Gramlich B, Fröhlich P, Richter J
Z Exp Chir. 1979;12(3):181-7.
The echogram from bones in vivo or in model trials consists of the echoes of bones and soft tissues. Under certain conditions, the fore part of this echogram (total echogram) consists of bone echoes only, the intermediate part of echoes from bone and soft tissue with perhaps different amplitudes, whereas the hind part contains only soft tissue echoes. When frequency and distance of the sound head are too high the fore part might be absent, that is when the distance of the sound head becomes larger than 60 mm at a frequency of 1 MHz and a sound head diameter of 30 mm. The amplitude of soft tissue echoes in the intermediate part of the total echogram at greater distances can be higher than the amplitudes of the bone echoes. A definite valuation of these bone echoes by electronic suppression of the total echogram is impossible in that case. For these reasons, controlling the course of fracture healing by help of conventional ultrasonic devices with a frequency of 1 MHz is more difficult than supposed hitherto.
体内或模型试验中骨骼的回波图由骨骼和软组织的回波组成。在某些情况下，该回波图（总回波图）的前部仅由骨骼回波组成，中间部分是来自骨骼和软组织的回波，其幅度可能不同，而后部仅包含软组织回波。当探头的频率和距离过高时，前部可能会缺失，即在1MHz频率和30mm探头直径下，当探头距离大于60mm时。在总回波图中间部分，更远距离处软组织回波的幅度可能高于骨骼回波的幅度。在这种情况下，通过电子抑制总回波图来对这些骨骼回波进行明确评估是不可能的。由于这些原因，借助频率为1MHz的传统超声设备来控制骨折愈合过程比迄今为止想象的要困难。
