翻訳と辞書 Words near each other ・ Photograph 51 (play) ・ Photograph album ・ Photograph conservator ・ Photograph of Mary ・ Photograph Smile ・ Photographer ・ Photographer (disambiguation) ・ Photographer (film) ・ Photographer of Dreams ・ Photographers of the African-American Civil Rights Movement ・ Photographers of the American Civil War ・ Photo-story ・ Photoablation ・ Photoacoustic Doppler effect ・ Photoacoustic effect ・ Photoacoustic imaging ・ Photoacoustic spectroscopy ・ Photoacoustic tomography ・ Photoactivatable fluorescent protein ・ Photoactivatable probes ・ Photoactivated localization microscopy ・ Photoactivated peptide ・ Photoactive layer ・ Photoaffinity labeling ・ Photoaging ・ Photoalbum (album) ・ Photoanalysis ・ Photoanimation ・ Photoassimilate ・ Photobacterium Dictionary Lists mini英和辞書 mini和英辞書 Webster 1913 Latin-English FOLDOC Wikipedia English ウィキペディア

翻訳と辞書　辞書検索 [ 開発暫定版 ] スポンサード リンク Photoacoustic imaging ： ウィキペディア英語版 Photoacoustic imaging Photoacoustic (optoacoustic) imaging, as a hybrid biomedical imaging modality, is developed based on the photoacoustic effect. In photoacoustic imaging, non-ionizing laser pulses are delivered into biological tissues (when radio frequency pulses are used, the technology is referred to as thermoacoustic imaging). Some of the delivered energy will be absorbed and converted into heat, leading to transient thermoelastic expansion and thus wideband (i.e. MHz) ultrasonic emission. The generated ultrasonic waves are detected by ultrasonic transducers and then analyzed to produce images. It is known that optical absorption is closely associated with physiological properties, such as hemoglobin concentration and oxygen saturation. As a result, the magnitude of the ultrasonic emission (i.e. photoacoustic signal), which is proportional to the local energy deposition, reveals physiologically specific optical absorption contrast. 2D or 3D images of the targeted areas can then be formed. Fig. 1 is a schematic illustration showing the basic principles of photoacoustic imaging. The optical absorption in biological tissues can be due to endogenous molecules such as hemoglobin or melanin, or exogenously delivered contrast agents. As an example, Fig. 2 shows the optical absorption spectra of oxygenated hemoglobin (HbO2) and deoxygenated hemoglobin (Hb) in the visible and near infrared region.〔(Optical Properties Spectra )〕 Since blood usually has orders of magnitude higher absorption than surrounding tissues, there is sufficient endogenous contrast for photoacoustic imaging to visualize blood vessels. Recent studies have shown that photoacoustic imaging can be used ''in vivo'' for tumor angiogenesis monitoring, blood oxygenation mapping, functional brain imaging, skin melanoma detection, methemoglobin measuring, etc. ==Advantages== 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Photoacoustic imaging」の詳細全文を読む スポンサード リンク 翻訳と辞書 : 翻訳のためのインターネットリソース Copyright(C) kotoba.ne.jp 1997-2016. All Rights Reserved.