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Updated: May 7, 2026
A Whole Body Dosimetry Protocol for Peptide-Receptor Radionuclide Therapy PRRT: 2D Planar Image and Hybrid 2D+3D SPECT/CT Image Methods
Published on: April 24, 2020
Recovery coefficients determination for partial volume effect correction in oncological PET/CT images considering the
Alexandre R Krempser1, Roberto M Ichinose, Antonio M F L Miranda de Sá
1Biomedical Engineering Program, Federal University of Rio de Janeiro (COPPE, UFRJ), Avenida Horácio Macedo, 2030, Cidade Universitária, Ilha do Fundão, Rio de Janeiro, RJ, 21941-914, Brazil, krempser@peb.ufrj.br.
Objectives:
The partial volume effect (PVE) has a great impact in quantitative PET/CT imaging. Correction methods have been recently proposed by many authors to make the image quantification more accurate. This work presents a methodology for determining the recovery coefficients (RCs) for PVE correction in PET/CT images. It was taken into account the radioactivity outside the field of view (FOV), which is expected in a patient image acquisition.
Methods:
The NEMA image quality phantom and the NEMA scatter phantom were used. The phantoms were filled with (18)F-FDG for different sphere-to-background ratios. The RCs have been determined from image acquisitions in a Siemens Biograph 16 Hi-Rez PET/CT scanner with and without the scatter phantom.
Results:
The RC values that ranged from 0.38 to 1.00 without the scatter phantom exhibited a wider variation when this latter was taken into account (from 0.27 to 1.02). This more realistic estimation must be considered if one takes into account that an incorrect SUV measure in tumors leads to errors in the evaluation of the response to therapy based on PET/CT images.
Conclusions:
The activity outside the FOV should be considered in RCs determination to improve the RC-based PVE correction method.
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