Abstract
Cerebellar MR imaging has several challenging aspects, due to the fine, repetitive layered structure of cortical folia with underlying axonal pathways. In this MR study, we imaged with high-angular resolution diffusion imaging (HARDI) abnormal cerebellar cortical structure (gray matter) and myelinated axonal pathways (white matter) of a mouse spontaneous mutation, Purkinje cell degeneration (pcd), in which almost all Purkinje neurons degenerate, mainly between postnatal days 20 and 35. Mouse brains at postnatal day 20 (P20) and at 8 months were scanned, and known or expected abnormalities, such as reduction of the white matter volume, disorganized pathways likely linked to parallel fibers, mossy fibers, and other fibers running from/to the cerebellar cortex were observed in mutant mice. Such abnormalities were detected at both an early and a fully advanced degeneration stage. These results suggest that our diffusion MR tractography is useful for early detection and tracking of neuropathology in the cerebellum.
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Acknowledgments
This work was supported by Boston Children’s Hospital and NIH (R01HD078561, R21HD069001, R03NS091587) (ET). The authors thank Guangping Dai for technical advice and Natalie Stewart for editorial assistance.
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All procedures were in accordance with NIH-approved institutional guidelines maintained by the Institutional Animal Care and Use Committee of Harvard Medical School and the University of Connecticut.
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Kanamaru, Y., Li, J., Stewart, N. et al. Cerebellar Pathways in Mouse Model of Purkinje Cell Degeneration Detected by High-Angular Resolution Diffusion Imaging Tractography. Cerebellum 16, 648–655 (2017). https://doi.org/10.1007/s12311-016-0842-5
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DOI: https://doi.org/10.1007/s12311-016-0842-5