Development of non-invasive temperature measurement system for continuous monitoring of deep brain temperatures

开发连续监测深部脑温度的无创温度测量系统

• 批准号: 13650460
• 负责人: SUGIURA Toshifumi
• 金额: $ 2.24万
• 依托单位: Shizuoka University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (C)
• 财政年份: 2001
• 资助国家: 日本
• 起止时间: 2001 至 2004
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-13650460/
• 关键词: microwave radiometry; hypothermia; newborn baby; brain temperature; non-invasive measurement; hypoxia; weighting function; brain; 低体温療法; 脳; 脳内温度分布; マイクロ波ラジオメトリ; 脳内電磁界解析; 信頼区間; 脳機能障害; ラジオメトリ; 脳内電磁解析; 脳障害後遺症; ラジオメータ; 熱雑音; 較正実験

It has been shown that cooling the brain of newborn baby after hypoxia-ischemia can reduce damage and improve functional outcome. Clinical trials are, however, currently hindered by the difficulty in measuring brain temperature non-invasively. Microwave radiometry has been proposed and developed as a non-invasive technique for brain temperature measurement at Shizuoka University. The radiometer system detects the very weak spontaneous electromagnetic radiation from inside the brain by a waveguide antenna placed on the head surface and amplifies them with five receivers operating at center frequencies of 1.2, 1.65, 2.3, 3.0 and 3.6 GHz. The system also includes two lock-in amplifiers, control circuit, reference noise source, and the temperature retrieval algorithm.Among the five receivers, 2.3, 3.0 and 3.6 GHz receivers have been added to the 1.2 and 1.65 GHz receivers that were previously made, and a control program for the whole system has been developed. In addition to those, several … More circuits such as buffer circuits, constant voltage/current circuits, supply circuits, etc. were manufactured. In order to operate stably not in a shielded room but in a normal room, several countermeasures for reducing background noises and thermal fluctuation have been made to the system. After such improvements, the system became stable in a normal room, and a calibration experiment could be done using a waveguide antenna. Temperature resolutions for the five receivers were 0.183, 0.273, 0.148, 0.108, 0.118 ℃. New radiometric weighting functions were also obtained from baby's MRI data. Confidence interval at the brain center was estimated by the temperature retrieval simulation method, which also developed for the evaluation of the system, using the obtained resolutions and a temperature shape function in a baby's head. The interval thus obtained was about 0.3 ℃. This result was satisfactory in comparison with the target value of 1 ℃. Manufacturing the temperature distribution phantom of a baby's head and the further countermeasures for stabilization of the system for temperature measurement experiment are now underway. Less

研究表明，在缺氧缺血后冷却新生儿的大脑可以减少损伤并改善功能结果。然而，目前临床试验因难以非侵入性测量脑温度而受到阻碍。静冈大学提出并开发了微波辐射测量作为脑部温度测量的非侵入性技术。辐射计系统通过放置在头部表面的波导天线检测来自大脑内部的非常微弱的自发电磁辐射，并用五个以 1.2、1.65、2.3、3.0 和 3.6 GHz 中心频率工作的接收器将其放大。该系统还包括两个锁相放大器、控制电路、参考噪声源和温度检索算法。五个接收机中，在之前制作的1.2和1.65 GHz接收机的基础上增加了2.3、3.0和3.6 GHz接收机，并开发了整个系统的控制程序。除此之外，还制造了缓冲电路、恒压/恒流电路、电源电路等多种电路。为了不在屏蔽室中而是在普通室中稳定运行，系统采取了多种降低背景噪声和热波动的对策。经过这样的改进，系统在正常房间内变得稳定，并且可以使用波导天线进行校准实验。五个接收器的温度分辨率分别为0.183、0.273、0.148、0.108、0.118 ℃。新的辐射加权函数也从婴儿的 MRI 数据中获得。大脑中心的置信区间是通过温度检索模拟方法估计的，该方法也是为了评估系统而开发的，使用所获得的分辨率和婴儿头部的温度形状函数。由此获得的间隔约为0.3℃。与1℃的目标值相比，这个结果是令人满意的。婴儿头部温度分布模型的制作以及测温实验系统稳定性的进一步对策正在进行中。较少的

项目成果

A study of the influence of tissue conductivity for microwave radiometric weighting functions in non-invasive measurement of baby's brain temperature

无创婴儿脑温测量中组织电导率对微波辐射加权函数影响的研究

• 发表时间: 2002
• 期刊: Proceedings of 2002 IEEE Asia-Pacific Microwave Conference
• 作者: T.Sugiura;Y Kouno;A.Hashizume;H.Hirata;Y.Okita;M.Kimura;J.W.Hand;S.Mizushina;Toshifumi Sugiura;Toshifumi Sugiura
• 通讯作者: Toshifumi Sugiura

T.Sugiura, H.Hirata, K.Ohashi, et al.: "A study of the influence of tissue conductivity for microwave radiometric weighting functions in non-invasive measurement of baby's brain temperature"Proceedings of 2002 Asia-Pacific Microwave Conference. 1091-1094

T.Sugiura、H.Hirata、K.Ohashi 等人：“组织电导率对婴儿脑温度无创测量中微波辐射加权函数影响的研究”2002 年亚太微波会议论文集。

七種隆光, 北村 光, 平田 寿 他: "サンプルアンドホールド回路を用いた基準雑音源制御法"静岡大学電子工学研究所研究報告. 36巻. 123-127 (2003)

Takamitsu Nanagusa、Hikaru Kitamura、Hisashi Hirata 等：“使用采样保持电路的参考噪声源控制方法”静冈大学电子研究所研究报告，第 36 卷，123-127 (2003)。

K.Ohashi, K.Maruyama, H.Hirata, et al.: "One dimensional radiometiric weighting functions in 3D baby head models"Proceedings of JICAST'02. 211-214 (2002)

K.Ohashi、K.Maruyama、H.Hirata 等人：“3D 婴儿头部模型中的一维放射测量权重函数”JICAST02 论文集。

Development of a five-band microwave radiometer system for non-invasive measurement of deep brain temperature in new-born babies

开发五波段微波辐射计系统，用于无创测量新生婴儿深部脑温度

• 发表时间: 2002
• 期刊: Proceedings of 2002 IEEE Asia-Pacific Microwave Conference
• 作者: T.Sugiura;Y Kouno;A.Hashizume;H.Hirata;Y.Okita;M.Kimura;J.W.Hand;S.Mizushina;Toshifumi Sugiura
• 通讯作者: Toshifumi Sugiura