A thermal head has a heat storage layer bonded onto a surface of the substrate, a heating resistor provided on the heat storage layer, and a pair of electrode portions connected to the heating resistor. The cation of formula is contained in the preparation at a concentration of between 411 and 460. A threaded member is engageable into the anchor sleeve and includes a thread shank for threading with the anchor sleeve. The base 12 has a jointed part 24 disposed in a position below the simulated blood vessel 11 and formed by joining forming edges 26A, 26A of a cutout 26 extending along the simulated blood vessel 11 to impart a tensile stress in the diameter-increasing direction to the simulated blood vessel 11. According the invention, the following steps are additionally provided:determining a real time vector difference between the echo signals of two pulses successively emitted at predetermined time intervals;using said difference signal as an information signal for ultrasonic imaging. A thermoconductive intermediate member is interposed between a base table and a substrate support table and has a communication aperture path for communicating the aperture path of the base table with the aperture path of the substrate support table.