نتایج جستجو برای: medical internal radiation dosimetry
تعداد نتایج: 1034690 فیلتر نتایج به سال:
background: accurate voxel phantom is needed for dosimetric simulation in radiation therapy for malignant tumors in female pelvic region. however, most of the existing voxel phantoms are constructed on the basis of caucasian or non-chinese population. materials and methods: a computational framework for constructing female pelvic voxel phantom for radiation dosimetry was performed based on chin...
Application of radioactive isotopes is the treatment of choice around the globe for many cancer sites. In this technique, the accuracy of the radiation delivery is highly dependent on the accuracy of radiation dosimetry around individual brachytherapy sources. Moreover, in order to have compatible clinical results, an identical method of source dosimetry must be employed across the world. This ...
abstract background: adjacent treatment fields are commonly used in external beam radiation therapy, such as mantle and inverted-y fields for the treatment of hodgkin’s disease and craniospinal fields used in the treatment of medulloblastoma and head and neck tumors when the lateral neck fields are placed adjacent to the anterior supraclavicular field. in each of these situations, there is a po...
background: in conventional radiation therapy, regarding normal tissue tolerance, the treatment of bulk tumors is one of the remaining challenges. grid radiation therapy (grt) is a technique to deliver high doses, approximately 15 – 20 gy per fraction, to several small volumes located in a large radiation field. this can be performed using a grid block. the current work has concentrated on the ...
Incomplete radiation exposure histories, inadequate treatment of internally deposited radionuclides, and failure to account for neutron exposures can be important uncertainties in epidemiologic studies of radiation workers. Organ-specific doses from lifetime occupational exposures and radionuclide intakes were estimated for an epidemiologic study of 5,801 Rocketdyne/Atomics International (AI) r...
Radiotherapy (RT) has played important roles in cancer treatment for more than one century. The development of RT techniques allows high-dose irradiation to tumors while reducing the radiation doses delivered to surrounding normal tissues. However, RT is a complex process and involves understanding of the principles of medical physics, radiobiology, radiation safety, dosimetry, radiation treatm...
BACKGROUND Radiotherapy for breast cancer may expose the esophagus to ionizing radiation, but no study has evaluated esophageal cancer risk after breast cancer associated with radiation dose or systemic therapy use. DESIGN Nested case-control study of esophageal cancer among 289 748 ≥5-year survivors of female breast cancer from five population-based cancer registries (252 cases, 488 individu...
90 Y is traditionally considered as a pure β – emitter. However, the decay of this radionuclide has a minor branch to the 0 + first excited state of 90 Zr at 1.76 MeV, that is followed by a β + /β – emission. This internal pair production has been largely studied in the past because it is generated by a rare electric monopole transition (E0) between the states 0 + /0 + of 90 Zr. The positronic ...
BACKGROUND Coincidence imaging of low-abundance yttrium-90 (90Y) internal pair production by positron emission tomography with integrated computed tomography (PET/CT) achieves high-resolution imaging of post-radioembolization microsphere biodistribution. Part 2 analyzes tumor and non-target tissue dose-response by 90Y PET quantification and evaluates the accuracy of tumor 99mTc macroaggregated ...
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