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Nuklearmedizin 2018; 57(04): 153-159
DOI: 10.3413/Nukmed-0953-17-12
Original Article
Georg Thieme Verlag

Image Quality Assessment for Low-Dose-CT in Hybrid SPECT/CT Imaging

Bildqualität-Bewertungsmethode für Niedrigdosis-Computertomographie bei der Hybridbildgebung (SPECT/CT)
Oliver S. Grosser
1   Department of Radiology and Nuclear Medicine, University Hospital Magdeburg, Magdeburg, Germany
,
Juri Ruf
2   Department of Nuclear Medicine, Medical Centre, University of Freiburg, Faculty of Medicine, University of Freiburg, Freiburg, Germany
,
Dennis Kupitz
1   Department of Radiology and Nuclear Medicine, University Hospital Magdeburg, Magdeburg, Germany
,
Damian Czuczwara
1   Department of Radiology and Nuclear Medicine, University Hospital Magdeburg, Magdeburg, Germany
,
David Loewenthal
1   Department of Radiology and Nuclear Medicine, University Hospital Magdeburg, Magdeburg, Germany
,
Markus Thormann
1   Department of Radiology and Nuclear Medicine, University Hospital Magdeburg, Magdeburg, Germany
,
Christian Furth
1   Department of Radiology and Nuclear Medicine, University Hospital Magdeburg, Magdeburg, Germany
3   Charité – Universitätsmedizin Berlin, corporate member of Freie Universität Berlin, Humboldt-Universität zu Berlin, and Berlin Institute of Health, Department of Nuclear Medicine, Berlin, Germany
,
Jens Ricke
1   Department of Radiology and Nuclear Medicine, University Hospital Magdeburg, Magdeburg, Germany
4   Department of Clinical Radiology, Munich University Hospitals, Grosshadern, Ludwig Maximilians University, Munich, Germany
,
Maciej Pech
1   Department of Radiology and Nuclear Medicine, University Hospital Magdeburg, Magdeburg, Germany
,
Michael C. Kreissl
1   Department of Radiology and Nuclear Medicine, University Hospital Magdeburg, Magdeburg, Germany
,
Holger Amthauer
1   Department of Radiology and Nuclear Medicine, University Hospital Magdeburg, Magdeburg, Germany
3   Charité – Universitätsmedizin Berlin, corporate member of Freie Universität Berlin, Humboldt-Universität zu Berlin, and Berlin Institute of Health, Department of Nuclear Medicine, Berlin, Germany
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Publikationsverlauf

received: 19. Dezember 2017

accepted: 25. Juni 2018

Publikationsdatum:
20. August 2018 (online)

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Summary

Objectives: Low-dose-computed tomography (LD-CT) is used in nuclear medicine hybrid imaging (e.g., SPECT/CT) for attenuation correction of emission data and anatomical correlation of findings. However, there are currently no standards for image quality (e. g., detectability) comparable to those for diagnostic CT. Therefore, the aim of this explorative study was to evaluate retrospective LDCT data in terms of CT image quality and detectability of anatomical structures. Methods: Two readers blindly scored abdominal LD-CT images (n = 40 patients) in terms of detectability (n = 20 structures/patient), image quality, and readers’ confidence in scoring the image quality for a clinically hybrid imaging protocol. Results were analysed by ANOVA to identify factors (e. g., anatomical structures) that influenced performance scores. The inter-rater agreement was evaluated by determining the chance-corrected Cohen’s Kappa coefficient. Results: Image noise was acceptable for anatomical correlation in 96.1 % of the readings with an almost perfect inter-rater agreement (KBP = 0.85). A detectability of at least 80 % was observed in 13/20 (KBP ≥ 0.7) and 90 % in 9/20 (KBP ≥ 0.85) of the structures analysed by both readers. The confidence of both readers in scoring image quality was at least sufficient in 98.8 % of the examined patients (KBP = 0.95). Conclusion: Although LD-CT protocols commonly used in hybrid imaging have a poor image quality not suitable for primary CT diagnostics, they enable detection of a variety of anatomical structures. LDCT can therefore also be referenced in the associated reports for anatomical correlation of findings from SPECT imaging.

Keywords

SPECT/CT - Low-Dose-CT - Hybrid imaging - Detectability - Image quality
 

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