Egot-Lemaire Stéphane J-P, Ziskin Marvin C
Center for Biomedical Physics, Temple University Medical School, Philadelphia, PA 19410, USA.
Bioelectromagnetics. 2011 Jul;32(5):360-6. doi: 10.1002/bem.20650. Epub 2011 Jan 31.
The reason for using acupuncture points as exposure sites in some applications of millimeter wave therapy has been unclear. Acupuncture points have been suspected to exhibit particular direct current (DC), low-frequency electrical and optical properties compared to surrounding skin. To assess if such a biophysical correlation could exist at millimeter wave frequencies used in the therapy, we investigated the dielectric properties of an acupuncture point on the forearm skin within the 50-75 GHz range. These properties were compared with those of a neighboring ipsilateral control area and a corresponding contralateral control area. The complex reflection coefficient at the end of an open-ended rectangular waveguide loaded with a Teflon plug was measured with a vector network analyzer. A suitable model of the aperture admittance was used to calculate the dielectric properties of the skin at the measured spots. Statistical analyses were conducted with an ANOVA to compare the three sites. From these analyses, the dielectric properties of the acupuncture site were found to be somewhat different from those of surrounding non-acupuncture sites from 50 to about 61 GHz, in the case of the real part of the complex permittivity.
在毫米波疗法的某些应用中,将穴位作为暴露部位的原因尚不清楚。与周围皮肤相比,穴位被怀疑具有特殊的直流(DC)、低频电学和光学特性。为了评估在该疗法所使用的毫米波频率下是否可能存在这种生物物理相关性,我们研究了前臂皮肤一个穴位在50 - 75 GHz范围内的介电特性。将这些特性与同侧相邻对照区域和相应对侧对照区域的特性进行了比较。使用矢量网络分析仪测量了装有聚四氟乙烯插头的开放式矩形波导末端的复反射系数。采用合适的孔径导纳模型来计算测量点处皮肤的介电特性。使用方差分析进行统计分析以比较这三个部位。从这些分析中发现,在复介电常数实部方面,穴位的介电特性在50至约61 GHz范围内与周围非穴位部位的介电特性有所不同。