Jove
Visualize
Contact Us
JoVE
x logofacebook logolinkedin logoyoutube logo
ABOUT JoVE
OverviewLeadershipBlogJoVE Help Center
AUTHORS
Publishing ProcessEditorial BoardScope & PoliciesPeer ReviewFAQSubmit
LIBRARIANS
TestimonialsSubscriptionsAccessResourcesLibrary Advisory BoardFAQ
RESEARCH
JoVE JournalMethods CollectionsJoVE Encyclopedia of ExperimentsArchive
EDUCATION
JoVE CoreJoVE BusinessJoVE Science EducationJoVE Lab ManualFaculty Resource CenterFaculty Site
Terms & Conditions of Use
Privacy Policy
Policies

Related Experiment Videos

TG-51: experience from 150 institutions, common errors, and helpful hints.

R C Tailor1, W F Hanson, G S Ibbott

  • 1Department of Radiation Physics, University of Texas M.D. Anderson Cancer Center, 1515 Holcombe Blvd., Box 547, Houston, Texas 77030, USA.

Journal of Applied Clinical Medical Physics
|June 5, 2003
PubMed
Summary
This summary is machine-generated.

Related Concept Videos

You might also read

Related Articles

Articles linked to this work by shared authors, journal, and citation graph.

Sort by
Same author

The need for, and implementation of, image guidance in radiation therapy.

Annals of the ICRP·2018
Same author

Reference dosimetry in magnetic fields: formalism and ionization chamber correction factors.

Medical physics·2016
Same author

TRIP12 as a mediator of human papillomavirus/p16-related radiation enhancement effects.

Oncogene·2016
Same author

Independent dose per monitor unit review of eight U.S.A. proton treatment facilities.

Medical physics·2014
Same author

Hormone suppression with GnRH antagonist promotes spermatogenic recovery from transplanted spermatogonial stem cells in irradiated cynomolgus monkeys.

Andrology·2013
Same author

Three-Dimensional Dosimetry of a Beta-Emitting Radionuclide Using PRESAGE Dosimeters.

Journal of physics. Conference series·2011

Medical physicists experienced significant discrepancies when switching from the TG-21 to the TG-51 dosimetry calibration protocol. Approximately half of reported beam output changes fell outside expected values, highlighting potential issues with specific chambers and phantom materials.

Area of Science:

  • Medical Physics
  • Radiological Physics
  • Dosimetry

Background:

  • The American Association of Physicists in Medicine (AAPM) Task Group 51 (TG-51) protocol is a standard for radiation dosimetry.
  • The transition from the TG-21 to the TG-51 protocol presented challenges for medical physicists in accurately calibrating radiation beams.

Purpose of the Study:

  • To assess the impact of the TG-51 protocol implementation on measured beam output.
  • To identify common difficulties and discrepancies encountered by medical physicists during the TG-21 to TG-51 conversion.

Main Methods:

  • The Radiological Physics Center (RPC) collected data on beam output changes from institutions converting from TG-21 to TG-51.
  • RPC analyzed reported calibration changes and compared them to expected values derived from a protocol comparison.

Related Experiment Videos

  • Factors contributing to deviations were identified through data analysis.

    • Main Results:

    • Approximately 50% of reported calibration changes for photon and electron beams deviated from RPC's expected values.
    • Discrepancies between reported and expected dose changes reached up to 8%.
    • Significant contributing factors included the use of plane-parallel chambers, mixed phantom materials, and inconsistent depth-dose factor application.

    Conclusions:

    • The TG-51 protocol implementation revealed significant variations in beam calibration practices.
    • Specific challenges were identified in electron calibration at low energies and with cylindrical chambers at 6 MeV.
    • Guidance is provided on factors influencing photon and electron beam calibrations under TG-51.