To revisit the physiology of cerebrospinal fluid (CSF) formation and flow. To describe various artifacts related to CSF circulation encountered in MR evaluation of the spine. To differentiate them from true pathologies and to highlight their potential diagnostic utility.
Cerebrospinal fluid (CSF) is the colourless fluid which encases the neuraxis.It cushions the brain and spinal cord from injury andserves as an important medium for thetransport of nutrients and wastes.On an average,
the de novo volume of CSF measures 140 mL.
This is superimposed by an average daily production of 500 mL of CSF produced by specialized ependymal tissues known as the choroid plexus found within the ventricles (1,2). CSF is in a dynamic state of motion,
circulated from the lateral...
Findings and procedure details
Commonly encountered artifacts on MRI due to CSF circulation are as follows: I) GHOST ARTIFACTS Phase mismapping or ‘Ghosting’ isa most common artifact due to CSF circulation.
It is recognized by the replication ('ghosts') of the moving anatomy across the image in the direction of the phase encoding gradient (4). Cause : The time duration during the acquisition of adjacent points following the application of the phase encoding gradient (PEG) is long (equal to the repetition time used).
CSF flow artifacts are commonplace in clinical practice,
hencethorough knowledge of these artifacts is beneficial.
Though they aid in identifying few abnormalities,
they tend to be a source of misinterpretations,
especially among radiologists-in-training.
Vivek Pai Clinical Fellow,Department of Neuroradiology, National Neuroscience Institute,Singapore. Email: firstname.lastname@example.org Dr.Bela Purohit Consultant,Department of Neuroradiology, National Neuroscience Institute,
Singapore. Email: email@example.com
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