Optical vascular function imaging system and method for...

A - Human Necessities – 61 – K

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A61K 49/00 (2006.01)

Patent

CA 2554078

An in vivo optical imaging system and method of identifying unusual vasculature associated with the angiogenic vasculature in tumors. An imaging system acquires images through the breast. Benign, noninvasive oxygen and carbon dioxide are used as vasoactive agents and administered by inhalation to stimulate vascular changes. Images taken before and during inhalation are subtracted. An optical vascular functional imaging system monitors abnormal vasculature through optical measurements on oxy- and deoxy~hemoglobin during inhalation of varying levels of O2 and CO2. The increase in contrast between tumor (cancerous) and normal (noncancerous) tissue is dramatic, facilitating accurate early detection of cancerous tumors and improving sensitivity and specificity (lower false negative and false positive rates). The invention is useful in mammography, dermatology, prostate imaging and other optically accessible areas.

L'invention concerne un système et un procédé d'imagerie optique in vivo permettant d'identifier une vascularisation inhabituelle associée à la vascularisation angiogénique dans les tumeurs. Un système d'imagerie acquiert des images mammographiques. Des agents vasoactifs bénins non invasifs tels que l'oxygène et l'anhydride carbonique sont administrés par inhalation afin de stimuler des altérations vasculaires. Les images prises avant et pendant l'inhalation sont soustraites. Un système d'imagerie fonctionnelle vasculaire optique surveille la vascularisation anormale par le biais de mesures optiques de l'oxy- et de la désoxyhémoglobine pendant l'inhalation de concentrations variables d'O¿2 ?et de CO¿2?. L'augmentation de contraste entre le tissu tumoral (cancéreux) et le tissu normal (non cancéreux) est saisissante, ce qui facilite la détection précoce et précise des tumeurs cancéreuses tout en améliorant la sensibilité et la spécificité (taux inférieurs de faux négatifs et de faux positifs). L'invention est utile en mammographie, dermatologie, imagerie de la prostate et imagerie d'autres régions optiquement accessibles.

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