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

Effect of collimator setting on the output of rectangular fields from linear accelerators.

S K Jani1, E C Pennington, J E Wacha

  • 1Division of Radiation Oncology, University of Iowa Hospitals and Clinics, Iowa City 52242.

Medical Dosimetry : Official Journal of the American Association of Medical Dosimetrists
|January 1, 1988
PubMed
Summary

Rectangular fields from linear accelerators can differ in output (cGy/mu) compared to equivalent square fields. Using the lower collimator jaws for elongated fields introduces a few percent error, necessitating specific guidelines for high-energy linacs.

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

Implementation strategies to support pre-exposure prophylaxis for HIV prevention care for cisgender women in federally-funded family planning clinics in Atlanta, Georgia.

Frontiers in reproductive health·2025
Same author

Publisher Correction: Brain charts for the human lifespan.

Nature·2022
Same author

Brain charts for the human lifespan.

Nature·2022
Same author

Comment.

Statistics in biopharmaceutical research·2018
Same author

Clustering of clinical and environmental Escherichia coli O104 isolates using the DiversiLab™ repetitive sequence-based PCR system.

Current microbiology·2014
Same author

Conducting systematic reviews of intervention questions I: Writing the review protocol, formulating the question and searching the literature.

Zoonoses and public health·2014

Area of Science:

  • Medical Physics
  • Radiation Oncology
  • Radiotherapy Physics

Background:

  • Accurate dose delivery in radiation therapy is critical for effective cancer treatment.
  • Linear accelerators (linacs) are widely used for external beam radiotherapy.
  • The output of radiation fields from linacs can be influenced by various factors, including collimator settings.

Purpose of the Study:

  • To investigate and quantify the output variations between rectangular and equivalent square fields from a linear accelerator.
  • To analyze the impact of upper and lower collimator jaw settings on radiation output for different X-ray energies.
  • To provide recommendations for optimizing rectangular field setup in high-energy linac treatments.

Main Methods:

  • Measured radiation output (cGy/mu) for rectangular fields of varying dimensions using 4, 6, and 24 MV X-rays.

Related Experiment Videos

  • Compared the output of rectangular fields with their calculated equivalent square fields.
  • Evaluated the effect of using the lower collimator jaws for setting the longer dimension of rectangular fields.

    • Main Results:

    • Significant output variations were observed between rectangular and equivalent square fields.
    • Using the lower collimator jaws for the longer dimension of elongated fields introduced a few percent error in output.
    • These discrepancies were noted for specific X-ray energies (4, 6, and 24 MV).

    Conclusions:

    • The equivalent square method may not accurately represent the output for all rectangular fields, especially elongated ones.
    • Errors in radiation output can occur if specific collimator jaw configurations are not carefully considered.
    • Development of specific guidelines for setting rectangular fields on high-energy linacs is recommended to ensure dose accuracy.