First biological images with high-energy proton microscopy

Area of Science:

• Medical Physics
• Radiological Imaging

Background:

• High-energy proton radiography offers unique penetrating imaging capabilities, including high spatial resolution and density dynamic range.
• This technique enables reconstruction of density variations within volumes and in situ environments.

Purpose of the Study:

• To evaluate the feasibility of using high-energy proton microscopy for image-guided stereotactic particle radiosurgery.
• To present results from initial tests imaging biological and tissue-equivalent targets.

Main Methods:

• Utilized an 800 MeV proton microscope setup optimized for dynamic experiments.
• Acquired images with approximately 10^10 protons per image to achieve high spatial resolution.

Main Results:

• Achieved a spatial resolution of 150 μm when imaging biological and tissue-equivalent targets.
• Demonstrated the capability of proton microscopy for detailed target visualization.

Conclusions:

• High-energy proton microscopy shows promise for real-time, high-resolution online imaging in proton radiosurgery.
• The technique's potential for image-guided particle radiosurgery is supported by these initial findings.