In a control method for an image reading system comprising an image scanning apparatus selectively reading an original as a reflective or transmissive original, an image processing apparatus receiving image data read by the image scanning apparatus and executing image processing of the image data, an operating unit, and a display unit. The assembly includes an inflow plug inserted into the inflow section of the aortic root and having an apertured tube or cannula extending through the valve leaflets to an outflow plug inserted into the outflow section of the aortic root. If there is the possibility of overrun, image data of respective bands formed in band buffer 118 are sequentially compressed and stored into compressed image memory 115. A calibration circuit in the control circuit calibrates a default gain parameter to provide a desired output power.