A computer system which includes one or more wireless interface devices that are adapted to communicate with a remote host over a radio link. The integrated circuit includes a combinational logic block, a memory block, a power supply block, and a control block. The method further includes sending to the second computing device, a second request for an approval to initiate the transfer. As total voltage of the PR module is increased by series connection, it is not necessary to use components of high-voltage specifications and water cannot go into sockets, thus preventing electricity leakage. Areas of pathologic change identified in this manner may be presented as outlines in the subtraction image or as highlighted regions in the original radiographic image so that, in effect, temporal subtraction becomes a \u201cbackground\u201d process for computer-aided diagnosis.