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

Dosimetry for asymmetric x-ray fields

W Kwa1, R O Kornelsen, R W Harrison

  • 1Department of Clinical Physics, British Columbia Cancer Agency, Vancouver, Canada.

Medical Physics
|October 1, 1994
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

Sample preparation for actinide isotopic analysis using FIB-SEM.

Journal of radioanalytical and nuclear chemistry·2026
Same author

Enhanced Radiation Tolerance of Tungsten Nanoparticles to He Ion Irradiation.

Nanomaterials (Basel, Switzerland)·2018
Same author

Engineering self-organising helium bubble lattices in tungsten.

Scientific reports·2017
Same author

An open-label, phase 2, single centre, randomized, crossover design bioequivalence study of AndroForte 5 testosterone cream and Testogel 1% testosterone gel in hypogonadal men: study LP101.

Andrology·2016
Same author

Stereotactic body radiotherapy: volumetric modulated arc therapy versus 3D non-coplanar conformal radiotherapy for the treatment of early stage lung cancer.

Technology in cancer research & treatment·2013
Same author

Cultivation of the Virus of St. Louis Encephalitis.

The American journal of pathology·2009
Same journal

Correction to "On the shape of the radiation survival curve in tumor spheroids: The role of oxygen heterogeneity".

Medical physics·2026
Same journal

Multi-view constrained semi-supervised vertebra detection for 3D ultrasound spine volume.

Medical physics·2026
Same journal

Accuracy of quantitative <sup>177</sup>Lu SPECT/CT imaging: A systematic review.

Medical physics·2026
Same journal

Physics-constrained dual-domain network for CBCT reconstruction from orthogonal X-rays in gynecologic radiotherapy.

Medical physics·2026
Same journal

Decomposition-based harmonization for quantitative PET imaging across scanners and radiotracers.

Medical physics·2026
Same journal

Development and evaluation of an in vivo dose-based monitoring system for electron FLASH radiation therapy.

Medical physics·2026
See all related articles

A new algorithm corrects for reduced radiation dose in asymmetric fields used in modern linear accelerators (linacs). This method simplifies dosimetry and treatment planning for physicists, improving accuracy in radiation therapy.

Area of Science:

  • Medical Physics
  • Radiation Oncology
  • Radiotherapy

Background:

  • Conventional linear accelerators use symmetric collimators, defining square or rectangular fields.
  • Modern linacs feature independent jaws, enabling asymmetric fields with clinical applications.
  • Asymmetric collimators complicate radiation dosimetry and treatment planning for medical physicists.

Purpose of the Study:

  • To develop and validate an algorithm for dose correction in asymmetric radiation fields.
  • To simplify data acquisition and treatment planning for asymmetric collimator settings.
  • To account for the reduced dose in smaller asymmetric fields compared to symmetric fields.

Main Methods:

  • An algorithm based on Day's equivalent field calculation was developed.

Related Experiment Videos

  • A correction factor was derived, dependent on field sizes, off-axis distance, and depth.
  • Beam profiles for asymmetric fields were measured for 6 and 10 MV photon beams.

    • Main Results:

    • The algorithm corrects for dose reduction in asymmetric fields.
    • The correction factor is a function of symmetric and asymmetric field dimensions and measurement depth.
    • Measured beam profiles validated the approach for clinical photon beam energies.

    Conclusions:

    • The developed algorithm effectively corrects dosimetry for asymmetric fields in linear accelerators.
    • This method simplifies clinical implementation and improves accuracy in radiation therapy planning.
    • The approach is applicable to independent jaw asymmetry in photon beams.