Development of a Head Scanner for Proton CT.

Area of Science:

• Medical Physics
• Radiological Imaging
• Radiation Oncology

Background:

• Proton therapy requires accurate dose calculations, which depend on precise tissue density information.
• Current imaging techniques may not provide sufficient accuracy for proton stopping power determination.
• Proton Computed Tomography (pCT) offers a potential solution for superior range verification.

Purpose of the Study:

• To introduce a novel head scanner designed for Proton Computed Tomography (pCT).
• To enable accurate reconstruction of proton stopping power (S.P.) maps in phantoms and patients.
• To support proton therapy treatment planning with enhanced imaging capabilities.

Main Methods:

• The pCT system utilizes two silicon telescopes for proton tracking before and after the object.
• An energy detector measures residual proton energy to determine Water Equivalent Path Length (WEPL).
• The system is informed by prototype experience and extensive Geant4 simulations.

Main Results:

• The developed pCT scanner is designed to reconstruct accurate stopping power maps.
• The system is capable of handling clinically relevant proton fluxes.
• Simulations and prototype data support the feasibility of the new scanner.

Conclusions:

• The new pCT head scanner represents a significant advancement for proton therapy.
• Accurate S.P. mapping is crucial for precise proton range prediction in treatment planning.
• This technology has the potential to improve patient outcomes in proton therapy.