Anatomy-constrained modelling of image-derived input functions in dynamic PET using multi-organ segmentation
This incremental improvement addresses the need for more accurate tracer kinetic modelling in clinical PET imaging for medical professionals.
The study tackled the problem of inaccurate kinetic analysis in dynamic PET by proposing a multi-organ segmentation-based approach to model image-derived input functions from multiple anatomical sources, resulting in a mean squared error reduction of 13.39% for the liver and 10.42% for the lungs.
Accurate kinetic analysis of [$^{18}$F]FDG distribution in dynamic positron emission tomography (PET) requires anatomically constrained modelling of image-derived input functions (IDIFs). Traditionally, IDIFs are obtained from the aorta, neglecting anatomical variations and complex vascular contributions. This study proposes a multi-organ segmentation-based approach that integrates IDIFs from the aorta, portal vein, pulmonary artery, and ureters. Using high-resolution CT segmentations of the liver, lungs, kidneys, and bladder, we incorporate organ-specific blood supply sources to improve kinetic modelling. Our method was evaluated on dynamic [$^{18}$F]FDG PET data from nine patients, resulting in a mean squared error (MSE) reduction of $13.39\%$ for the liver and $10.42\%$ for the lungs. These initial results highlight the potential of multiple IDIFs in improving anatomical modelling and fully leveraging dynamic PET imaging. This approach could facilitate the integration of tracer kinetic modelling into clinical routine.