Journal
EUROPEAN JOURNAL OF RADIOLOGY
Volume 84, Issue 10, Pages 1873-1878Publisher
ELSEVIER IRELAND LTD
DOI: 10.1016/j.ejrad.2015.06.025
Keywords
Positron emission tomography; Colorectal liver metastases; Signal-to-noise; Signal-to-background; Reconstruction
Funding
- National Institute for Health Research (NIHR) Oxford Biomedical Research Centre at Oxford University Hospitals NHS Trust and University of Oxford
- Cancer Research UK [16466] Funding Source: researchfish
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Purpose: Iterative reconstruction algorithms are widely used to reconstruct positron emission tomography computerised tomography (PET/CT) data. Lesion detection in the liver by 18F-fluorodeoxyglucose PET/CT (18F-FDG-PET/CT) is hindered by 18F-FDG uptake in background liver parenchyma. The aim of this study was to compare semi-quantitative parameters of histologically-proven colorectal liver metastases detected by 18F-FDG-PET/CT using data based on a Bayesian penalised likelihood (BPL) reconstruction, with data based on a conventional time-of-flight (ToF) ordered subsets expectation maximisation (OSEM) reconstruction. Methods: A BPL reconstruction algorithm was used to retrospectively reconstruct sinogram PET data. This data was compared with OSEM reconstructions. A volume of interest was placed within normal background liver parenchyma. Lesions were segmented using automated thresholding. Lesion maximum standardised uptake value (SUNmax), standard deviation of background liver parenchyma Shy, signal-to-background ratio (SBR), and signal-to-noise ratio (SNR) were collated. Data was analysed using paired Student's t-tests and the Pearson correlation. Results: Forty-two liver metastases from twenty-four patients were included in the analysis. The average lesion SUVmax increased from 8.8 to 11.6 (p < 0.001) after application of the BPL algorithm, with no significant difference in background noise. SBR increased from 4.0 to 4.9 (p < 0.001) and SNR increased from 10.6 to 13.1 (p < 0.001) using BPL. There was a statistically significant negative correlation between lesion size and the percentage increase in lesion SUVmax (p = 0.03). Conclusions: This BPL reconstruction algorithm improved SNR and SBR for colorectal liver metastases detected by 18F-FDG-PET/CT, increasing the lesion SUVmax without increasing background liver SUV or image noise. This may improve the detection of FDG-avid focal liver lesions and the diagnostic performance of clinical 18F-FDG-PET/CT in this setting, with the largest impact for small foci. (C) 2015 Elsevier Ireland Ltd. All rights reserved.
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