Results 241 to 250 of about 2,714,943 (294)
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Two-Photon Photodynamic Therapy
Journal of Clinical Laser Medicine & Surgery, 1997We demonstrate the use of infrared excitation in conjunction with an efficient two-photon absorbing dye and a photosensitizer in photodynamic therapy.An efficient two-photon absorbing dye is excited by short infrared (800 nm) laser pulses, which transfer its energy to the photosensitizer and the photosensitizer, in turn, generates the singlet oxygen.A ...
J D, Bhawalkar +3 more
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Biological Considerations When Comparing Proton Therapy With Photon Therapy
Seminars in Radiation Oncology, 2013Owing to the limited availability of data on the outcome of proton therapy, treatments are generally optimized based on broadly available data on photon-based treatments. However, the microscopic pattern of energy deposition of protons differs from that of photons, leading to a different biological effect.
Paganetti, Harald, van Luijk, Peter
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Motion in radiotherapy: photon therapy
Physics in Medicine and Biology, 2012This review considers the management of motion in photon radiation therapy. An overview is given of magnitudes and variability of motion of various structures and organs, and how the motion affects images by producing artifacts and blurring. Imaging of motion is described, including 4DCT and 4DPET.
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On bolus for megavoltage photon and electron radiation therapy
Medical Dosimetry, 2013Frequently, in radiation therapy one must treat superficial lesions on cancer patients; these are at or adjacent to the skin. Megavoltage photon radiotherapy penetrates through the skin to irradiate deep-seated tumors, with skin-sparing property. Hence, to treat superficial lesions, one must use a layer of scattering material to feign as the skin ...
Vedang, Vyas +7 more
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Optimization of photon beam flatness for radiation therapy
Physics in Medicine and Biology, 2007In this work, we investigate the relation between lateral fluence/dose distributions and photon beam uniformity, possibly identifying ways to improve these characteristics. The calculations included treatment head scatter properties associated with three common types of linear accelerators in order to study their impact on the results.
Jörgen, Olofsson +3 more
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Regenerative photonic therapy: Review
AIP Conference Proceedings, 2012After four decades of research of photobiomodulation phenomena in mammals in vitro and in vivo, a solid foundation is created for the use of photobiomodulation in regenerative medicine. Significant accomplishments are achieved in animal models that demonstrate opportunities for photo-regeneration of injured or pathological tissues: skin, muscles and ...
Natasha Salansky, Norman Salansky
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Exit dose studies in megavoltage photon therapy
The British Journal of Radiology, 1983A coin-shaped ionisation chamber, orientated with its thin window facing away from the radiation source, was used to investigate the dose perturbations caused by the absence of back-scattering material near the exit surface of solid phantoms. Cobalt 60 and 4, 8 and 16 MV X-ray beams were used in the study. With no scattering material beyond the chamber
G D, Lambert +3 more
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Collimator scatter in photon therapy beams
Medical Physics, 1995A model for collimator photon scatter calculations is presented. The scatter from a collimating block is separated into two categories, one being the scatter released from photons entering the block through the surface facing the source, and one from photons striking the block tangentially through the side tangential to the beam.
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Photon and photon–neutron experimental dosimetry in Grid therapy with 18 MV photon beams
Journal of Radiotherapy in Practice, 2020AbstractPropose:Spatially fractionated Grid radiation therapy (SFGRT) in an effective technique for bulky and radio-sensitive tumours. SFGRT using a constructed block has been used to evaluate the photon and photo-neutron (PN) dose measurement in 18-MV photon beam energy.Methods and materials:A mounted Grid block on to a Varian Clinac 2100c linear ...
Sareh Tajiki +6 more
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Two-photon excitation nanoparticles for photodynamic therapy
Chemical Society Reviews, 2016Integration of the two-photon excitation (TPE) technique and nanomaterials to construct TPE nanoparticle-based photosensitizers for PDT is summarized and reviewed.
Yizhong, Shen +4 more
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