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Related Experiment Video

Updated: Jun 26, 2026

Simulating Imaging of Large Scale Radio Arrays on the Lunar Surface

Simulating Imaging of Large Scale Radio Arrays on the Lunar Surface

Published on: July 30, 2020

A robust Hough transform algorithm for determining the radiation centers of circular and rectangular fields with

Weiliang Du¹, James Yang

¹Department of Radiation Physics, University of Texas M D Anderson Cancer Center, 1515 Holcombe Blvd, Unit 94, Houston, TX 77030, USA. wdu@mdanderson.org

Physics in Medicine and Biology

|January 7, 2009

Summary

A new Hough transform (HT) algorithm accurately localizes radiation field centers with subpixel precision. This method improves accuracy and robustness compared to traditional techniques for radiation therapy applications.

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High-throughput Image Analysis of Tumor Spheroids: A User-friendly Software Application to Measure the Size of Spheroids Automatically and Accurately

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Area of Science:

Medical Physics
Radiotherapy
Image Analysis

Background:

Accurate localization of radiation field centers is crucial for minimizing positional errors in radiation therapy.
Existing methods for center localization may be susceptible to noise and artifacts, impacting precision.

Purpose of the Study:

To develop a Hough transform (HT)-based algorithm for precise localization of radiation field centers.
To achieve subpixel accuracy in identifying the radiation center of circular and rectangular fields.

Main Methods:

Development of a computer algorithm utilizing the Hough transform (HT).
Testing the algorithm on circular fields to determine localization accuracy.
Comparison of the HT method with the traditional center-of-mass method.

Main Results:

The HT method achieved subpixel accuracy, with a mean detection error of 0.037 +/- 0.019 pixels for circular fields.
This translates to a mean error of 0.02 mm on a 0.5 mm resolution electronic portal imager.
The HT method demonstrated superior accuracy and robustness against image noise and artifacts compared to the center-of-mass method.

Conclusions:

The developed HT algorithm provides highly accurate and robust radiation field center localization.
The method is suitable for applications like Winston-Lutz tests and evaluating radiation center wobble.
This advancement contributes to improved precision and reduced uncertainty in radiation therapy delivery.