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A study on imaging of thermal properties of the skin

皮肤热特性成像研究

基本信息

批准号：
09480251
负责人：
TOGAWA Tatsuo
金额：
$ 5.57万
依托单位：
Tokyo Medical and Dental University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (B)
财政年份：
1997
资助国家：
日本
起止时间：
1997 至 1999
项目状态：
已结题

项目摘要

The aim of this study is to develop a non-contact imaging system of emissivity and thermal inertia of the skin. In this study, results as follows have been achieved. The system consists of a thermal camera and a hood covering the object surface in which the temperature of its inside is controlled so as to realize a step change of the surface radiation. The emissivity can be estimated from the apparent change of radiation, and the thermal inertia can be estimated from the slope of increasing object surface temperature. The estimations can be performed at each pixel so that images of emissivity and thermal inertia of skin can be obtained. Observed emissivities were consistent with other measurement data including that of ours using high precision spot radiometer. Thermal inertia values were also consistent with other reports. Parallel relation between thermal inertia and blood flow of the skin was also observed. As an application of this method, the change in thermal inertia before and after arterial occlusion was studied, and we found that non-uniform thermal inertia image was observed together with a reactive hyperemia. This fact suggests that blood flow distribution just after an arterial occlusion is non-uniform. While the system could be used for such physiological studies, improvements of the measurement system were attempted so as to apply in clinical diagnosis. A modified system was proposed in that a radiation source with a mechanical shutter placed distant from the object is used instead of the hood. A preliminary study showed that the method is quite promising. Relating to this measurement principle and configuration of the system, a patent was applied.

本研究的目的是开发一种非接触式的皮肤发射率和热惯性成像系统。在本研究中，取得了以下成果。该系统由一个热像仪和一个覆盖在物体表面的罩组成，罩中控制物体内部的温度，以实现表面辐射的阶跃变化。发射率可以根据辐射的表观变化来估计，热惯量可以从物体表面温度增加的斜率来估计。可以在每个像素上进行估计，从而可以获得皮肤的发射率和热惯性的图像。观测到的发射率与其他测量数据一致，包括我们使用高精度光斑辐射计的测量数据。热惯量值也与其他报告一致。还观察到皮肤的热惯性和血流之间的平行关系。作为该方法的应用，研究了动脉闭塞前后热惯量的变化，发现动脉闭塞前后热惯量图像不均匀，并伴有反应性充血。这一事实表明，动脉闭塞后的血流分布是不均匀的。在此基础上，对测量系统进行了改进，使其应用于临床诊断。提出了一种改进的系统，其中使用了远离物体放置机械快门的放射源，而不是引擎盖。初步研究表明，这种方法是很有前途的。关于该系统的测量原理和配置，申请了专利。