Related Experiment Video
Updated: May 25, 2026
08:34
Proton Therapy Delivery and Its Clinical Application in Select Solid Tumor Malignancies
Published on: February 6, 2019
Gamma electron vertex imaging and application to beam range verification in proton therapy
Chan Hyeong Kim1, Jin Hyung Park, Hee Seo
1Department of Nuclear Engineering, Hanyang University, Seoul, Republic of Korea. chkim@hanyang.ac.kr
Medical Physics
|February 11, 2012
Summary
A new gamma-ray imaging method, gamma electron vertex imaging (GEVI), precisely verifies proton therapy beam range. Simulations show GEVI achieves 2-3 mm accuracy, with potential for submillimeter precision in clinical applications.
Area of Science:
- Medical Physics
- Nuclear Imaging
- Radiation Oncology
Background:
- Proton therapy offers precise radiation delivery but requires accurate beam range verification.
- Current verification methods have limitations in accuracy and real-time application.
Purpose of the Study:
- Introduce and evaluate a novel gamma-ray imaging technique called gamma electron vertex imaging (GEVI).
- Assess GEVI's capability for precise proton beam range verification in proton therapy.
Main Methods:
- GEVI utilizes Compton scattering to convert gamma rays into electrons, which are then traced by hodoscopes.
- Monte Carlo simulations using geant4 (QGSP_BIC_HP physics package) were employed to evaluate GEVI's performance.
Main Results:
- Simulations demonstrated GEVI's ability to determine proton beam range with 2-3 mm accuracy under simplified conditions.
- Potential for submillimeter accuracy in proton beam range measurement is expected with further development.
Conclusions:
- GEVI shows significant potential for improving the accuracy of proton beam range verification in patients.
- Enhanced accuracy can lead to better treatment effectiveness and patient safety through precise dose conformation.
Related Concept Videos
01:07Scanning Electron Microscopy
A scanning electron microscope (SEM) is used to study the surface features of a sample by using an electron beam that scans the sample surface in a two-dimensional manner. Typically, areas between ~1 centimeter to 5 micrometers in width can be imaged. SEM can be used to image bacteria, viruses, tissues as well as larger samples like insects. Conventional SEM gives a magnification ranging from 20X to 30,000X and spatial resolution of 50 to 100 nanometers.
Fundamental Principles
Accelerated...
Fundamental Principles
Accelerated...
01:29Positron Emission Tomography
Positron emission tomography (PET) is a medical imaging technique involving radiopharmaceuticals — substances that emit short-lived radiation. Although the first PET scanner was introduced in 1961, it took 15 more years before radiopharmaceuticals were combined with the technique and revolutionized its potential.
One of the main requirements of a PET scan is a positron-emitting radioisotope, which is produced in a cyclotron and then attached to a substance used by the part of the body being...
One of the main requirements of a PET scan is a positron-emitting radioisotope, which is produced in a cyclotron and then attached to a substance used by the part of the body being...