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176 results on '"Kneissl S"'

19. Die KLIPP-VET: Eine praktisch-klinische Prüfung im OSCE-Format [Bericht über Entwicklungsprozess]

Author

Buchner, H., Preusche, I., and Kneissl, S.

Subjects
ddc: 610, 610 Medical sciences, Medicine
Abstract

Problemstellung/Ziele: Im Rahmen eines neuen modularisierten veterinärmedizinischen Curriculums mußte nach den klinischen Rotationen am Ende des allgemeinen Studiums eine klinisch-praktische Prüfung entwickelt werden. Verschiedene Tierarten, Fachdisziplinen und medizinische Schritte[zum vollständigen Text gelangen Sie über die oben angegebene URL], Jahrestagung der Gesellschaft für Medizinische Ausbildung (GMA)

Published
2018

48. Computed Tomographic Anatomy of the Canine Temporal Bone.

Author

Probst, A. and Kneissl, S.

Subjects
*ANATOMY, *TEMPORAL bone, *DOGS, *ANIMAL breeds, *BEAGLE (Dog breed), *TOMOGRAPHY, *TISSUES, *CAROTID artery, *MAGNETIC resonance imaging
Abstract

This study aims to identify and describe structures of the temporal bone in normal dogs that can be depicted using computed tomography (CT). Five normal dogs of different breeds and both sexes ranging from 0.5 to 8 years were used as the study material. CT images of 2 mm thickness without abnormalities in the temporal bone were reviewed and analysed in bone and soft tissue settings. All images were compared with corresponding E 12 plastic-embedded cross sections of 3 mm thickness, which were acquired from anatomic cross sections of frozen beagles. The sections were provided from the Department of Pathobiology (Institute of Anatomy). CT is able to image all relevant bony structures within the temporal bone. Concerning soft tissue structures, CT allows their localization by using bony markers, i.e. the internal acustic meatus for the cranial nerves VII and VIII or the canals for the internal carotid artery and the temporal sinus. The provided reference images are meant to improve orientation within the complex anatomy of the temporal bone. On condition that slice thickness is equal to or smaller than 2 mm and bony setting is supplied, CT is able to visualize all relevant structures within the temporal bone. However, in clinical settings the combined look on air, liquids and bone as well as the contrast enhancement of soft tissues might prefer magnetic resonance imaging to CT. [ABSTRACT FROM AUTHOR]

Published
2006
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49. Comparison of susceptibility artifacts generated by microchips with different geometry at 1.5 Tesla magnet resonance imaging. A phantom pilot study referring to the ASTM standard test method F2119–07

Author

Dengg, S. and Kneissl, S.

Abstract

Objective: Ferromagnetic material in microchips, used for animal identification, causes local signal increase, signal void or distortion (susceptibility artifact) on MR images. To measure the impact of microchip geometry on the artifact’s size, an MRI phantom study was performed. Material and methods: Microchips of the labels Datamars®, Euro-I.D.® and Planet-ID® (n  =  15) were placed consecutively in a phantom and examined with respect to the ASTM Standard Test Method F2119–07 using spin echo (TR 500 ms, TE 20 ms), gradient echo (TR 300 ms, TE 15 ms, flip angel 30°) and otherwise constant imaging parameters (slice thickness 3 mm, field of view 250 x 250 mm, acquisition matrix 256 x 256 pixel, bandwidth 32 kHz) at 1.5 Tesla. Image acquisition was undertaken with a microchip positioned in the x- and z-direction and in each case with a phase-encoding direction in the y- and z-direction. The artifact size was determined with a) a measurement according to the test method F2119–07 using a homogeneous point operation, b) signal intensity measurement according to Matsuura et al. and c) pixel counts in the artifact according to Port and Pomper. Results: There was a significant difference in artifact size between the three microchips tested (Wilcoxon p = 0.032). A two- to three-fold increase in microchip volume generated an up to 76% larger artifact, depending on the sequence type, phase-encoding direction and chip position to B0. Conclusion and clinical relevance: The smaller the microchip geometry, the less is the susceptibility artifact. Spin echoes (SE) generated smaller artifacts than gradient echoes (GE). In relation to the spatial measurement of the artifact, the switch in phase-encoding direction had less influence on the artifact size in GE- than in SE-sequences. However, the artifact shape and direction of SE-sequences can be changed by altering the phase. The artifact size, caused by the microchip, plays a major clinical role in the evaluation of MRI from the head, shoulder and neck regions.

Published
2013

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