Seminars in Musculoskeletal Radiology, Inhaltsverzeichnis

Semin Musculoskelet Radiol 2020; 24(S 01): S1-S8
DOI: 10.1055/s-0040-1709559

Scientific Presentations and Posters

Georg Thieme Verlag KG Stuttgart · New York

Virtual Noncontrast 3D-CT Reformats for Evaluation of the Glenoid in Patients with Dual-Energy CT Arthrography of the Shoulder

Christoph Stern

¹Radiology, Balgrist University Hospital, Zurich, Switzerland

²Faculty of Medicine, University of Zurich, Zurich, Switzerland

,

Magda Marcon

¹Radiology, Balgrist University Hospital, Zurich, Switzerland

²Faculty of Medicine, University of Zurich, Zurich, Switzerland

,

Samy Bouaicha

²Faculty of Medicine, University of Zurich, Zurich, Switzerland

³Department of Orthopaedic Surgery, Balgrist University Hospital, Zurich, Switzerland

,

Karl Wieser

²Faculty of Medicine, University of Zurich, Zurich, Switzerland

,

Andrea Rosskopf

¹Radiology, Balgrist University Hospital, Zurich, Switzerland

²Faculty of Medicine, University of Zurich, Zurich, Switzerland

,

Reto Sutter

¹Radiology, Balgrist University Hospital, Zurich, Switzerland

²Faculty of Medicine, University of Zurich, Zurich, Switzerland

› Institutsangaben

Introduction Three-dimensional (3D) evaluation of the osseous glenoid is preferred over two-dimensional by orthopaedic surgeons, but 3D-computed tomography (CT) reformats cannot be calculated from a CT after arthrography with the conventional technique. The purpose of this study was to evaluate the quality of virtual noncontrast (VNC) 3D-CT reformats of the glenoid for patients who received dual-energy computed tomography arthrography (DECT-A) of the shoulder with image postprocessing.

Material and Methods A total of 21 patients (33.2 ± 2.8 years of age) received a DECT scan of the shoulder (80 kV/140 kV) after arthrography with a reduced dose protocol (80 mg iodine/ml solution). VNC 3D-CT reformats were calculated with image postprocessing (syngo.via, Siemens Healthcare, Erlangen, Germany). Overall image quality of the reconstructed cross-sectional DECT-A images and the quality of the VNC 3D-CT reformats were evaluated on a 5-point Likert scale. Radiation dose parameters (CT dose index [CTDI], dose length product [DLP], and effective dose with a conversion factor of k = 0.014) and intra-articular contrast material enhancement measured on bone kernel images were calculated.

Results Calculation of VNC 3D-CT reformats was successful in 21 of 21 (100%) of DECT-A scans of shoulders. Cross-sectional overall image quality and the quality of the VNC 3D-CT reformats were rated good (4.1 and 3.9, respectively). Mean CTDI with standard deviation was 12.0 ± 5.7 mGy, DLP was 141.1 ± 72.3 mGy·cm, and effective dose was 1.97 ± 1.0 mSv. The mean intra-articular contrast material enhancement was 1167 ± 244 HU.

Conclusion With image postprocessing VNC, 3D-CT reformats of the glenoid can be calculated successfully from DECT-A with a reduced intra-articular dose of contrast material. Cross-sectional DECT-A images and VNC 3D-CT reformats showed good image quality.