Hendrich C, Jakob P M, Breitling T, Schäfer A, Berden A, Haase A, Siebert W E
Orthopädische Universitätsklinik, König-Ludwig-Haus, Würzburg.
Orthopade. 1996 Feb;25(1):17-20.
The aim of this study was the dynamic measurement, with magnetic resonance imaging, of temperature in cartilage irradiated by laser. Fresh specimens, each with chondromalacia grade II and III, were irradiated with a Holmium:YAG laser under MRI control. Temperature was measured by means of the proton-shift method, which allows high temporal and spatial resolution. With this method a maximum increase in temperature of 35 degrees was found after irradiation with 1.0 J and 10 Hz for 5 s at a distance of 1 mm. In no case at all was an increase in temperature of more than 10 degrees observed in the cartilage adjacent to the subchondral bone. These results exclude the possibility of significant thermal damage from laser treatment as described.
本研究的目的是利用磁共振成像动态测量激光照射软骨时的温度。在磁共振成像控制下，使用钬激光对新鲜的、软骨软化分级为II级和III级的标本进行照射。采用质子位移法测量温度，该方法具有高时间和空间分辨率。用此方法发现，在距离1毫米处，以1.0焦耳、10赫兹照射5秒后，温度最高升高35度。在任何情况下，均未观察到软骨下骨附近的软骨温度升高超过10度。这些结果排除了所述激光治疗造成显著热损伤的可能性。
