moorLDI2 Models

The moorLDI2™ is still the most popular and versatile laser Doppler imaging system, equally at home in clinical and research environments. However, since its release there have been a number of requests from various clinicians and researchers asking for a bespoke solution to their imaging needs. These variations from the standard product are now available to all customers. The full range includes:-

moorLDI2-IR™ This is Moor Instruments’ Standard blood flow imager. As a direct result of employing a 2mW near infra red laser scanning beam, it is highly sensitive, has a wide dynamic range , high resolution and can be operated in fast or slow scan modes (for even higher sensitivity and greater dynamic range). In fast scan mode the time for 256 x 256 scan measurements is about 5 minutes. The default upper bandwidth of the signal (Doppler frequency shift) processor is 15kHz, so that in fast scan mode the range of red blood cell speeds that contribute to the recorded image is about 0.075mm/s to 6mm/s. In its slow mode, appropriate for imaging very low flows the range is about 0.01mm/s to 6mm/s. The MoorLDI uses a 12bit A/D in the signal processor plus amplifier gain settings of x4 and x16 which enables the accurate imaging of these very low flow areas in slow scan mode. ( The processor effectively works as a low noise 16 bit system.)

The infrared beam is combined with a visible red aiming beam which, after powering on the instrument, is always present. The infrared beam is only present for measurement and at other times, eg during the setup of the system, is effectively switched off. The near infrared beam has good remittance (return of the laser light from the tissue to the detectors in the imager) for both white and dark skin.

moorLDI2-HIR™ The moorLDI2-HR blood perfusion imager offers the highest spatial resolution of all Moor imagers with 256 x 256 measurements at 100 microns resolution. A focussed laser beam of diameter less than 100 microns is used, together with high resolution encoders in the position control of the laser beam scanning mirror.

moorLDI2-2λ™ The moorLDI2 dual wavelength perfusion imagers offer scanning at two different wavelengths for assessing flow from differing microvascular beds. It allows simultaneous scanning at two wavelengths. The standard pair of laser wavelengths are visible red 633nm and near infra-red (NIR) 830nm

moorLDI2-VR™ Visible HeNe 633nm Standard System. Large/Small areas, best resolution 25 pixels per mm². Shorter wavelength offers a more superficial measurement.

moorLDI2-II™ This is a class 2 laser Doppler instrument wavelength 633nm and beam power less than 1 mW. This is about half the power of the moorLDI2-IR imager. The moorLDI2-II is best used for imaging blood flow in areas of skin up to 30cm x 30cm, as the lower beam power results in a sensitivity which is about 25% that of the of the moorLDI2-IR 785nm 2mW laser Doppler imager. (Note that the moorLDI2-IR has visible red aiming beam combined with the near infra-red measurement beam).