Multi-layer imaging of human organs by measurement of laser backscattered radiation.

Laser backscattered radiations from tissue phantoms and human forearms are measured by a reflectance imager. Laser radiations are guided by an optical fibre, and the backscattered radiations are collected by three optical fibres in the measurement probe assembly, placed at distances of 2 mm, 4 mm and 6 mm from the input fibre. By placing the measurement probe on the phantom or tissue surface and matching the outline on the computer monitor, the reflectance data from the organ or the phantom are collected. These data, after digitisation, interpolation and filtering, are colour coded and displayed on the computer monitor. Using this imaging procedure, the abnormalities embedded at different depths in the phantoms are located. The structural changes due to colour, composition and blood flow in the multi-layer of human forearms of various subjects are qualitatively shown in reflectance images obtained by this procedure.