Highest resolution cat MRI anatomy is provided with 119 structures in three planes.
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The constituents of the visual, auditory and motor pathways are clearly visualized.
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Previously unresolvable cerebellar and vestibular nuclei are clearly identified.
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The detail is sufficient to illustrate cerebral vasculature.
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These findings are applicable to human diseases modeled in the cat.
Abstract
Background
Feline models of neurologic diseases, such as lysosomal storage diseases, leukodystrophies, Parkinson's disease, stroke and NeuroAIDS, accurately recreate many aspects of human disease allowing for comparative study of neuropathology and the testing of novel therapeutics. Here we describe in vivo visualization of fine structures within the feline brain that were previously only visible post mortem.
New method
3 Tesla MR images were acquired using T1-weighted (T1w) 3D magnetization-prepared rapid gradient echo (MPRAGE) sequence (0.4 mm isotropic resolution) and T2-weighted (T2w) turbo spin echo (TSE) images (0.3 mm × 0.3 mm × 1 mm resolution). Anatomic structures were identified based on feline and canine histology.
Results
T2w high resolution MR images with detailed structural identification are provided in transverse, sagittal and dorsal planes. T1w MR images are provided electronically in three dimensions for unrestricted spatial evaluation.
Comparison with existing methods
Many areas of the feline brain previously unresolvable on MRI are clearly visible in three orientations, including the dentate, interpositus and fastigial cerebellar nuclei, cranial nerves, lateral geniculate nucleus, optic radiation, cochlea, caudal colliculus, temporal lobe, precuneus, spinocerebellar tract, vestibular nuclei, reticular formation, pyramids and rostral and middle cerebral arteries. Additionally, the feline brain is represented in three dimensions for the first time.
Conclusions
These data establish normal appearance of detailed anatomical structures of the feline brain, which provide reference when evaluating neurologic disease or testing efficacy of novel therapeutics in animal models.
