A toner comprising a modified polyester resin containing a structure represented by Formula or, wherein, in Formula and, R1 represents a hydrogen atom, a methyl group, or an ethyl group, R2 represents an aliphatic hydrocarbon which may be branched, or an aromatic hydrocarbon, and R3 represents a hydrogen atom, an alkyl group having 1 to 4 carbon atoms, or a phenyl group. The guide grooves and the lands meet conditions expressed by:\u03bb18\u2266DG\u2266\u03bb11 \u2003\u20031. A plurality of hollow cylindrical cooling channels projects from the plane of the fan plate, said channels creating intense turbulence in the air that is entrained by the rotation, thus intensifying the transfer of heat. A prestored general disease trend curve is compared against a patient specific disease trend curve, and the system makes an automated response such as adjusting therapy.