Optimising magnetic resonance image quality of the ear in healthy dogs

Wolf, Davina; Lüpke, Matthias; Wefstaedt, Patrick; Klopmann, Thilo von; Nölte, I.; Seifert, H

doi:10.1556/avet.59.2011.1.5

Cited by 5 publications

(8 citation statements)

References 14 publications

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“…These findings are in agreement with that mentioned by Kneissl et al (2004), Couturier et al (2005), Wolf et al (2011) in dogs, Gonçalves et al (2015) in horse and Juliano (2018)…”

Section: Discussionsupporting

confidence: 93%

“…The T2‐weighted and MIPs images were better than the T1‐weighted images as they enable a clear visualization of the fluid contained within the bony and membranous labyrinths with high signal intensity. These findings are in agreement with that mentioned by Kneissl et al (2004), Couturier et al (2005), Wolf et al (2011) in dogs, Gonçalves et al (2015) in horse and Juliano (2018) in human.…”

Section: Discussionsupporting

confidence: 93%

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Anatomy of the rabbit inner ear using computed tomography and magnetic resonance imaging

El-Hameed

El-Shafey

Metwally

et al. 2023

Anat Histol Embryol

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Anatomically, the inner ear is a highly complex organ of intricate design, composed of a bony labyrinth that encases the same-shaped membranous labyrinth. It is difficult to study the three-dimensional anatomy of the inner ear because the relevant structures are very small and embedded within the petrous temporal bone, one of the densest bones in the body. The current study aimed to provide a detailed anatomic reference for the normal anatomy of the rabbit's inner ear. As a study model, ten healthy adults New Zealand White rabbit heads were used. Six heads were used for macroscopic evaluation of the bony and membranous labyrinths. The remaining four heads were evaluated radiographically, where 3D images were generated of the bony and membranous labyrinths using data sets from computed tomography (CT) and magnetic resonance imaging (MRI), respectively. The anatomical structures were identified and labelled according to NominaAnatomicaVeterinaria (NAV). Our study revealed that CT and MRI are the optimal cross-sectional imaging modalities for investigating such tiny and often inaccessible inner ear structures. As high-quality scanners are not readily available to veterinarians, the CT and MRI images generated by this research were of lower quality; therefore, high-quality dissections were used to identify/support structures seen in these images. In conclusion, this study provides one of the first investigations that uses multislice CT scans and MRI to study the rabbit's inner ear and its correlation with the corresponding anatomical images. Both anatomical, CT and MRI images will serve as a reference for interpreting pathologies relative to the rabbit's inner ear.

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“…These findings are in agreement with that mentioned by Kneissl et al (2004), Couturier et al (2005), Wolf et al (2011) in dogs, Gonçalves et al (2015) in horse and Juliano (2018)…”

Section: Discussionsupporting

confidence: 93%

Section: Discussionsupporting

confidence: 93%

Anatomy of the rabbit inner ear using computed tomography and magnetic resonance imaging

El-Hameed

El-Shafey

Metwally

et al. 2023

Anat Histol Embryol

View full text Add to dashboard Cite

show abstract

“…This is similar to previously documented poor success of CSF culture 1,3 with false-negative results in approximately 70% of cases. 13 Organisms that are typically implicated in veterinary cases with OM/OI include P. aeruginosa and Staphylococcus intermedius, as documented in our samples obtained from surgery, as well as Streptococcus, Proteus, Klebsiella and E. coli species. 3,11 The choice of antibiotic should be based on bacterial culture and sensitivity where possible.…”

Section: Discussionmentioning

confidence: 75%

“…While additional 3D MRI sequences such as constructive interference in steady state may aid in diagnosis and be of clinical use in humans when evaluating the middle/inner ear in greater detail, this is not typically performed in dogs and its use in evaluating the ear is isolated to a single experimental case series to date. 13 Collecting CSF in cases of OM/OI to screen for meningeal/intracranial involvement should be considered to aid in the diagnosis, particularly where MRI findings alone are less supportive. No dogs included in the study underwent concurrent CT at the time of presentation and, therefore, it was not possible to make direct comparisons between CT and MRI; however, this might be a future study area of interest.…”

Section: Discussionmentioning

confidence: 99%

Bacterial meningitis secondary to otogenic infection in 10 French bulldogs: A retrospective case series

Butterfield,

Whittaker,

Tabanez

et al. 2023

Veterinary Record Open

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Background There is limited published information to guide the clinical management of bacterial meningitis/encephalitis in dogs. Methods This was a retrospective case series comprising 10 French bulldogs from two referral centres. The cases were diagnosed with bacterial meningitis/encephalitis suspected secondary to otogenic infection based on detection of abnormal fluid/soft tissue opacity within the middle/inner ear, associated meningeal/intracranial involvement through MRI, the findings of cerebro‐spinal fluid (CSF) analysis suggestive of sepsis and/or clinical improvement following antibiosis. Results Ten dogs were included (three female and seven male), with a median age of 60 months. Dogs presented with acute onset (median 2 days), progressive history of vestibular signs and/or intra‐oral or cervical pain. Five dogs had gross signs of concurrent otitis externa. Common MRI findings included material within the tympanic bulla with adjacent meningeal enhancement. Analysis of CSF documented pleocytosis in all eight dogs, intracellular bacteria seen in three with positive bacteriological culture in two dogs. One dog was euthanised following diagnosis. Nine remaining dogs received antimicrobial therapy and six underwent surgical management. Three dogs treated surgically were neurologically normal within 2 weeks and the remaining three improved. Two dogs treated medically improved and one had complete resolution reported within a 4‐week follow‐up period. Study limitations include its retrospective nature and small sample size with minimal longer term follow‐up. Conclusions Bacterial meningitis/encephalitis in French bulldogs can require both medical and surgical treatment to achieve a favourable outcome.

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“…Magnetic resonance imaging (MRI) is an excellent imaging modality to obtain anatomical information about the ear and central auditory system in dogs [3,4]. However, conventional MRI does not provide any functional information about the auditory system.…”

Section: Introductionmentioning

confidence: 99%

Functional magnetic resonance imaging of the ascending stages of the auditory system in dogs

et al. 2013

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BackgroundFunctional magnetic resonance imaging (fMRI) is a technique able to localize neural activity in the brain by detecting associated changes in blood flow. It is an essential tool for studying human functional neuroanatomy including the auditory system. There are only a few studies, however, using fMRI to study canine brain functions. In the current study ten anesthetized dogs were scanned during auditory stimulation. Two functional sequences, each in combination with a suitable stimulation paradigm, were used in each subject. Sequence 1 provided periods of silence during which acoustic stimuli could be presented unmasked by scanner noise (sparse temporal sampling) whereas in sequence 2 the scanner noise was present throughout the entire session (continuous imaging). The results obtained with the two different functional sequences were compared.ResultsThis study shows that with the proper experimental setup it is possible to detect neural activity in the auditory system of dogs. In contrast to human fMRI studies the strongest activity was found in the subcortical parts of the auditory pathways. Especially sequence 1 showed a high reliability in detecting activated voxels in brain regions associated with the auditory system.ConclusionThese results indicate that fMRI is applicable for studying the canine auditory system and could become an additional method for the clinical evaluation of the auditory function of dogs. Additionally, fMRI is an interesting technique for future studies concerned with canine functional neuroanatomy.

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Optimising magnetic resonance image quality of the ear in healthy dogs

Cited by 5 publications

References 14 publications

Anatomy of the rabbit inner ear using computed tomography and magnetic resonance imaging

Anatomy of the rabbit inner ear using computed tomography and magnetic resonance imaging

Bacterial meningitis secondary to otogenic infection in 10 French bulldogs: A retrospective case series

Functional magnetic resonance imaging of the ascending stages of the auditory system in dogs

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