Search research articles

ABOUT JoVE

Overview Leadership Blog JoVE Help Center

AUTHORS

Publishing Process Editorial Board Scope & Policies Peer Review FAQ Submit

LIBRARIANS

Testimonials Subscriptions Access Resources Library Advisory Board FAQ

RESEARCH

JoVE Journal Methods Collections JoVE Encyclopedia of Experiments Archive

EDUCATION

JoVE Core JoVE Business JoVE Science Education JoVE Lab Manual Faculty Resource Center Faculty Site

Terms & Conditions of Use

Search research articles

Related Experiment Videos

High-resolution field shaping utilizing a masked multileaf collimator.

P C Williams¹, P Cooper

¹North Western Medical Physics, Christie Hospital NHS Trust, Manchester, UK.

Physics in Medicine and Biology

|August 25, 2000

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

An Unusual Case of Post-Partum Hemorrhage: Reported at Baltimore Gynæcological Society.

The Southern medical record·2022

Same author

Hypodermic Ergot in Post-Partum Hemorrhage.

Atlanta medical and surgical journal·2022

Same author

Prediction of pork quality with near infrared spectroscopy (NIRS) 2. Feasibility and robustness of NIRS measurements under production plant conditions.

Meat science·2012

Same author

Instability of dienoestrol and stilboestrol solutions.

Nature·2010

Same author

Fertilization of eggs in hypophysectomized rats.

The Journal of endocrinology·2010

Same author

Consensus statement: the development of a national Canadian Migraine Strategy.

The Canadian journal of neurological sciences. Le journal canadien des sciences neurologiques·2010

Same journal

Effective contrast-enhanced preprocessing for intracranial artery segmentation in digital subtraction angiography.

Physics in medicine and biology·2026

Same journal

Improving Plan Quality in Adaptive Proton Therapy Using an Interactive Dose Modification Tool.

Physics in medicine and biology·2026

Same journal

Technical Note: Real-Time MLC Control and Latency Measurement Optimization with External Verification.

Physics in medicine and biology·2026

Same journal

Fetus-Specific Hematopoietic Stem Cell Dosimetry Framework for Leukemia-Relevant Target Cells During Prenatal Development.

Physics in medicine and biology·2026

Same journal

Deep learning-based dose prediction to enhance planning efficiency in cervical brachytherapy with hybrid applicators.

Physics in medicine and biology·2026

Same journal

Corrigendum: Referenceless MR thermometry-a comparison of five methods (2017<i>Phys. Med. Biol</i>.<b>62</b>1-16).

Physics in medicine and biology·2026

See all related articles

A new tertiary grid collimator improves radiotherapy beam shaping by enhancing resolution beyond conventional multileaf collimators (MLCs). This method reduces field edge scalloping and penumbra, offering greater precision in radiation delivery.

Area of Science:

Medical Physics
Radiation Oncology
Radiotherapy Technology

Background:

Conventional multileaf collimators (MLCs) in radiotherapy have a resolution limit of 1 cm, which can be insufficient for precise shielding.
Existing mini- and micro-MLCs are limited to specific applications and field sizes.
There is a need for higher resolution beam collimation in radiotherapy.

Purpose of the Study:

To propose and evaluate a novel high-resolution beam collimation method using a tertiary grid collimator placed below the conventional MLC.
To assess the beam uniformity and field shaping capabilities of this new system.

Main Methods:

A prototype tertiary grid collimator with sub-millimeter slit widths was tested.
Beam transmission profiles were measured using a diode and film.

Related Experiment Videos

Composite beams were generated by superposing subfield profiles.

Field shaping and penumbra were analyzed by generating sine wave patterns.

Main Results:

Composite beams using 2 x 5.0 mm grids showed hot spots up to 5.0% and troughs of 3%.
Composite beams using 4 x 2.5 mm grids achieved a maximum of 3.0% above and 2.5% below the average dose.
The tertiary grid collimator significantly reduced the scalloping effect at field edges compared to conventional MLCs.
Minimal beam penumbra broadening was observed.

Conclusions:

The proposed tertiary grid collimator offers a viable method for high-resolution beam shaping in radiotherapy.
This technology enhances precision by improving field conformity and reducing edge artifacts.
Further development could expand the applications of this advanced collimation system.