200 MeV proton radiography studies with a hand phantom using a prototype proton CT scanner

Area of Science:

• Medical Imaging
• Particle Physics Applications

Background:

• Proton radiography is crucial for patient alignment and verification in proton beam radiation therapy.
• Existing imaging techniques have limitations that proton imaging aims to address.

Purpose of the Study:

• To experimentally compare proton energy-loss and scattering radiography using a first-generation proton CT scanner prototype.
• To assess the potential of proton imaging as a new, low-dose medical imaging modality.

Main Methods:

• Utilized a proton CT scanner prototype on a clinical proton synchrotron research beam line.
• Generated proton energy-loss and scattering radiographs of a hand phantom using 200 MeV protons.

Main Results:

• Both energy-loss and scattering radiographs successfully displayed anatomical details of the hand phantom.
• Energy-loss radiography demonstrated noticeably higher resolution compared to scattering radiography.
• Scattering radiography may offer better soft tissue vs. bone contrast, warranting further investigation.

Conclusions:

• Proton radiography techniques show promise for medical imaging, with energy-loss radiography offering superior resolution.
• This study aids in optimizing next-generation clinical proton CT scanners.
• Proton imaging is nearing clinical availability as a potentially low-dose medical imaging modality.