整形外科領域における超音波の診断的応用

--とくに骨腫瘍について--

抄録

The diagnosis of bone and soft tissue diseases, especially bone tumor, was studied using the ultrasonic examination. The frequency of 2.25 MHz and a transducer of 10 mm diameter were used in this study. In case of normal bone, only its surface appeared while inside of bone appeared as a nonreflected transparent area according to the acoustic character. In the case of bone disease, it was observed that ultrasonic wave transmitted into the bone in response to the nature and grade of bone invasion and various abnormal echoes were able to be detected owing to the difference of acoustic structure in lesion area. In malignant tumor on the ultrasono-tomogram, destructive configuration of bone surface and strong irregular echoes were detected from the tumor region and bottom configuration was not clearly observed. On the contrary, benign tumor showed well kept bone surface and clear bottom configuration and inside of tumor appeared as transparent area. As the object of diagnosing soft tissue diseases especially soft tissue tumor by the ultrasonic method, abscess, lipoma, liposarcome, rhabdomyosarcome, and others were experienced and differentiation whether they were benign or malignant and also depth or size of tumors were able to be diagnosed and the ultrasonic examination by means of both A-Scope and the ultrasono-tomography was very useful. The development of immersion rotating compound scanning method was studied in order to increase the resolving power of ultrasono-tomograms. It is concluded that application of ultrasound is considered effective for diagnostic use in the field of orthopedic surgery. That is, diagnostic application of ultrasound is effective for the diagnosis of tumor in bone and soft tissue by the characteristic of ultrasonic tissue visualization.