated by body tissue, the output signal being usable to obtain values for one or more physiological parameters of the body tissue; and a processor configured to transform the output signal or a signal processed from the output signal, and under at least certain conditions to determine point-by-point values for the physiological parameters of the body tissue.