The molding method of the invention is a low-temperature, liquid-phase, injection molding process using an externally heated mold. Each fetched program instruction has an associated status bit, which is set if the instruction excepts. The body of the waveguide may also be recessed away from the medium in an area surrounding the waveguide’s aperture to further confine the energy emerging from the waveguide to the small spot adjacent the tip in the medium. , a sleep state, the CKE control circuit controls a CKE signal outputted to the SDRAM such that it is fixed to a Low level. The refined AC map is used to correct attenuation in collected nuclear data which is reconstructed into an attenuation corrected image of the patient.