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Article Abstract
Background: We aim to assess the spill-in effect and the benefit in quantitative accuracy for [F]-NaF PET/CT imaging of abdominal aortic aneurysms (AAA) using the background correction (BC) technique.
Methods: Seventy-two datasets of patients diagnosed with AAA were reconstructed with ordered subset expectation maximization algorithm incorporating point spread function (PSF). Spill-in effect was investigated for the entire aneurysm (AAA), and part of the aneurysm excluding the region close to the bone (AAA). Quantifications of PSF and PSF+BC images using different thresholds (% of max. SUV in target regions-of-interest) to derive target-to-background (TBR) values (TBR, TBR, TBR and TBR) were compared at 3 and 10 iterations.
Results: TBR differences were observed between AAA and AAA due to spill-in effect from the bone into the aneurysm. TBR showed the highest sensitivity to the spill-in effect while TBR showed the least. The spill-in effect was reduced at 10 iterations compared to 3 iterations, but at the expense of reduced contrast-to-noise ratio (CNR). TBR yielded the best trade-off between increased CNR and reduced spill-in effect. PSF+BC method reduced TBR sensitivity to spill-in effect, especially at 3 iterations, compared to PSF (P-value ≤ 0.05).
Conclusion: TBR is robust metric for reduced spill-in and increased CNR.
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| http://www.ncbi.nlm.nih.gov/pmc/articles/PMC8873073 | PMC |
| http://dx.doi.org/10.1007/s12350-020-02220-2 | DOI Listing |
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