Measurement of the volume of a leg ulcer using a laser scanner

Effective management of leg ulcer healing depends on accurate and reliable measurements of wound size. Current techniques usually rely on estimates of surface area or circumference which do not fully describe the healing process. A novel instrument has been developed that is capable of measuring the variations in the surface contours (topography) of a solid object. Its primary application is to measure the size of a leg ulcer by scanning a laser displacement sensor over the affected area. There is no contact with the wound and scanning takes approximately 2 minutes to perform. Volume is calculated by subtracting the measured topography from one calculated using an algorithm to reconstruct a healthy leg surface. A study was carried out where patients had their ulcers scanned during their visits to the leg ulcer clinic. Data are presented from two venous leg ulcers showing the calculated volume reducing over time.