Comput. Biol. Med. - Lock-in thermal imaging for the early-stage detection of cutaneous melanoma: a feasibility study.

Tópicos

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Resumo

This paper theoretically evaluates lock-in thermal imaging for the early-stage detection of cutaneous melanoma. Lock-in thermal imaging is based on the periodic thermal excitation of the specimen under test. Resulting surface temperature oscillations are recorded with an infrared camera and allow the detection of variations of the sample's thermophysical properties under the surface. In this paper, the steady-state and transient skin surface temperatures are numerically derived for a different stage of development of the melanoma lesion using a two-dimensional axisymmetric multilayer heat-transfer model. The transient skin surface temperature signals are demodulated according to the digital lock-in principle to compute both a phase and an amplitude image of the lesions. The phase image can be advantageously used to accurately detect cutaneous melanoma at an early stage of development while the maximal phase shift can give precious information about the lesion invasion depth. The ability of lock-in thermal imaging to suppress disturbing subcutaneous thermal signals is demonstrated. The method is compared with the previously proposed pulse-based approaches, and the influence of the modulation frequency is further discussed.

Resumo Limpo

paper theoret evalu lockin thermal imag earlystag detect cutan melanoma lockin thermal imag base period thermal excit specimen test result surfac temperatur oscil record infrar camera allow detect variat sampl thermophys properti surfac paper steadyst transient skin surfac temperatur numer deriv differ stage develop melanoma lesion use twodimension axisymmetr multilay heattransf model transient skin surfac temperatur signal demodul accord digit lockin principl comput phase amplitud imag lesion phase imag can advantag use accur detect cutan melanoma earli stage develop maxim phase shift can give precious inform lesion invas depth abil lockin thermal imag suppress disturb subcutan thermal signal demonstr method compar previous propos pulsebas approach influenc modul frequenc discuss

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