Vet Comp Orthop Traumatol 2020; 33(01): 045-050
DOI: 10.1055/s-0039-3399524
Original Research
Georg Thieme Verlag KG Stuttgart · New York

Improved Computed Tomography Accuracy with a 1-mm versus 2- or 3-mm Slice Thickness for the Detection of Medial Coronoid Disease in Dogs

Raffaela T. Zweifel
1  Department of Veterinary Clinical Sciences, Clinic for Small Animals, Justus Liebig University, Giessen, Germany
,
Pamela DiDonato
1  Department of Veterinary Clinical Sciences, Clinic for Small Animals, Justus Liebig University, Giessen, Germany
,
Antje Hartmann
2  Department of Diagnostic Imaging, Clinic for Small Animals Hofheim, Hofheim, Germany
,
Martin Kramer
1  Department of Veterinary Clinical Sciences, Clinic for Small Animals, Justus Liebig University, Giessen, Germany
,
Kerstin H. von Pückler
1  Department of Veterinary Clinical Sciences, Clinic for Small Animals, Justus Liebig University, Giessen, Germany
› Author Affiliations
Funding None.
Further Information

Publication History

07 May 2019

24 September 2019

Publication Date:
22 November 2019 (online)

Abstract

Objective Computed tomography (CT) is used complementarily to radiography for the evaluation of medial coronoid disease (MCD). We hypothesized that a slice thickness > 2 mm would significantly affect the image quality and detection of fragmentation of the medial coronoid process. This study aimed to assess CT features indicating direct and indirect evidence of MCD in 168 CT studies with slice thicknesses of 1-, 2- and 3 mm.

Materials and Methods The CT studies were blinded in terms of CT slice thickness and patient data and randomly assessed by two independent observers. All dogs underwent arthroscopic evaluation of the elbow joints. Both observers were unaware of the arthroscopic findings.

Results Notably, blurring of the bone contour (p = 0.0001) was significantly influenced by slice thickness; here, a 1-mm thickness yielded a predominantly sharp and well-defined bone contour (observer 1, 91%; observer 2, 79%), whereas 2- (observer 1, 39.3%; observer 2, 56.3%) and especially 3-mm slice thicknesses yielded blurred margins with significantly reduced sharpness (observer 1, 0%; observer 2, 12.5%). The 1-mm slice thickness also yielded the highest fragment detection rate (observer 1, 55.4%; observer 2, 60.4%). Furthermore, the detection of fragment positions and of single fragments and fissures differed substantially with slice thickness.

Clinical Relevance The findings of this study support the hypothesis that a CT slice thickness of ≥ 2 mm significantly affects fragment detection. In conclusion, a CT slice thickness of at least 1 mm is recommended for the assessment of MCD of the canine elbow.

Note

Portions of this study were published as an abstract and presented at the 2015 Annual Scientific Meeting of the International Veterinary Radiology Association Meeting, Fremantle, Western Australia.


Authors' Contributions

All authors contributed to conception of study, study design, acquisition of data and data analysis and interpretation. All authors also drafted, revised and approved the submitted manuscript.