RATE OF TEMPERATURE INCREASE IN HUMAN MUSCLE DURING 1 MHZ AND 3 MHZ CONTINUOUS ULTRASOUND
RATE OF TEMPERATURE INCREASE IN HUMAN MUSCLE DURING 1 MHZ AND 3 MHZ CONTINUOUS ULTRASOUND
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DOI：
10.2519/jospt.1995.22.4.142
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发表时间：
1995-10-01
影响因子：
6.1
通讯作者：
CASTEL, D
中科院分区：
文献类型：
--
作者：
DRAPER, DO;CASTEL, JC;CASTEL, D
为了实现超声波的热效应，组织温度必须从1℃提高到大于或等于4℃，这取决于所需的治疗结果。在过去的25年中，没有任何体内研究测量了1 mhz超声治疗期间的温度变化率，也没有任何研究使用3 mhz频率进行。因此，关于超声治疗的时间长短，我们只能进行纯粹的推测。我们进行这项研究是为了绘制在不同强度和频率的超声治疗期间温度升高的速率。我们将两个23号热敏电阻插入每个受试者的内侧三头肌表面，深度如下：1 MHz深度为2.5和5.0 cm（12名受试者），3 MHz深度为。8和1.6 cm（12名受试者）。每位受试者共接受4次10分钟的治疗，每次治疗1次。5、1.0、1.5和2.0 W/cm(2)，每30秒测量一次温度。在相同频率和剂量水平下，两个深度的升温速率无显著差异（p = .987）。在所有测试剂量下，3 mhz频率的加热速度明显快于1 mhz频率（p < 0.001）。平均而言，在1 mhz频率的两个深度每分钟的升温速率为：。摄氏04度。5 W / cm (2);．16℃1.0 W/cm(2)；．33℃，1.5 W/cm(2)；和。38℃，2.0 W/cm(2)。在3-MHz频率的两个深度，每分钟的升温速率为：。摄氏3度。5 W / cm (2);．58℃1.0 W/cm(2)；．89℃，1.5 W/cm(2)；2.0 W/cm(2)的温度为1.4℃。本研究结果应使临床医生在使用热超声时选择正确的频率、强度和治疗时间。
To achieve the thermal effects of ultrasound, the tissue temperature must be raised from 1 to greater than or equal to 4 degrees C, depending on the desired outcome of the treatment. In the past 25 years, there have been no in vivo studies that have measured rate of change in temperature during 1-MHz ultrasound treatments, and none have ever been performed with the 3-MHz frequency. Thus, we are left to pure speculation regarding how long to administer an ultrasound treatment We performed this study to plot the rate of temperature increase during ultrasound treatments delivered at various intensities and frequencies. We inserted two 23-gauge thermistors into each subjects' medial triceps surae at the following depths: 1 MHz at depths of 2.5 and 5.0 cm (12 subjects) and 3 MHz at depths of .8 and 1.6 cm (12 subjects). Each subject received a total of four 10-minute treatments, one each at .5, 1.0, 1.5, and 2.0 W/cm(2), and temperature was measured every 30 seconds. No significant difference was found in the rate of heating at the two depths (p = .987) within the same frequency and dose levels. The 3-MHz frequency heated significantly faster than the 1-MHz frequency at all doses tested (p < .001). On average, the rate of temperature increase per minute at the two depths of the 1-MHz frequency was: .04 degrees C at .5 W/cm(2); .16 degrees C at 1.0 W/cm(2); .33 degrees C at 1.5 W/cm(2); and .38 degrees C at 2.0 W/cm(2). The rate of temperature increase per minute at the two depths of the 3-MHz frequency was: .3 degrees C at .5 W/cm(2); .58 degrees C at 1.0 W/cm(2); .89 degrees C at 1.5 W/cm(2); and 1.4 degrees C at 2.0 W/cm(2). The results of this research should enable clinicians to choose the correct frequency, intensity, and treatment time when using thermal ultrasound.