A partial volume effect correction tailored for 18F-FDG-PET oncological studies.

Area of Science:

• Nuclear Medicine
• Medical Imaging
• Oncology

Background:

• Partial volume effect (PVE) in Positron Emission Tomography (PET) can lead to underestimation of radioactivity in small oncological lesions.
• Accurate quantification of radiotracer uptake is crucial for effective cancer diagnosis and treatment monitoring.

Purpose of the Study:

• To develop, optimize, and validate a novel PVE correction method for oncological lesions in PET clinical studies.
• To improve the accuracy of lesion quantification by addressing PVE in PET imaging.

Main Methods:

• Developed an operator-independent technique using an optimized threshold of maximum lesion uptake to define an isocontour.
• Experimentally derived recovery coefficients (RC) based on PET measurements of lesion-to-background ratio (L/B m) and lesion metabolic volume.
• Validated the method using phantom studies and patient data for lesions ranging from 10 mm to 40 mm.

Main Results:

• The PVE correction method demonstrated high accuracy (>89%) for lesions larger than 1 cm in diameter under clinical conditions.
• The method successfully recovered over 76% of radioactivity for lesions smaller than 1 cm.
• Experimental RC curves were generated as a function of measured L/B m and metabolic volume.

Conclusions:

• The proposed PVE correction method is accurate, feasible, and suitable for clinical application in PET oncology.
• This technique enhances the quantification of oncological lesions, potentially impacting clinical decision-making.
• The method provides a reliable approach to address PVE in diverse oncological lesion scenarios.