Results 281 to 290 of about 25,792 (294)
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2021
Photoacoustic imaging (PAI) is an emerging imaging modality that shows great potential for preclinical research and clinical practice. As a hybrid technique, PAI uniquely combines the advantages of optical excitation and of acoustic detection. Optical excitation provides a rich contrast mechanism from either endogenous or exogenous chromophores ...
Lin, Li, Wang, Lihong V.
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Photoacoustic imaging (PAI) is an emerging imaging modality that shows great potential for preclinical research and clinical practice. As a hybrid technique, PAI uniquely combines the advantages of optical excitation and of acoustic detection. Optical excitation provides a rich contrast mechanism from either endogenous or exogenous chromophores ...
Lin, Li, Wang, Lihong V.
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Photoacoustic lymphangiography
Journal of Surgical Oncology, 2019AbstractBackground and objectivesPhotoacoustic lymphangiography, which is based on photoacoustic technology, is an optical imaging that visualizes the distribution of light absorbing tissue components like hemoglobin or melanin, as well as optical absorption contrast imaging agents like indocyanine green (ICG) in the lymphatic channels, with high ...
Hiroki Kajita +8 more
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Medical Physics, 1994
Differential absorption has been detected and localized in three‐dimensions by recording the photoacoustic pulses that were produced when short‐duration (∼1 μs) pulses of electromagnetic energy were absorbed regionally within a turbid medium. These absorption sites were localized with a spatial resolution of ∼6 mm within a 20×20×7.5‐cm3 volume of 0.3 ...
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Differential absorption has been detected and localized in three‐dimensions by recording the photoacoustic pulses that were produced when short‐duration (∼1 μs) pulses of electromagnetic energy were absorbed regionally within a turbid medium. These absorption sites were localized with a spatial resolution of ∼6 mm within a 20×20×7.5‐cm3 volume of 0.3 ...
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Photoacoustic Spectroscopy — Photoacoustic and Photothermal Effects
1990Definition. Photoacoustic (PA) or optoacoustic measurements in the original, strict sense comprise the detection of acoustic waves which arise from non-radiative de-excitation (radiationless transition) of the sample as a consequence of absorption of continuously amplitude-modulated light.
C. Buschmann, H. Prehn
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Photoacoustic detection of HCl
Optics Letters, 1983A sensitive photoacoustic detection system for trace atmospheric measurements of HCl is described. The results reported here suggest the capability of measuring HCl at the 50-parts-in-10(9) level with a prototype laboratory system. Further system improvements and atmospheric-measurement considerations are discussed.
Alan Fried, Walter W. Berg
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A photoacoustical radiation dosimeter
Medical Physics, 1984A new type of radiation dosimeter using the photoacoustical effect is described. The photoacoustical radiation dosimeter (PARD) is capable of directly measuring the energy absorbed in the detecting element. For a completely absorbing element, the energy fluence rate in the radiation beam is measured. It is thus a calorimetric dosimeter.
H. Vargas, C. L. Cesar, S. Mascarenhas
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Photoacoustic spectroscopy of solids
The Journal of the Acoustical Society of America, 1973There are a great many substances, both organic and inorganic, that, because of their physical state, cannot be readily studied by conventional absorption or reflection techniques. In photoacoustic spectroscopy, light absorbed by the sample is converted into a measurable acoustic signal, and spectra closely corresponding to optical absorption spectra ...
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