The impact of iterative reconstruction protocol, signal-to-background ratio and background activity on measurement of PET spatial resolution.
Objectives: The present study aims to assess the impact of acquisition time, different iterative reconstruction protocols as well as image context (including contrast levels and background activities) on the measured spatial resolution in PET images.Methods: Discovery 690 PET/CT scanner was used to...
| Publicado en: | Japanese Journal of Radiology Vol. 38; no. 3; pp. 231 - 240 |
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| Autores principales: | , , , , , , |
| Formato: | Journal Article |
| Publicado: |
Springer Nature
Mar2020
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| Acceso en línea: | Ver este registro en EBSCOhost |
| fields | @attributes: recordID: 1 pdfLink: plink: https://search.ebscohost.com/login.aspx?direct=true&db=ccm&AN=142128917&site=ehost-live header: @attributes: shortDbName: ccm uiTerm: 142128917 longDbName: CINAHL Complete uiTag: AN controlInfo: bkinfo: dissinfo: jinfo: jid: 18671071 AUCM jtl: Japanese Journal of Radiology issn: 18671071 maglogo: N pubinfo: dt: Mar2020 vid: 38 iid: 3 pid: 237 pub: Springer Nature place: New York, New York artinfo: ui: 142128917 142128917 NLM31894449 10.1007/s11604-019-00914-3 NLM31894449 142128917 ppf: 231 ppct: 9 formats: fmt: – @attributes: type: T – @attributes: type: P tig: atl: The impact of iterative reconstruction protocol, signal-to-background ratio and background activity on measurement of PET spatial resolution. aug: au: Rezaei, Sahar Ghafarian, Pardis Bakhshayesh-Karam, Mehrdad Uribe, Carlos F. Rahmim, Arman Sarkar, Saeed Ay, Mohammad Reza affil: Department of Medical Physics and Biomedical Engineering, Tehran University of Medical Sciences, Tehran, Iran sug: subj: Image Processing, Computer Assisted Methods Tomography, Emission-Computed Methods Phantoms, Imaging Reproducibility of Results Algorithms Sensitivity and Specificity Arthritis Impact Measurement Scales Impact of Events Scale ab: Objectives: The present study aims to assess the impact of acquisition time, different iterative reconstruction protocols as well as image context (including contrast levels and background activities) on the measured spatial resolution in PET images.Methods: Discovery 690 PET/CT scanner was used to quantify spatial resolutions in terms of full width half maximum (FWHM) as derived (i) directly from capillary tubes embedded in air and (ii) indirectly from 10 mm-diameter sphere of the NEMA phantom. Different signal-to-background ratios (SBRs), background activity levels and acquisition times were applied. The emission data were reconstructed using iterative reconstruction protocols. Various combinations of iterations and subsets (it × sub) were evaluated.Results: For capillary tubes, improved FWHM values were obtained for higher it × sub, with improved performance for PSF algorithms relative to non-PSF algorithms. For the NEMA phantom, by increasing acquisition times from 1 to 5 min, intrinsic FWHM for reconstructions with it × sub 32 (54) was improved by 15.3% (13.2%), 15.1% (13.8%), 14.5% (12.8%) and 13.7% (12.7%) for OSEM, OSEM + PSF, OSEM + TOF and OSEM + PSF + TOF, respectively. Furthermore, for all reconstruction protocols, the FWHM improved with more impact for higher it × sub.Conclusion: Our results indicate that PET spatial resolution is greatly affected by SBR, background activity and the choice of the reconstruction protocols. pubtype: Academic Journal doctype: Journal Article ougenre: Article language: English refInfo: holdings: @attributes: islocal: N |
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