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| Untersuchte Arbeit: Seite: 22, Zeilen: 1ff (komplett) |
Quelle: Moor instruments 2006 Seite(n): 2, 3, Zeilen: 2: letzte Zeilen; 3: 1ff |
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| Both large areas (a full torso) and small areas (part of a finger) can be scanned, enabling the blood flow to be mapped and colour coded images of the blood flow displayed. Regions of interest can be defined and statistical data can be calculated and recorded.
Single point measurements give a high temporal resolution (40Hz data rates are typical) enabling rapid blood flow changes to be recorded, whereas the laser Doppler imager can provide spatial information and has the ability to average blood flow measurements over large areas. Fibre optic systems can measure at tissue sites not easily accessible to a laser beam. For example measurements in brain tissue, mouth, gut, colon, muscle and bone. 5.3. The definition of perfusion units The term commonly used to describe blood flow measured by the laser Doppler technique is ‘flux’: a quantity proportional to the product of the average speed of the blood cells and their number concentration (often referred to as blood volume). This is expressed in arbitrary ‘perfusion units’ and is calculated using the first moment of the power spectral density. |
Both large areas (a full torso) and small areas (part of a finger) can be scanned enabling the blood flow to be mapped and colour coded images of the blood flow displayed. Regions of interest can be defined and statistical data calculated and recorded.
[Seite 3] Single point measurements give a high temporal resolution (40Hz data rates are typical) enabling rapid blood flow changes to be recorded, whereas the laser Doppler imager can provide spatial information and has the ability to average blood flow measurements over large areas. Fibre optic systems can measure at tissue sites not easily accessible to a laser beam. For example measurements in brain tissue, mouth, gut, colon, muscle and bone. [...] Definitions The term commonly used to describe blood flow measured by the laser Doppler technique is ‘flux’: a quantity proportional to the product of the average speed of the blood cells and their number concentration (often referred to as blood volume). This is expressed in arbitrary ‘perfusion units’ and is calculated using the first moment of the power spectral density. |
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