Apparatus for measuring blood flow
AssigneeKowa Company, Ltd.
InventorsKoji Katayama, Ayafumi Taniji, Muneharu Ishikawa
Life of this patent
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Abstract
An apparatus for measuring blood flow repeatedly segmentally scans a region of in vivo tissue with a coherent light beam. Each scanning segment comprises a scanning period during which the light beam is scanned and a rest period during which the light beam is not scanned. During the rest period, the light beam is directed at a measuring point of the in vivo tissue. Measurement data is obtained dependent on the intensity of scattered light from the measurement point. The measurement data is time series data of chronological changes in the intensity of scattered light caused by blood in the in vivo tissue. The blood flow rate is calculated from frequency-analysis of the time series data.
Claims19
An apparatus for measuring blood flow comprising:
- intermittent scanning means for repeatedly carrying out segmental scans each consisting of a period during which a segment of a prescribed two-dimensional plane of an in vivo tissue is spatially scanned with coherent light and a rest period during which coherent light is directed at a measurement point of the in vivo tissue;
- measuring means for, during the rest period of each segmental scan, measuring time series data relating to intensity of scattered light from the measurement point in the in vivo tissue;
- and
- calculating means for calculating data relating to blood within the in vivo tissue from the time series data by frequency analyzing the time series data and calculating blood-flow information dependent on a frequency spectrum derived from the frequency-analyzation.
An apparatus for measuring blood flow, comprising:
- scanning means for segmentally scanning in vivo tissue with a light beam, each scanning segment comprising a scanning period during which the in vivo tissue is scanned with the light beam, and a rest period during which the in vivo tissue is not scanned and the light beam is directed at a measurement point of the in vivo tissue;
- and measuring means for measuring measurement data derived from intensity fluctuations of a speckle pattern obtained from the measurement point during the rest period.
An apparatus for measuring blood flow, comprising:
- scanning means for repeated segmental scanning of a region of in vivo tissue with a coherent light beam, each scanning segment comprising a scanning period during which the in vivo tissue is scanned with the light beam, and a rest period during which the in vivo tissue is not scanned and the light beam is directed at a measurement point of the in vivo tissue;
- measuring means for measuring measurement data dependent on the intensity of scattered light from the measurement point, the measurement data being time series data of chronological changes in the intensity of scattered light caused by particles in blood in the in vivo tissue;
- and calculating means for calculating the flow rate of blood in the in vivo tissue from frequency analysis of the time series data.
Dependencies are inferred from the claim text.