Correction factor measurements for multiple detectors used in small field dosimetry on the Varian Edge radiosurgery system

Medical Physics
Sean TannyE Ishmael Parsai

Abstract

Accurate dosimetry of small fields remains a challenge to the clinical physicist. Choosing the appropriate detector and determination of kQclin,Qmsr (fclin,fmsr) factors continue to be an area of active research. The purpose of this study is to evaluate the output factors for a dedicated stereotactic accelerator using multiple dosimeters designed for use in small fields and evaluate published kQclin,Qmsr (fclin,fmsr) factors relative to measured values using a commercial scintillating fiber. Four microionization chambers, a commercial plastic scintillation detector, and a semiconducting diode were used to measure output factors for a linear accelerator. Field sizes ranging from 6 × 6 to 0.6 × 0.6 cm(2) were measured in a water phantom at 10 cm depth for 100 cm SSD. All microionization chambers were mounted in both vertical and horizontal configurations. Fields were normalized to the output at 5 × 5 cm(2). Output correction factors, kQclin,Qmsr (fclin,fmsr), were calculated as the ratio of a detector response relative to the scintillating fiber response for a given clinical field size, fclin. Ionization chambers consistently under-responded for small fields relative to the scintillating fiber. Variations in response between hori...Continue Reading

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Citations

Aug 9, 2016·Physica Medica : PM : an International Journal Devoted to the Applications of Physics to Medicine and Biology : Official Journal of the Italian Association of Biomedical Physics (AIFB)·Paul Z Y LiuNatalka Suchowerska
Mar 27, 2018·Medical Physics·Neda Gholizadeh SendaniParham Alaei
Dec 10, 2019·Journal of Applied Clinical Medical Physics·Yuichi AkinoToshijiro Yamamoto
May 10, 2017·Physics in Medicine and Biology·A Kulmala, M Tenhunen
Mar 27, 2020·Journal of Radiation Research·Yuichi AkinoKazuhiko Ogawa
Jan 14, 2021·Physics in Medicine and Biology·Hugo Bouchard
Apr 5, 2021·Applied Radiation and Isotopes : Including Data, Instrumentation and Methods for Use in Agriculture, Industry and Medicine·Mario A Hernández-BecerrilJ A Hernández-Servín
May 4, 2021·Applied Radiation and Isotopes : Including Data, Instrumentation and Methods for Use in Agriculture, Industry and Medicine·Taha HachemiSaad Khoudri
May 1, 2021·Biomedical Physics & Engineering Express·Shekhar DwivediJooli Shukla
May 11, 2021·Physics in Medicine and Biology·Mathieu GonodThierry Grosjean
Jul 20, 2021·Physica Medica : PM : an International Journal Devoted to the Applications of Physics to Medicine and Biology : Official Journal of the Italian Association of Biomedical Physics (AIFB)·Sumalee YabsantiaJan Seuntjens

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