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Zeng K, Abugarib A, Soliman H, Myrehaug S, Husain Z, Detsky J, Ruschin M, Karotki A, Atenafu E, Maralani P, Sahgal A, Tseng C. Dose-Escalated Two-Fraction Spine Stereotactic Body Radiotherapy: 28 Gy vs. 24 Gy in 2 Daily Fractions. Int J Radiat Oncol Biol Phys 2022. [DOI: 10.1016/j.ijrobp.2022.07.663] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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Mashouf S, Lechtman E, Lai P, Keller BM, Karotki A, Beachey DJ, Pignol JP. Dose heterogeneity correction for low-energy brachytherapy sources using dual-energy CT images. Phys Med Biol 2014; 59:5305-16. [PMID: 25146446 DOI: 10.1088/0031-9155/59/18/5305] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Abstract
Permanent seed implant brachytherapy is currently used for adjuvant radiotherapy of early stage prostate and breast cancer patients. The current standard for calculation of dose around brachytherapy sources is based on the AAPM TG-43 formalism, which generates the dose in a homogeneous water medium. Recently, AAPM TG-186 emphasized the importance of accounting for tissue heterogeneities. We have previously reported on a methodology where the absorbed dose in tissue can be obtained by multiplying the dose, calculated by the TG-43 formalism, by an inhomogeneity correction factor (ICF). In this work we make use of dual energy CT (DECT) images to extract ICF parameters. The advantage of DECT over conventional CT is that it eliminates the need for tissue segmentation as well as assignment of population based atomic compositions. DECT images of a heterogeneous phantom were acquired and the dose was calculated using both TG-43 and TG-43 [Formula: see text] formalisms. The results were compared to experimental measurements using Gafchromic films in the mid-plane of the phantom. For a seed implant configuration of 8 seeds spaced 1.5 cm apart in a cubic structure, the gamma passing score for 2%/2 mm criteria improved from 40.8% to 90.5% when ICF was applied to TG-43 dose distributions.
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Affiliation(s)
- S Mashouf
- Medical Biophysics Department, University of Toronto, 2075 Bayview Avenue, Toronto, ON M4N3M5, Canada
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Drobizhev M, Karotki A, Kruk M, Dzenis Y, Rebane A, Suo Z, Spangler CW. Uncovering Coherent Domain Structure in a Series of π-Conjugated Dendrimers by Simultaneous Three-Photon Absorption. J Phys Chem B 2004. [DOI: 10.1021/jp037437o] [Citation(s) in RCA: 34] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- M. Drobizhev
- Department of Physics, Montana State University, Bozeman, Montana 59717, Lebedev Physics Institute, Leninsky pr., 53, 119991 Moscow, Russia, Institute of Molecular and Atomic Physics, National Academy of Sciences of Belarus, 70 F. Skarina Avenue, 220072 Minsk, Belarus, and Department of Chemistry and Biochemistry, Montana State University, Bozeman, Montana 59717
| | - A. Karotki
- Department of Physics, Montana State University, Bozeman, Montana 59717, Lebedev Physics Institute, Leninsky pr., 53, 119991 Moscow, Russia, Institute of Molecular and Atomic Physics, National Academy of Sciences of Belarus, 70 F. Skarina Avenue, 220072 Minsk, Belarus, and Department of Chemistry and Biochemistry, Montana State University, Bozeman, Montana 59717
| | - M. Kruk
- Department of Physics, Montana State University, Bozeman, Montana 59717, Lebedev Physics Institute, Leninsky pr., 53, 119991 Moscow, Russia, Institute of Molecular and Atomic Physics, National Academy of Sciences of Belarus, 70 F. Skarina Avenue, 220072 Minsk, Belarus, and Department of Chemistry and Biochemistry, Montana State University, Bozeman, Montana 59717
| | - Yu. Dzenis
- Department of Physics, Montana State University, Bozeman, Montana 59717, Lebedev Physics Institute, Leninsky pr., 53, 119991 Moscow, Russia, Institute of Molecular and Atomic Physics, National Academy of Sciences of Belarus, 70 F. Skarina Avenue, 220072 Minsk, Belarus, and Department of Chemistry and Biochemistry, Montana State University, Bozeman, Montana 59717
| | - A. Rebane
- Department of Physics, Montana State University, Bozeman, Montana 59717, Lebedev Physics Institute, Leninsky pr., 53, 119991 Moscow, Russia, Institute of Molecular and Atomic Physics, National Academy of Sciences of Belarus, 70 F. Skarina Avenue, 220072 Minsk, Belarus, and Department of Chemistry and Biochemistry, Montana State University, Bozeman, Montana 59717
| | - Z. Suo
- Department of Physics, Montana State University, Bozeman, Montana 59717, Lebedev Physics Institute, Leninsky pr., 53, 119991 Moscow, Russia, Institute of Molecular and Atomic Physics, National Academy of Sciences of Belarus, 70 F. Skarina Avenue, 220072 Minsk, Belarus, and Department of Chemistry and Biochemistry, Montana State University, Bozeman, Montana 59717
| | - C. W. Spangler
- Department of Physics, Montana State University, Bozeman, Montana 59717, Lebedev Physics Institute, Leninsky pr., 53, 119991 Moscow, Russia, Institute of Molecular and Atomic Physics, National Academy of Sciences of Belarus, 70 F. Skarina Avenue, 220072 Minsk, Belarus, and Department of Chemistry and Biochemistry, Montana State University, Bozeman, Montana 59717
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Drobizhev M, Karotki A, Rebane A, Spangler CW. Dendrimer molecules with record large two-photon absorption cross section. Opt Lett 2001; 26:1081-1083. [PMID: 18049526 DOI: 10.1364/ol.26.001081] [Citation(s) in RCA: 136] [Impact Index Per Article: 5.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/25/2023]
Abstract
We report what is to our knowledge a record high value for an intrinsic two-photon absorption (TPA) cross section, sigma(2) = 11 x 10(-47)> cm>(4)> s photon(-1) molecule(-1), measured with femtosecond pulses in a new dendrimer molecule comprising 29 repeat units of 4, 4(?)-bis(diphenylamino)stilbene chromophore. We measure the dependence of TPA on excitation wavelength in three consecutive generations of the dendrimer and show that the maximum sigma(2) value increases faster than the total number of stilbene chromophores. This result indicates that it is possible to obtain even larger sigma(2) values in higher generations of this dendrimer family.
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