Temperature monitoring during photodynamic therapy of skin tumors with topical 5-aminolevulinic acid application

Arie Orenstein, Genady Kostenich, Haggai Tsur, Leonid Kogan, Zvi Malik

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    57 Scopus citations

    Abstract

    Temperature monitoring during photodynamic therapy (PDT) with topical 5-aminolevulinic acid (ALA) cream application was performed on 22 patients with solar keratoses (SK) and basal cell carcinoma (BCC). The lesions were located on the forehead, nose, ear and cheek. Temperature measurements during photoirradiation, with a power density of 100 mW/cm2 from an incoherent light source (light delivery system for PDT), were carried out by noncontact (infrared thermal imaging radiometer) and contact (thermocouple) methods. Thermal imaging analysis revealed nonuniform temperature distribution in the irradiated areas. The temperature gradually increased from the peripheral to the central zone of the area. The results showed that photoirradiation induced heating of the skin tumors to 39.5-42.5 °C during the PDT procedure. The temperature of normal skin areas disposed symmetrically to the lesions on the contralateral side at the same conditions of irradiation (without prior ALA application) was about 42-43.5 °C. The surface temperature differences (ΔT) between the normal and tumor tissues after 10 min of irradiation were 3.3 ± 0.5 °C in the forehead areas, 2.5 ± 0.4 °C in the nose areas and 0.8 ± 0.3 °C in the ear areas.

    Original languageEnglish
    Pages (from-to)227-232
    Number of pages6
    JournalCancer Letters
    Volume93
    Issue number2
    DOIs
    StatePublished - 13 Jul 1995

    Keywords

    • ALA
    • Basal cell carcinoma
    • Normal skin
    • Patient
    • Photodynamic treatment
    • Solar keratoses
    • Temperature
    • photoirradiation

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