A novel method for measuring the backscatter factor on a curved surface for diagnostic X-rays using a flexible...

Area of Science:

• Medical Physics
• Radiation Dosimetry
• Materials Science

Background:

• Effective dose calculation relies on backscatter factors (BSFs).
• Current methods often use flat-surface BSFs, which are inaccurate for curved surfaces like the human body.
• Conventional dosimeters struggle to measure BSFs on curved surfaces due to their rigid sensitive volumes.

Purpose of the Study:

• To develop and validate a method for measuring backscatter factors (BSFs) on curved surfaces.
• To assess the utility of a novel flexible scintillator for accurate radiation dosimetry.
• To improve the accuracy of dose management in medical imaging applications.

Main Methods:

• A flexible scintillator was fabricated using Gadolinium Aluminum Gallium Oxide (GAGG) scintillator powder and silicone adhesive.
• The scintillator was attached to a cylindrical phantom to simulate curved surfaces.
• Backscatter factors (BSFs) were measured by comparing light output with and without the phantom under diagnostic X-ray irradiation.

Main Results:

• The flexible scintillator successfully measured BSFs on a curved surface.
• Experimental BSF measurements showed excellent agreement with simulation results for a cylindrical phantom.
• The mean difference between experimental and simulated BSFs was 0.43%, with a maximum difference of 1.47% at 40 kV.

Conclusions:

• The flexible scintillator is a viable tool for measuring BSFs on curved surfaces.
• This method enhances the accuracy of radiation dose assessment in medical imaging.
• The findings contribute to improved dose management strategies for patients.