title: Characterization of commercial MOSFET detectors and their feasibility for in-vivo HDR brachytherapy.
abstract: OBJECTIVE
  The present study was to investigate the use of MOSFET as an vivo dosimeter for the application of Ir-192 HDR brachytherapy treatments.
  
  
  METHODS
  MOSFET was characterized for dose linearity in the range of 50-1000 cGy, depth dose dependence from 2 to 7 cm, angular dependence. Signal fading was checked for two weeks.
  
  
  CONCLUSIONS
  Dose linearity was found to be within 2% in the dose range (50-1000 cGy). The response varied within 8.07% for detector-source distance of 2-7 cm. The response of MOSFET with the epoxy side facing the source (0 degree) is the highest and the lowest response was observed at 90 and 270 degrees. Signal was stable during the study period.
  
  
  CONCLUSIONS
  The detector showed high dose linearity and insignificant fading. But due to angular and depth dependence, care should be taken and corrections must be applied for clinical dosimetry.
authors.affiliation: Radiation Oncology Department, ACTREC, TMC, India. Electronic address: rphurailatpam@actrec.gov.in.
authors.forename: Reena
authors.initials: R
authors.lastname: Phurailatpam
authors.affiliation: Medical Physics Department, TMH, TMC, India.
authors.forename: Rituraj
authors.initials: R
authors.lastname: Upreti
authors.affiliation: Radiation Oncology Department, ACTREC, TMC, India.
authors.forename: Siji
authors.initials: S
authors.lastname: Nojin Paul
authors.affiliation: Radiation Oncology Department, ACTREC, TMC, India.
authors.forename: Swamidas V
authors.initials: SV
authors.lastname: Jamema
authors.affiliation: Medical Physics Department, TMH, TMC, India.
authors.forename: Deepak D
authors.initials: DD
authors.lastname: Deshpande
mesh_terms: D001918:Brachytherapy / Q000295:instrumentation* / Q000379:methods*; D002138:Calibration; D004307:Dose-Response Relationship, Radiation; D004867:Equipment Design; D005240:Feasibility Studies; D006801:Humans; D007496:Iridium Radioisotopes / Q000737:chemistry*; D019047:Phantoms, Imaging; D011874:Radiometry / Q000379:methods*; D011879:Radiotherapy Dosage; D015203:Reproducibility of Results; D013696:Temperature
chemical_list: D007496:Iridium Radioisotopes
keywords: Angular dependence; Depth dependence; Dose linearity; HDR brachytherapy; In vivo dosimetry; MOSFET