Small-animal imaging using clinical positron emission tomography/computed tomography and super-resolution

Area of Science:

• Medical Imaging
• Preclinical Research
• Biomedical Engineering

Background:

• Dedicated small-animal PET/CT scanners are expensive.
• Clinical PET/CT may be a cost-effective alternative for small-animal research.
• Concerns exist regarding spatial resolution and image quality with clinical scanners.

Purpose of the Study:

• To investigate the utility of clinical PET/CT for small-animal research.
• To assess image quality improvements using super-resolution techniques.
• To compare super-resolution with point spread function (PSF) modeling.

Main Methods:

• Acquired National Electrical Manufacturers Association (NEMA) NU 4 phantom and mouse data using a clinical PET/CT scanner.
• Performed conventional static and stepped scans.
• Reconstructed static scans with and without PSF modeling.
• Applied iterative deconvolution to stepped images for super-resolution.

Main Results:

• Super-resolution processing markedly improved image quality.
• Super-resolution avoided artifacts associated with PSF modeling.
• The 2 mm rod of the NU 4 phantom was visualized with high contrast.
• Major mouse structures were well resolved.

Conclusions:

• Clinical PET/CT with super-resolution provides acceptable image quality for many small-animal research applications.
• This approach offers a viable, cost-effective alternative to dedicated small-animal scanners.
• Further validation may be needed for highly demanding preclinical research.