Laser Doppler Blood Flow Meter

Applications of laser doppler flowmetry 1.

Laser doppler blood flow meter. The probes come in different sizes for different applications and are suitable for acute and chronic procedures. Laser doppler velocimetry also known as laser doppler anemometry is the technique of using the doppler shift in a laser beam to measure the velocity in transparent or semi transparent fluid flows or the linear or vibratory motion of opaque reflecting surfaces. In normal skin when using perimed laser doppler instruments a probe with standard fiber separation 0 25 mm and a 780 nm wavelength laser the typical measurement depth will be in the order of 0 3 0 5 millimeter with a small part of the signal being affected by blood flow at 1 mm and more. In recent papers this technique has been used to measure microflow in standardized fluid models in animals and in human clinical situations.

Biopac data acquisition systems and amplifiers provide a range of solutions for laser doppler flow studies. The ldf100c amplifier has a variety of flow probes styles including. I use laser doppler imaging in quantifying cerebral blood flow in stroke and traumatic brain injury research. A single channel laser doppler flowmeter used with a specialized fiber optic probe purchased separately to measure blood cell perfusion in the microvasculature of tissues and organs.

Having used other methods to determine effect of stroke or brain injury on cerebral perfusion and blood flow like microspheres cranial window probes the laser doppler imager is easier to use does not involve any invasive or. The ldf module is easily combined with other biopac physiological. During cardiac surgery it is necessary to make sure there is a constant blood flow to the heart. Since the measurement is direct here a fiber optic cable can be held close to the blood vessel to detect the reflected light.

It has been observed that ultrasonic doppler blood flow meters accounted for the largest market share approximately 52 of the overall blood flow measurement products market in 2012. The blood flowmeter supports invasive and or non invasive specialist disciplines with a range of probe types and probe formats. Laser doppler flowmetry ldf is a new non invasive technique by which microcirculation changes in tissue can be studied. A 0 5 to 1 mm diameter fiberoptic laser probe is placed in contact with or within brain tissue and conducts reflected light back to a photodetector within the flowmeter sensor.

The measurement with laser doppler anemometry is absolute and linear with velocity and requires no pre calibration. Laser doppler flowmetry allows continuous real time measurement of local microcirculatory blood flow. The measurement depth is less in blood rich. Further the product segment of blood flow measurement devices market has been segmented into ultrasonic doppler laser doppler and electromagnetic.