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Beck, Tobias; Kilchling, Tim P. and Meyer-Lindenberg, Andrea (2019): Differences between mu CT-imaging and conventional CT for the diagnosis of possible diseases of the middle and inner cat ear. In: Anatomia Histologia Embryologia, Vol. 48, No. 3: pp. 268-276

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The aim of this study was to check the relevance of using in-vivo micro computed tomography (a mu CT) for the diagnosis of possible diseases of the middle and inner ear of the cat. Therefore, on the one hand, differences of the detail detectability between the two imaging methods conventional computed tomography (cCT) and in-vivo a mu CT were analyzed. Six healthy cat ears were dissected and scanned several times and the obtained images were compared with each other. On the other hand, histological slices of all ears were prepared and pictures of defined anatomical structures were taken and compared with the identical sectional plane of the a mu CT-images. This way it was possible to evaluate the quality and clinical limitations of the in-vivo a mu CT. The results show that an in-vivo a mu CT is suitable to analyze even the smallest osseous structures, such as the semicircular ducts, the spiral osseous lamina or the ossicles whereas with the help of cCT it is not possible to identify such small osseous structures because of their blurred and less detailed representation. Delicate soft tissue structures as the membranous labyrinth including hearing and vestibular organ cannot be differentiated with as well in-vivo a mu CT- as with cCT-images. In-vivo a mu CT represent a good possibility for more detailed diagnosis of extremely fine structures which cannot be detected with cCT. Histological slices can nonetheless not be replaced by in-vivo a mu CT due to a too low spatial resolution and the limitations of the in-vivo a mu CT with regard to the evaluation of soft tissue dense structures.

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