Fast reconstruction of low dose proton CT by sinogram interpolation.

Area of Science:

• Medical Imaging
• Particle Physics
• Radiotherapy

Background:

• Proton computed tomography (CT) is crucial for accurate particle therapy planning, enhancing dose calculations by minimizing range errors.
• Traditional iterative reconstruction methods for proton CT achieve high resolution but are computationally intensive.
• Direct reconstruction techniques offer faster processing but historically required higher imaging doses.

Purpose of the Study:

• To adapt direct reconstruction methods for low-dose proton CT imaging.
• To compare the image quality and resolution of low-dose direct reconstruction with state-of-the-art iterative algorithms.
• To evaluate the efficiency and speed improvements of direct reconstruction in proton CT.

Main Methods:

• Developed an extended methodology for direct reconstruction applicable to low imaging doses in proton CT.
• Compared the image quality and resolution of the direct method against three advanced iterative reconstruction algorithms.
• Assessed the computational time and speedup achieved by the direct reconstruction method.

Main Results:

• The direct reconstruction method achieved image quality and resolution comparable to iterative methods, even at low imaging doses (1 mSv).
• The direct method demonstrated a twentyfold speedup in reconstruction time compared to previously published iterative algorithms.
• Low-dose direct reconstruction provides a viable alternative to iterative techniques for proton CT.

Conclusions:

• Direct reconstruction is a promising technique for proton CT, offering comparable image quality to iterative methods at significantly reduced reconstruction times.
• The developed low-dose direct reconstruction method enhances the feasibility of proton CT for clinical applications in particle therapy.
• This advancement in proton CT reconstruction balances image quality, dose efficiency, and computational speed.