Neuroanatomy Basics Arcot Chandrasekhar M D Ashok Kumar
Neuroanatomy Basics Arcot Chandrasekhar, M. D. Ashok Kumar, M. D. November 5, 2013
MRI Titbits • MRI can provide axial, sagittal and coronal views. • MRI is best for tissue discrimination and is superior to CT. • Look at pre-contrast and post-contrast MRI as a pair. • T 2 wtd MRI: There are many MRI sequences used to visualize specific tissues. • Flair and diffusion wtd images are a few examples. • The best way to distinguish T 1 wtd MRI from T 2 wtd MRI is by the appearance of CSF is bright in T 2 wtd MRI and CSF is dark in T 1 wtd MRI.
Post-contrast sagittal T 1 wtd MRI
Post-contrast sagittal T 1 wtd MRI
Post-contrast sagittal T 1 wtd MRI
• For axial images you need to know the level. • The next set of images are axial sections of brain from top to bottom.
Pre-contrast axial T 1 wtd MRI
Pre-contrast axial T 1 wtd MRI
Pre-contrast axial T 1 wtd MRI
Pre-contrast axial T 1 wtd MRI
Pre-contrast axial T 1 wtd MRI
Spinal cord anatomy
Pre-contrast sagittal T 1 wtd MRI of cervical spine
Pre-contrast axial T 2 wtd MRI of cervical spine at C 5 -C 6 level
Pre-contrast axial T 1 wtd MRI of thoracic spine
Pre-contrast sagittal T 1 wtd MRI of cervical spine
Pre-contrast sagittal T 1 wtd MRI lumbar spine CSF dark in T 1 wtd image
Sagittal T 2 wtd MRI of lumbar spine CSF bright in T 2 wtd image
CT Titbits • CT provides axial views of the brain and spine. • Computer reconstructed process can provide sagittal view. • Pre-contrast CT is best for evaluation of bone and acute hemorrhage. • Bone and acute blood appear hyperdense. • Post-contrast CT enables visualization of vasculature and abnormal brain tissue. • Normal brain does not enhance with contrast. • CSF is hypodense and dark. • Vertebra are counted down from C 2 or up from S 1.
6 Pre Contrast CT Brain
Normal CT anatomy of cervical spine at the level of C 1 vertebral body
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