BACKGROUND AND OBJECTIVE: On-line monitoring of light fluence during intraperitoneal photodynamic therapy (IP PDT) is crucial for safe light delivery. A flat photodiode-based dosimetry system is compared with an isotropic detector-based system in patients undergoing IP PDT. STUDY DESIGN/ MATERIALS AND METHODS: Flat photodiodes and spherical detectors were placed side by side in the abdomen, for simultaneous light dosimetry in 19 patients. Tissue phantom experiments were performed to provide a preliminary estimate of the tissue optical properties of the peritoneum. RESULTS: The conversion factor between systems for 630-nm light was found to be 1.7 +/- 0.12. The mu(eff) of the tissues in the abdomen is estimated to vary between 0.5 cm(-1) to 1.4 cm(-1) assuming a mu(s)' = 7 cm(-1). CONCLUSIONS: The measured conversion factor should allow for comparison of light fluences with future clinical protocols that use an isotropic-based detector system. Differences in the optical properties of the underlying tissues may contribute to the variability in light measurements. Copyright 2000 Wiley-Liss, Inc.
BACKGROUND AND OBJECTIVE: On-line monitoring of light fluence during intraperitoneal photodynamic therapy (IP PDT) is crucial for safe light delivery. A flat photodiode-based dosimetry system is compared with an isotropic detector-based system in patients undergoing IP PDT. STUDY DESIGN/ MATERIALS AND METHODS: Flat photodiodes and spherical detectors were placed side by side in the abdomen, for simultaneous light dosimetry in 19 patients. Tissue phantom experiments were performed to provide a preliminary estimate of the tissue optical properties of the peritoneum. RESULTS: The conversion factor between systems for 630-nm light was found to be 1.7 +/- 0.12. The mu(eff) of the tissues in the abdomen is estimated to vary between 0.5 cm(-1) to 1.4 cm(-1) assuming a mu(s)' = 7 cm(-1). CONCLUSIONS: The measured conversion factor should allow for comparison of light fluences with future clinical protocols that use an isotropic-based detector system. Differences in the optical properties of the underlying tissues may contribute to the variability in light measurements. Copyright 2000 Wiley-Liss, Inc.
Authors: Harry Quon; Craig E Grossman; Jarod C Finlay; Timothy C Zhu; Clarice S Clemmens; Kelly M Malloy; Theresa M Busch Journal: Photodiagnosis Photodyn Ther Date: 2011-06 Impact factor: 3.631
Authors: Timothy C Zhu; Joseph S Friedberg; Andrea Dimofte; Jeremy Miles; James Metz; Eli Glatstein; Stephen M Hahn Journal: Proc SPIE Int Soc Opt Eng Date: 2002-06-06
Authors: Stephanie R Rice; Yun R Li; Theresa M Busch; Michele M Kim; Sally McNulty; Andrea Dimofte; Timothy C Zhu; Keith A Cengel; Charles B Simone Journal: Photochem Photobiol Date: 2018-12-28 Impact factor: 3.421