Laser-induced fluorescence diagnostics of basal cell carcinomas of the skin following topical ALA application
(1996) Conference on Optical Biopsies and Microscopic Techniques, VIENNA, AUSTRIA, SEP 07-09, 1996 2926. p.32-40- Abstract
- Fourteen patients with superficial basal cell carcinomas (BCCs) and fifteen patients with nodular BCCs were investigated by means of laser-induced fluorescence (LIF) in connection with photodynamic therapy (PDT). Topical application of delta-amino levulinic acid (ALA) was performed six hours prior to the treatment session. Fluorescence spectra were recorded, using a point-monitoring system with an excitation wavelength of 405 nm. The measurements were performed in scans over the lesion and the surrounding normal skin before application of ALA, and immediately before and after the laser treatment. The selective uptake of the photosensitiser resulted in a fluorescence intensity ratio of 2.4:1 for superficial BCCs and 2.5:1 for nodular BCCs.... (More)
- Fourteen patients with superficial basal cell carcinomas (BCCs) and fifteen patients with nodular BCCs were investigated by means of laser-induced fluorescence (LIF) in connection with photodynamic therapy (PDT). Topical application of delta-amino levulinic acid (ALA) was performed six hours prior to the treatment session. Fluorescence spectra were recorded, using a point-monitoring system with an excitation wavelength of 405 nm. The measurements were performed in scans over the lesion and the surrounding normal skin before application of ALA, and immediately before and after the laser treatment. The selective uptake of the photosensitiser resulted in a fluorescence intensity ratio of 2.4:1 for superficial BCCs and 2.5:1 for nodular BCCs. If the fluorescence intensity was divided by the autofluorescence, this resulted in a contrast enhancement of about a factor 6 for tumour tissue. In seven patients (five with nodular BCC and two with superficial BCC), additional fluorescence measurements were performed two and four hours following the ALA application, and two hours after the PDT procedure. Thus, the kinetics of the transformation of ACA to protoporphyrin IX (PpIX) could be followed, which indicated that the synthesis of PpIX was more rapid in the tumour than in the normal tissue. After four hours, the PpIX level inside the tumour was saturated, while there still was an accumulation in the surrounding skin. The highest contrast between tumour and normal skin was reached within two hours after the ALA application. (Less)
Please use this url to cite or link to this publication:
https://lup.lub.lu.se/record/2260477
- author
- af Klinteberg, C ; Nilsson, AMK ; Wang, I ; Andersson-Engels, Stefan LU ; Svanberg, Sune LU and Svanberg, Katarina LU
- organization
- publishing date
- 1996
- type
- Chapter in Book/Report/Conference proceeding
- publication status
- published
- subject
- host publication
- Optical Biopsies and Microscopic Techniques, Proceedings of
- editor
- Bigio, IJ ; Grundfest, WS ; Schneckenburger, H ; Svanberg, Katarina ; Viallet, PM and Katzir, A
- volume
- 2926
- pages
- 32 - 40
- publisher
- SPIE
- conference name
- Conference on Optical Biopsies and Microscopic Techniques, VIENNA, AUSTRIA, SEP 07-09, 1996
- conference dates
- 0001-01-02
- external identifiers
-
- scopus:0030354479
- ISBN
- 0-8194-2328-9
- DOI
- 10.1117/12.260817
- language
- English
- LU publication?
- yes
- id
- 1a902804-8961-4ae8-825a-871a76cab61b (old id 2260477)
- date added to LUP
- 2016-04-04 12:24:38
- date last changed
- 2022-04-16 05:08:31
@inproceedings{1a902804-8961-4ae8-825a-871a76cab61b, abstract = {{Fourteen patients with superficial basal cell carcinomas (BCCs) and fifteen patients with nodular BCCs were investigated by means of laser-induced fluorescence (LIF) in connection with photodynamic therapy (PDT). Topical application of delta-amino levulinic acid (ALA) was performed six hours prior to the treatment session. Fluorescence spectra were recorded, using a point-monitoring system with an excitation wavelength of 405 nm. The measurements were performed in scans over the lesion and the surrounding normal skin before application of ALA, and immediately before and after the laser treatment. The selective uptake of the photosensitiser resulted in a fluorescence intensity ratio of 2.4:1 for superficial BCCs and 2.5:1 for nodular BCCs. If the fluorescence intensity was divided by the autofluorescence, this resulted in a contrast enhancement of about a factor 6 for tumour tissue. In seven patients (five with nodular BCC and two with superficial BCC), additional fluorescence measurements were performed two and four hours following the ALA application, and two hours after the PDT procedure. Thus, the kinetics of the transformation of ACA to protoporphyrin IX (PpIX) could be followed, which indicated that the synthesis of PpIX was more rapid in the tumour than in the normal tissue. After four hours, the PpIX level inside the tumour was saturated, while there still was an accumulation in the surrounding skin. The highest contrast between tumour and normal skin was reached within two hours after the ALA application.}}, author = {{af Klinteberg, C and Nilsson, AMK and Wang, I and Andersson-Engels, Stefan and Svanberg, Sune and Svanberg, Katarina}}, booktitle = {{Optical Biopsies and Microscopic Techniques, Proceedings of}}, editor = {{Bigio, IJ and Grundfest, WS and Schneckenburger, H and Svanberg, Katarina and Viallet, PM and Katzir, A}}, isbn = {{0-8194-2328-9}}, language = {{eng}}, pages = {{32--40}}, publisher = {{SPIE}}, title = {{Laser-induced fluorescence diagnostics of basal cell carcinomas of the skin following topical ALA application}}, url = {{https://lup.lub.lu.se/search/files/5998697/2297347.pdf}}, doi = {{10.1117/12.260817}}, volume = {{2926}}, year = {{1996}}, }