Micro vein enhancer with two lasers and two optical detectors configured for removing surface topology

A vein imager, for use in imaging subcutaneous veins beneath a skin surface of a patient, said vein imager comprising:

• a first laser configured to emit a beam of light at an infrared wavelength;
• a second laser configured to emit a beam of light at a human-visible wavelength;
• a combiner configured to coaxially align said beam of infrared light and said beam of human-visible light to form a single coaxial beam of light;
• a scanner configured to scan said coaxial beam of light in a pattern and onto the skin surface of the patient;
• a first photodetector being responsive to said infrared wavelength, said first photodetector configured to receive said infrared wavelength of light reflected from the patient as a contrasted image of subcutaneous veins formed by differential absorption and reflection by the subcutaneous veins and the surrounding tissue therein, and as surface reflection noise due to topology of the skin surface;
• said first photo detector further configured to output a first signal representing said contrasted image of the subcutaneous veins and the skin surface topology;
• wherein said second laser is configured to receive said first signal and to project said contrasted image, using said means for scanning, onto the skin surface in a first image frame;
• a second photo detector responsive to said human-visible wavelength, said second photo detector configured to receive said human-visible wavelength reflected from the skin surface and to output a second signal representing a contrasted image of the skin surface topology;
• means for subtracting said second signal from said first signal to remove the noise from the skin surface topology and form a third signal representing a surface-noise-free contrasted image of the subcutaneous veins;
• and
• wherein said second laser is configured to receive said third signal and to project said surface-noise-free contrasted image, using said means for scanning, onto the skin surface in one or more images frames after said first image frame.