A method for quantitatively analyzing digital images of approximately elliptical body organs, and in particular, echocardiographic images is provided. Each of the monitor circuits is operative to receive the supply voltage, or a signal representative thereof, and to generate an output signal indicative of a comparison between the supply voltage and a reference voltage. The process features a conductive gate structure defined from a composite polysilicon or amorphous layer, which in turn is obtained via a dual deposition procedure.