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Ultrasonic diagnosis of the maxillary diseases by reflection method was investigated.The following results were obtained.1) The applicable frequencies of the sound wave are 5 megacycles per second (gain: maximum, pulse breadth: 5.0-6.0μs) or 2.25 megacycles. (gain: maximum, pulse breadth: 2.0μs)2) The mean of attenuation constant of the anterior wall of the maxillary sinus is 14.8±4.2db and it increases in proportion to the bone thickness.3) As the normal maxillary sinus involves the air, the ultrasound can not reach to the posterior wall. The echogram showed no intrasinusal echo except the multiple echoes from the anterior wall.4) The echogram of sinusitis showed the bottom echo, if the sinus is filled with exsudat, polyp or inflammatory tissues. But the detection of the bottom echo depends chiefly on the angle ratio of the anterior and posterior wall of the maxillary sinus and on the distance between them.5) The benign tumors and postoperative cystes showed only the surface and the bottom echoes. On the other hand, carcinoma and sarcoma of the maxilla showed irregular echoes reflecting from the malignant tissues.6) The spreading area of malignant tumors determined by this method.7) The radiation effect on malignant tumors investigate by comparison of the echograms before and after radiation.

A STUDY ON THE DIAGNOSIS OF THE MAXILLARY DISEASES BY USING PULSED ULTRASOUND