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Diffusion MRI monitoring of specific structures in the irradiated rat brain
- Source :
- Magnetic Resonance in Medicine. 80:1614-1625
- Publication Year :
- 2018
- Publisher :
- Wiley, 2018.
-
Abstract
- Purpose The analysis of biological and mesoscopic structures properties by diffusion MRI (dMRI) in brain after radiation therapy remains challenging. In our study, we described the consequences associated with an unwanted dose to healthy tissue, assessing radiation-induced brain alterations of living rats with dMRI compared to histopathology and behavioral assays. Methods The right primary motor cortex M1 of the rat brain was targeted by stereotactic radiosurgery with a mean radiation dose of 41 Gy. Multidirectional single b-value dMRI data of the whole brain were acquired with a 7T small-animal scanner before irradiation until 110 days post-irradiation. Diffusion tensor imaging metrics, such as fractional anisotropy (FA), mean diffusivity (MD), axial (AD), and radial diffusivity (RD) were compared to brain alterations detected by immunohistochemistry and motor performances measured by a behavioral test. Results Between days 90 and 110, radiation necrosis was observed into the white matter spreading into M1 . Results showed a reduction of FA in the corpus callosum and in the striatum, which was driven by an increase in RD from 90 to 110 days post-irradiation, whereas only RD increased in M1 . Values of RD and AD increased in the irradiated hippocampus, while FA remained constant. Moreover, an increased MD, AD and RD was observed in the hippocampus that was probably related to inflammation as well as reactive astrogliosis after 110 days post-irradiation. Finally, rats did not exhibit locomotor deficits. Conclusions dMRI metrics can assess brain damage; the sensitivity of dMRI metrics depends on the brain region.
- Subjects :
- Male
Pathology
medicine.medical_specialty
medicine.medical_treatment
Hippocampus
Brain damage
Corpus callosum
Radiosurgery
White matter
03 medical and health sciences
0302 clinical medicine
Fractional anisotropy
medicine
Animals
Radiology, Nuclear Medicine and imaging
Radiation Injuries
Brain Chemistry
Behavior, Animal
Histocytochemistry
business.industry
Brain
medicine.disease
Rats, Inbred F344
Rats
Astrogliosis
Diffusion Magnetic Resonance Imaging
medicine.anatomical_structure
030220 oncology & carcinogenesis
medicine.symptom
business
030217 neurology & neurosurgery
Diffusion MRI
Subjects
Details
- ISSN :
- 07403194
- Volume :
- 80
- Database :
- OpenAIRE
- Journal :
- Magnetic Resonance in Medicine
- Accession number :
- edsair.doi.dedup.....108d57c652fffa405b3636e9f9d2b99c