Measuring hemodynamics using a mini laser Doppler blood flowmeter for assessing the cardiovascular regulatory ability

Masaki Goma, Yoshinori Kimura

A mini laser Doppler flowmeter (miniLDF) is capable of non-invasive measurement, free of artifact noise, small, and wearable. Visualization of the human physiological response to external environmental stress is an important use of the biological sensor. In this study, we examined the hemodynamics during orthostatic stress by measuring the earlobe blood flow (EBF) using a mini LDF in healthy subjects. After standing, EBF revealed a transient decreasing and recovering response that was synchronized with arterial blood pressure (ABP), and each recovery time was comparable. These results suggest that the regulatory ability of ABP on the basis of autonomic function can be evaluated with EBF measurement. Our new approach may be utilized to assess the cardiovascular regulatory ability.

See-Through Projection System

Takanobu Higuchi, Takamasa Yoshikawa, Hirokazu Hashikawa, Manabu Akagi, Tatsuya Yoshizawa, Keisuke Iwawaki, Yuji Ito, Hiroshi Kogoma, Nobuhiko Saegusa

We developed a new display system, " See-through projection system" , consist of a projector and a transparent screen. Our system can be seen both bright images on the screen and the background images through the screen. We introduce prototypes and applications of See-through projection system.

Development of an image sensor using radiation-tolerant active-matrix HEED

Kazuto Sakemura, Shutetsu Akiyama, Tomonari Nakada, Atsushi Watanabe, Jun Aizawa, Masashi Otsuka, Kunihisa Ishii, Katsumi Yoshizawa

Active-matrix high-efficiency electron emission device (HEED), cold cathode, makes it possible to provide an image sensor by pairing with a photoconductive film. In this study, we improved the radiation-tolerance of active matrix HEED. By pairing the radiation-tolerant active-matrix HEED with the high-gain avalanche rushing amorphous photoconductor (HARP), ultrahigh-sensitivity photoconductive film, we developed the radiation-tolerant HEED-HARP imaging sensor. The image sensor worked continuously in the environment of gamma ray irradiation, the dose rate at 480Gy/h, the total dose up to 21kGy. Additionally, we studied the feasibility of radiation-tolerance improvement of active-matrix HEED and the reduction of noise by using amorphous silicon photoconductive film instead of the HARP photoconductive film. As a result, we got the prospect of our radiation-tolerant image sensor improvement.

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