To observe of problems with blood circulation in tissues it became easier. The new device of bioengineers from the Dutch small town Tvente can observe of rate of a blood flow in a regimen of real time.

Engineers from University Tvente in the Netherlands have framed the new device named TOPCam Twente Optical Perfussion Camera). She allows to watch non-invasively a blood flow in capillaries. And unlike the precursors the chamber allows to watch a blood flow in a regimen of real time in a site, the area 77 the Medical workers testing the device see, remained are happy with quality and rate of its work.

The principle of work of the chamber is well-known and is already used in similar devices. The investigated site is shined with the laser with a certain wavelength. Light gets under a skin and is reflected selectively from moving red bloody cells. Thanks to Dopler's effect the wavelength of reflected light varies depending on rate of movement of reflecting particles, this shift is fixed by means of the sensitive photodetector. And already on the basis of the received data rate of a blood flow is defined. It is curious, that is equal by the same principle to the farthest galaxies the distance is measured in the Universe.

Difference TOPCam from other devices using Dopler's effect, basically "illumination" of an investigated site. The narrow laser beam with the small area of section, as in a laser pointer is standardly used. This method allows or to fix changes of rate of a blood flow in a regimen of real time actually in a point, that is from a surface coinciding on the area with maculae of the laser, or to receive more extensive images, but for this purpose a laser beam "scans" an investigated site a point behind a point. And on blood flow registration on the area in 50 sq. sm some minutes are required to it.

In TOPCam more powerful laser and system of mirrors which "dilate" a laser fascicle till the necessary sizes on distance in 40 sm from a source are used. This distance convenient for observations. Reflected light is fixed by a sensitive matrix of a digital camera.

At observation in a regimen of real time the Dutch engineers managed to reach rates 1 shot in 5 seconds At record in memory of the device it is possible to write down "film" with frequency of change of shots to 26 times a second, the truth, only if "film" lasts no more than 4 seconds It is bound to complexity of processing of the arriving information. At reduction of the area of scanning duration of filming is enlarged proportionally, as well as at frequency reduction.