Ultra-high Versus Standard Resolution Photon-Counting Detector CT Angiography for Imaging of Femoral Stents in a Cadaveric Perfusion Model

Viktor Hartung; Robin Hendel; Henner Huflage; Anne Marie Augustin; Jan-Peter Grunz; Florian Kleefeldt; Dominik Peter; Sven Lichthardt; Süleyman Ergün; Thorsten Alexander Bley; Philipp Gruschwitz

doi:10.1016/j.acra.2024.07.038

Ultra-high Versus Standard Resolution Photon-Counting Detector CT Angiography for Imaging of Femoral Stents in a Cadaveric Perfusion Model

Acad Radiol. 2024 Aug 6:S1076-6332(24)00474-4. doi: 10.1016/j.acra.2024.07.038. Online ahead of print.

Affiliations

¹ Department of Diagnostic and Interventional Radiology, University Hospital Würzburg, Würzburg, Germany (V.H., R.H., H.H., A.M.A., J.P.G., T.A.B., P.G.). Electronic address: [email protected].
² Department of Diagnostic and Interventional Radiology, University Hospital Würzburg, Würzburg, Germany (V.H., R.H., H.H., A.M.A., J.P.G., T.A.B., P.G.).
³ Department of Diagnostic and Interventional Radiology, University Hospital Würzburg, Würzburg, Germany (V.H., R.H., H.H., A.M.A., J.P.G., T.A.B., P.G.); Department of Interventional and Diagnostic Radiology, Klinikum Bayreuth, Bayreuth, Germany (A.M.A.).
⁴ Department of Diagnostic and Interventional Radiology, University Hospital Würzburg, Würzburg, Germany (V.H., R.H., H.H., A.M.A., J.P.G., T.A.B., P.G.); Department of Radiology, University of Wisconsin, Madison, Wisconsin, USA (J.P.G.).
⁵ Institute of Anatomy and Cell Biology, University Würzburg, Würzburg, Germany (F.K., S.E.).
⁶ Department of General, Visceral, Transplant, Vascular and Pediatric Surgery, Center of Operative Medicine, University Hospital Würzburg, Würzburg, Germany (D.P., S.L.).

PMID: 39112296
DOI: 10.1016/j.acra.2024.07.038

Abstract

Background and aims: The aim of this study was to investigate the imaging performance and quality differences of PCD-CT in standard resolution mode (SR) versus ultra-high resolution mode (UHR) in the lower extremity runoff of dose-matched CTAs in a human cadaveric model.

Methods: Extracorporeal perfusion of the upper leg was established in one fresh-frozen human cadaver via inguinal and popliteal accesses using a peristaltic pump. Seven peripheral stents were deployed in the SFA. Photon-counting CTAs were performed under contrast perfusion in SR and UHR mode with dose-equivalent 120kVp acquisition protocols (low-/ medium-/ high-dose: CTDI_Vol=3, 5, 10 mGy) and reconstructed with four vascular convolution kernels. Lumen visibility and contrast-to-noise ratio were compared using analyses of variance. Subjective image quality was assessed using a pairwise, forced-choice comparison software.

Results: Lumen visibility was equal for SR and UHR at the used dose levels. CNR increase by UHR was significant for (ultra-)sharp convolution kernels BV60 (3 mGy; UHR vs. SR, 19.9 ± 1.9 vs. 15.7 ± 1.6, p < 0.046) and BV76 (8.0 ± 0.6 vs. 5.4 ± 0.3, p < 0.001). The relative CNR increase was higher for low-dose than high-dose scans (BV76: 48% vs. 36% at high dose, p < 0.033). The CNR of the low-dose scan in UHR mode was comparable to the high-dose scan in SR mode when the ultra-sharp kernel was used (8.0 ± 0.6 vs. 9.1 ± 1.1, p > 0.760). Among UHR examinations, a significant increase in CNR could only be measured in BV76 (8.0 ± 0.6 (3 mGy) vs. 12.4 ± 0.9 (10 mGy), p < 0.001). Readers preferred subjective image quality of UHR for all kernels with BV76 being ranked highest.

Conclusion: The CNR increase in UHR mode is highest when combining low radiation dose and ultra-sharp reconstructions. Meanwhile, the subjective image quality in UHR mode generally supersedes SR images, suggesting further dose reduction potential.

Keywords: Image quality; Peripheral arterial disease; Peripheral arterial runoff; Photon-counting CT; Ultra-high resolution.