Beam related response of in vivo diode detectors for external radiotherapy

Journal Article · Fri Mar 25 04:00:00 EDT 2016 · AIP Conference Proceedings

DOI:https://doi.org/10.1063/1.4944210· OSTI ID:22590995

Baci, Syrja ^[1]; Telhaj, Ervis ^[2]; Malkaj, Partizan ^[3]

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1. Department of Physics, Faculty of Natural Sciences, University of Gjirokastra, “Eqrem Çabej” (Albania)
2. Department of Medical Physics, Hygeia Hospital Tirana (Albania)
3. Department of Physical Engineering, Polytechnic University, Tirana (Albania)

In Vivo Dosimetry (IVD) is a set of methods used in cancer treatment clinics to determine the real dose of radiation absorbed by target volume in a patient’s body. IVD has been widely implemented in radiotherapy treatment centers and is now recommended part of Quality Assurance program by many International health and radiation organizations. Because of cost and lack of specialized personnel, IVD has not been practiced as yet, in Albanian radiotherapy clinics. At Hygeia Hospital Tirana, patients are irradiated with high energy photons generated by Elekta Synergy Accelerators. We have recently started experimenting with the purpose of establishing an IVD practice at this hospital. The first set of experiments was aimed at calibration of diodes that are going to be used for IVD. PMMA, phantoms by PTW were used to calibrate p – type Si, semiconductor diode dosimeters, made by PTW Freiburg for entrance dose. Response of the detectors is affected by energy of the beam, accumulated radiation dose, dose rate, temperature, angle against the beam axis, etc. Here we present the work done for calculating calibration factor and correction factors of source to surface distance, field size, and beam incidence for the entrance dose for both 6 MV photon beam and 18 MV photon beam. Dependence of dosimeter response was found to be more pronounced with source to surface distance as compared to other variables investigated.

• OSTI ID: 22590995
• Journal Information: AIP Conference Proceedings, Journal Name: AIP Conference Proceedings Journal Issue: 1 Vol. 1722; ISSN APCPCS; ISSN 0094-243X
• Country of Publication: United States
• Language: English

Related Subjects

46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY
62 RADIOLOGY AND NUCLEAR MEDICINE
71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
CALIBRATION
COMPARATIVE EVALUATIONS
CORRECTIONS
DOSE RATES
DOSEMETERS
GAMMA DOSIMETRY
HOSPITALS
IN VIVO
IRRADIATION
NEOPLASMS
PATIENTS
PHANTOMS
PHOTON BEAMS
PHOTONS
PMMA
QUALITY ASSURANCE
RADIATION DOSES
RADIOTHERAPY
SI SEMICONDUCTOR DETECTORS