| Autor: |
Marcus Unterrainer, Franziska Vettermann, Matthias Brendel, Adrien Holzgreve, Michael Lifschitz, Matthias Zähringer, Bogdana Suchorska, Vera Wenter, Ben M. Illigens, Peter Bartenstein, Nathalie L. Albert |
| Jazyk: |
angličtina |
| Rok vydání: |
2017 |
| Předmět: |
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| Zdroj: |
EJNMMI Research, Vol 7, Iss 1, Pp 1-8 (2017) |
| Druh dokumentu: |
article |
| ISSN: |
2191-219X |
| DOI: |
10.1186/s13550-017-0295-y |
| Popis: |
Abstract Background PET with O-(2-18F-fluoroethyl)-L-tyrosine (18F-FET) has reached increasing clinical significance for patients with brain neoplasms. For quantification of standard PET-derived parameters such as the tumor-to-background ratio, the background activity is assessed using a region of interest (ROI) or volume of interest (VOI) in unaffected brain tissue. However, there is no standardized approach regarding the assessment of the background reference. Therefore, we evaluated the intra- and inter-reader variability of commonly applied approaches for clinical 18F-FET PET reading. The background activity of 20 18F-FET PET scans was independently evaluated by 6 readers using a (i) simple 2D-ROI, (ii) spherical VOI with 3.0 cm diameter, and (iii) VOI consisting of crescent-shaped ROIs; each in the contralateral, non-affected hemisphere including white and gray matter in line with the European Association of Nuclear Medicine (EANM) and German guidelines. To assess intra-reader variability, each scan was evaluated 10 times by each reader. The coefficient of variation (CoV) was assessed for determination of intra- and inter-reader variability. In a second step, the best method was refined by instructions for a guided background activity assessment and validated by 10 further scans. Results Compared to the other approaches, the crescent-shaped VOIs revealed most stable results with the lowest intra-reader variabilities (median CoV 1.52%, spherical VOI 4.20%, 2D-ROI 3.69%; p |
| Databáze: |
Directory of Open Access Journals |
| Externí odkaz: |
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