Characterization of an in vivo diode dosimetry system for clinical use
نویسندگان
چکیده
An in vivo dosimetry system that uses p-type semiconductor diodes with buildup caps was characterized for clinical use on accelerators ranging in energy from 4 to 18 MV. The dose per pulse dependence was investigated. This was done by altering the source-surface distance, field size, and wedge for photons. The off-axis correction and effect of changing repetition rate were also investigated. A model was developed to fit the measured two-dimensional diode correction factors.
منابع مشابه
In Vivo Dosimetry Using a Flat Surface Sun Nuclear Corporation Diode in 60co Beams for Some Radiotherapy Treatments in Ghana
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...
متن کاملAchievable accuracy in brain tumors by in vivo dosimetry with diode detectors
ABSTRACT Background: In vivo measurements of applied dose during radiotherapy treatment, is important to ensure accurate dose delivery to patients. Uncertainty in dose delivery should fall within ±5% of the prescribed dose as recommended by ICRU. Assessment of dose for radiotherapy applications performed with various types of detectors. In this study, semiconductor diodes were used which have s...
متن کاملVerification of the Accuracy of the Delivered Dose in Brain Tumors by in Vivo Dosimetry Using Diode Detectors
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...
متن کاملدزیمتری in-vivo در پرتودرمانی خارجی تومورهای مغزی تحت درمان با فوتون MV15 با استفاده از فیلم گاف کرومیک EBT3
Background and purpose: In-vivo dosimetry is used to ensure accurate delivery of dose to tumors during radiotherapy. This study aimed at measuring the entrance doses without the build-up cap for patients undergoing 15MV radiotherapy and determining the percentage errors between doses measured by films and those calculated with a treatment planning system (TPS). Materials and methods: The stu...
متن کاملExperimental evaluation of midline dose calculation methods in In vivo dosimetry using anatomic thorax phantom
Background: In vivo dosimetry is a method for estimation of overall error in the delivered dose to the patients at the end of radiotherapy process. In this research, two methods for target dose calculation were evaluated on midline and central axis of photon beams in in vivo dosimetry of thorax fields. Materials and Methods: Entrance and exit doses for anterior and lateral fields of thorax were...
متن کامل