光學(xué)體積描記術(shù)
The amplitude ratio of the photoplethysmography waveform of red light and infrared light varies with the oxygen saturation of blood. 脈搏血氧儀具有連續(xù)、無(wú)創(chuàng)、快速、準(zhǔn)確監(jiān)測(cè)人體動(dòng)脈血氧飽和度和心率的功能，現(xiàn)已在臨床上發(fā)揮重要作用[1]。
In the present article, the approach of dynamic spectrum （DS） is in troduced, which is based on the principle of photoplethysmography. 在近紅外光譜檢測(cè)法所面臨的諸多問(wèn)題中，個(gè)體差異和檢測(cè)條件對(duì)光譜測(cè)量的影響，是突出的技術(shù)問(wèn)題。
How to eliminate the effects of the noises while correctly extract the photoplethysmography is one of the key tasks to improve the accuracy and reliability of the instrument. 消除測(cè)量系統(tǒng)中各種干擾的影響,設(shè)法正確地檢出光電容積脈搏波信號(hào)是關(guān)系到測(cè)量系統(tǒng)準(zhǔn)確性及其精度的關(guān)鍵問(wèn)題之一。
Objectives To assess the scope of photoplethysmography (PPG), color duplex ultrasonography, percutaneous transpopliteal venography for evaluating chronic venous disease. 目的了解雙功彩超、經(jīng)皮腘靜脈穿刺造影、光電容積描記（PPG）在檢測(cè)下肢靜脈倒流中的優(yōu)缺點(diǎn)及相對(duì)適應(yīng)證。
Objective To analyse pulse transit time variability (PTTV) in frequency domain and to study the physiological interpretation of PTTV. Methods Pulse transit time (PTT) was obtained by ECG and PPG (photoplethysmography) from 187 subjects. 目的分析脈搏波傳導(dǎo)時(shí)間變異性(pulse transit time variability,PTTV),研究PTTV的生理意義。
