Assessment of image quality in photon-counting detector computed tomography of the wrist - An ex vivo study

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Kämmerling, NinaLinköpings universitet,Institutionen för hälsa, medicin och vård,Medicinska fakulteten,Region Östergötland, Röntgenkliniken i Linköping (author)

Assessment of image quality in photon-counting detector computed tomography of the wrist - An ex vivo study

Article/chapterEnglish2022

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Elsevier Ireland Ltd,2022
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LIBRIS-ID:oai:DiVA.org:liu-187292
https://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-187292URI
https://doi.org/10.1016/j.ejrad.2022.110442DOI

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Language:English
Summary in:English

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Subject category:art swepub-publicationtype

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Funding Agencies|ALF Grants [RO?]
Purpose: The aim of this study was to evaluate the effect of reconstruction parameters on image quality in wrist imaging using photon-counting detector CT (PCD-CT) and to compare the results with images from an energyintegrating detector CT (EID-CT). Methods: Twelve cadaveric wrist specimens were examined using a prototype PCD-CT and a clinical EID-CT using similar radiation dose. Reconstruction parameters were matched between scanners. Also, sharper reconstruction kernels, a larger matrix size, and smaller slice thicknesses were evaluated for PCD-CT. Image noise, contrast-tonoise ratio (CNR) and image sharpness in trabecular structures were quantitatively measured. Image quality with respect to the visibility of cortical and trabecular bone structures was assessed by six radiologists using visual grading methods.Results: Images obtained with PCD-CT had lower noise (42.6 +/- 3.9 HU vs 75.1 +/- 6.3 HU), higher CNR (38.9 +/- 4.5 vs 19.0 +/- 2.4) and higher trabecular sharpness (63.5 +/- 6.0 vs 53.7 +/- 8.5) than those obtained with EID-CT using similar scan and reconstruction parameters (p < 0.001). The image sharpness in trabecular structures was further improved by using sharper kernels, despite higher noise levels. Radiologists had a strong preference for PCD-CT images both in terms of spatial resolution and suitability for bone imaging. Visual grading analysis showed an improved visibility of cortical bone, trabeculae and nutritive canals (p < 0.005).Conclusion: PCD-CT offers improved image quality regarding bone structures in the wrist relative to EID-CT systems, particularly when sharper reconstruction kernels, smaller slice thickness and a larger image matrix size are used.

Subject headings and genre

TEKNIK OCH TEKNOLOGIER Medicinteknik Medicinsk bildbehandling hsv//swe
ENGINEERING AND TECHNOLOGY Medical Engineering Medical Image Processing hsv//eng
Computed tomography; Wrist; Diagnostic imaging; Image quality enhancement; Bone

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Sandstedt, MårtenLinköpings universitet,Avdelningen för diagnostik och specialistmedicin,Medicinska fakulteten,Centrum för medicinsk bildvetenskap och visualisering, CMIV,Region Östergötland, Röntgenkliniken i Linköping(Swepub:liu)marsa80 (author)
Farnebo, SimonLinköpings universitet,Avdelningen för kirurgi, ortopedi och onkologi,Medicinska fakulteten,Region Östergötland, Hand- och plastikkirurgiska kliniken US(Swepub:liu)simfa69 (author)
Persson, AndersLinköpings universitet,Avdelningen för diagnostik och specialistmedicin,Medicinska fakulteten,Centrum för medicinsk bildvetenskap och visualisering, CMIV,Region Östergötland, Röntgenkliniken i Linköping(Swepub:liu)andpe75 (author)
Tesselaar, ErikLinköpings universitet,Avdelningen för diagnostik och specialistmedicin,Medicinska fakulteten,Region Östergötland, Medicinsk strålningsfysik(Swepub:liu)eridr03 (author)
Linköpings universitetInstitutionen för hälsa, medicin och vård (creator_code:org_t)

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In:European Journal of Radiology: Elsevier Ireland Ltd1540720-048X1872-7727

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By the author/editor: Kämmerling, Nina; Sandstedt, Mårte ...; Farnebo, Simon; Persson, Anders; Tesselaar, Erik

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ENGINEERING AND TECHNOLOGY: ENGINEERING AND ...; and Medical Engineer ...; and Medical Image Pr ...

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