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CT Registry Anatomy Questions and Answers Graded A+
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Exam of 7 pages for the course CT Registry at CT Registry (CT Registry Anatomy)
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CT Registry AnatomyWhere is cerebrospinal fluid produced? - answerIn the choroid plexus which originates
in the ventricles of the brain.
Where would CSF expect to be seen? - answerChoroid plexus, ventricles, 4th ventricle,
subarachnoid space around the brain and spinal cord.
Where is the subdural space located? - answerBetween the Dura mater and the
arachnoid.
Should there be fluid in the subdural space? - answerNo
How does fluid appear on CT? - answerWhite/bright
How should images of the pituitary and sella turcica be obtained? - answercoronal
Images acquired or reconstructed with thin slices of about 1 to 2mm from the anterior
clinoid through the dorsum sella. IV contrast given to see pituitary which will enhance
while pituitary lesions will not.
Bony structure posterior to the spinal cord and transverse process? - answerSpinous
process
How can calcification be differentiated from metal on a CT scan? - answerBoth will have
very high CT #s and appear bright but metal would also have streak artifacts emanating
from the high signal intensity.
Pt positioning for CT of the Wrist? - answerProne with arm raised above the head
When is intrathecal contrast given? - answerMyelogram.
Why would IV contrast be given for a spine CT? - answerRule out mass, differentiate
herniated disc from scar tissue.
Cranial nerve IX? - answerGlossopharyngeal nerve
Cranial nerve X? - answerVagus Nerve
Cranial nerve XI? - answerAccessory Nerve
Cranial Nerve XII? - answerHypoglossal nerve.
, Cranial Nerve VII? - answerfacial Nerve
Cranial Nerve VIII? - answerVestibulocochler nerve.
Are cranial nerves seen in the region of the supratentorium? - answerNo
Which cranial nerves seen on a CT of the soft tissue neck study? - answerIX, X, XI, XII,
Which cranial nerves may be visualized on a CT study of the internal auditory canal
(IACs)? - answerVII and VIII
To create 3D shaded surface rendering what type of data is used? -
answerReconstructed data is used.
How should the maxillary sinuses appear on CT? - answerThey should be filled with air.
Since air has a low CT # it appears dark. If you see bright signal in the maxillary sinuses
indicates it is fluid filled which is abnormal.
To assess fluid levels in the sinuses how should the study be performed? - answerPt in
prone position-head first with the head hyperextended and resting on the chin with the
top of the gantry tilted backward approximately 20 degrees. Coronal slices obtained
from the dorsum sella to the anterior aspect of the frontal sinus.
Why are thinner slices obtained in the posterior fossa than in the supratentorium? -
answerTo improve the spatial resolution and reduce the streak artifact that commonly
occurs with axial images through the temporal bones and petrous ridges.
If slices of the lumbar spine are desired at the exact angle of specific disk spaces how
should they be obtained? - answerShould be acquired directly rather than from the
reconstructed helical data. A lateral localizer image is needed.
Is contrast usually given to rule out a herniated disc? - answerNo.
Are axial or transverse slices of the entire T-spine usually obtained? - answerNo usually
only a few specified discs are scanned.
Can sagittal and coronal images of the spine be directly collected from a CT scan? -
answerNo an adult can't be positioned in the CT scanner as to obtain these images
directly. Therefore the sagittal and coronals are reformatted from the axials.
What do normal mastoid air cells look like? - answerShould be very dark because they
are air filled. If they appear gray indicates they are inflamed.
If vessels in the neck appear enhanced or bright what does this indicate? -
answerContrast media was used.
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