Method and apparatus for diagnosis of skin lesions

A - Human Necessities – 61 – B

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A61B 5/103 (2006.01)

Patent

CA 2195292

A method and apparatus for determining skin lesion parameters comprise directing light to the skin in which the lesion is located and monitoring the reflection of that light. Then, the spatial and spectral distribution of the reflected light is analyzed. The depth is determined by finding a location where the difference between a spectral intensity of reflected light and an average reflected intensity is greater than a maximal difference between the intensity of each point and an average intensity for normal skin. The wavelength of the light reflected from the location is determined, and from the wavelength the penetration depth is determined. The penetration depth is also the depth of the lesion below the skin surface. The size is determined by determining a plurality of locations where the deviation between the spectral intensity and the average intensity is greater than the maximal deviation for normal skin. Based on the spatial distribution of the locations the size of the lesion is determined.

Méthode et appareil servant à mesurer les paramètres de lésions cutanées. Il s'agit de diriger une lumière sur la zone lésée et de surveiller la réflexion de cette lumière. Ensuite, on analyse la distribution spatiale et spectrale de la lumière réfléchie. La profondeur de la lésion est déterminée en localisant un endroit où la différence entre l'intensité spectrale de la lumière réfléchie et l'intensité moyenne réfléchie est supérieure à la différence maximale entre l'intensité de chaque point et l'intensité moyenne pour une peau normale. La longueur d'onde de la lumière réfléchie à l'endroit de la lésion est mesurée, et à partir de la longueur d'onde, on détermine la profondeur de pénétration. Celle-ci correspond aussi à la profondeur de la lésion sous la peau. La dimension est établie en déterminant plusieurs endroits où l'écart entre l'intensité spectrale et l'intensité moyenne est supérieur à l'écart maximal pour une peau normale. D'après la distribution spatiale des différents points, on mesure la dimension de la lésion.

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