On the Development of a Light Dosimetry Planning Tool for Photodynamic Therapy in Arbitrary Shaped Cavities: Initial Results
| Autor: | Nienke P.M. Wassenaar, Ferdinand van der Heijden, M. Baris Karakullukcu, Willem H. Schreuder, Maarten J.A. van Alphen, Rens Bouwmans, Robert L. P. van Veen, I. Bing Tan, Thérèse E.M. van Doeveren |
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| Přispěvatelé: | Robotics and Mechatronics, RS: GROW - R2 - Basic and Translational Cancer Biology, KNO, MUMC+: MA Keel Neus Oorheelkunde (9), Oral and Maxillofacial Surgery, Other Research |
| Jazyk: | angličtina |
| Rok vydání: | 2020 |
| Předmět: |
Cone beam computed tomography
Materials science Photon reflectance Light Swine medicine.medical_treatment 030303 biophysics Nose Neoplasms UT-Hybrid-D Photodynamic therapy FLUENCE RATE Biochemistry Fluence in-vivo Imaging phantom 03 medical and health sciences DELIVERY 0302 clinical medicine Optics dysplasia NECK-CANCER medicine Light Dosimetry Animals Humans Physical and Theoretical Chemistry 0303 health sciences Linear function (calculus) Photosensitizing Agents business.industry 22/2 OA procedure General Medicine OPTICAL-PROPERTIES BLADDER head Cone-Beam Computed Tomography Disease Models Animal pdt Photochemotherapy 030220 oncology & carcinogenesis Diffuse reflection business |
| Zdroj: | Photochemistry and Photobiology, 96(2), 405-416. Wiley-Blackwell Photochemistry and photobiology, 96(2), 405-416. Wiley-Blackwell |
| ISSN: | 0031-8655 |
| Popis: | Previous dosimetric studies during photodynamic therapy (PDT) of superficial lesions within a cavity such as the nasopharynx, demonstrated significant intra- and interpatient variations in fluence rate build-up as a result of tissue surface re-emitted and reflected photons, which depends on the optical properties. This scattering effect affects the response to PDT. Recently, a meta-tetra(hydroxyphenyl)chlorin-mediated PDT study of malignancies in the paranasal sinuses after salvage surgery was initiated. These geometries are complex in shape, with spatially varying optical properties. Therefore, preplanning and in vivo dosimetry is required to ensure an effective fluence delivered to the tumor. For this purpose, two 3D light distribution models were developed: first, a simple empirical model that directly calculates the fluence rate at the cavity surface using a simple linear function that includes the scatter contribution as function of the light source to surface distance. And second, an analytical model based on Lambert's cosine law assuming a global diffuse reflectance constant. The models were evaluated by means of three 3D printed optical phantoms and one porcine tissue phantom. Predictive fluence rate distributions of both models are within +/- 20% accurate and have the potential to determine the optimal source location and light source output power settings. |
| Databáze: | OpenAIRE |
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