نتایج جستجو برای: entrance dose
تعداد نتایج: 319618 فیلتر نتایج به سال:
Entrance skin dose (ESD) is an important parameter for assessing the dose received by a patient in a single radiographic exposure. The most useful way to evaluate ESD is either by direct measurement on phantoms using an ionization chamber or using calculations based on a mathematical model. We compared six phantoms (three anthropomorphic, two physical, and one mathematical) in 11 standard clini...
The feasibility of using dual bias metal oxide semiconductor field effect transistors (MOSFET) detectors with the new hemispherical brass build up cap for in vivo dose measurements in Prostate IMRT treatments was investigated and achieved. A general formalism with various correction factors taken into account to predict Dmax entrance skin dose for the IMRT fields with MOSFETS was developed and ...
Introduction: One of the useful standard quality assurance techniques in radiation therapy is monitoring entrance doses in in-vivo dosimetry. An overall tolerance limit of 5% of the absorbed radiation dose has been recommended by the International Commission of Radiological Units. The implementation of an in vivo dosimet...
Introduction: Chemotherapy has been restricted due to the high-dose side effects. In the present study, acceleration of the chemotherapeutic drug (5FU) entrance into MCF-7 cells has been explored by using a recombinant form of Fragaceatoxin C (FraC) pore-forming toxin. Methods: In this experimental study, the gene for FraC toxin was order from a commercial source and was sub-cloned into pET28a...
Contralateral breast dose from primary breast irradiation has been implicated in the risk of second breast malignancies. In the radiotherapy departments of Iran, based on oncologist’s and physicist’s viewpoint, a special technique and set-up may be used for treatment of chest wall in mastectomized patient. The present study compared three different breast treatment techniques and set-up use...
Introduction: During radiotherapy, high accuracy in the dose delivery is required because there is a strong relationship between the absorbed dose, local tumor control and particularly the normal tissue damage. In many institutions, in vivo dosimetry using diodes is performed to check the actual dose delivered. In general, the uncertainty in the dose delivered should fall within ± 5% of the...
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