An apparatus for efficiently recognizing a part of a body shown in each of plural axial images for one series of axial images obtained by imaging an object to be inspected with a modality. A plurality of pliable easily conformed weight packets are secured within the vest interior by fabric attachment pads together with a combination of elastic bands and belts. The page address portion of the physical address is encoded prior to being stored in a TLB. One or more elastic members, subjected to pressure or counter-thrust, are compressed, on opposite ends, between abutment means and a surface of the body, to determine a friction effect, which varies as a function of the rotation direction of the roller.