CT REGISTRY IMAGING PROCEDURES-
HEAD QUESTIONS AND ANSWERS
WITH SOLUTIONS 2024
During CT of the head the gantry should be angled ___ - ANSWER 15 degrees
Why is a 15 degree angle of the gantry during a head CT necessary? - ANSWER Reduces orbital dose and
beam hardening
A CT scan of the head is starts from _____ to _____. Slice thickness of this portion of scan is____. -
ANSWER Base of skull to posterior fossa
Thins 2mm-5mm
The second portion of the head CT goes from _____ to _____ in a slice thickness of____. - ANSWER
Posterior fossa to vertex
5mm-10mm
The bone window for a head CT is: - ANSWER WL 400
WW 3000
Why are there thin slices selected for the first portion of a head CT? - ANSWER Thinner slices through
the petrous pyramids reduce beam hardening.
Trauma head CT should be scanned with or with out IV contrast. - ANSWER Trauma should not be given
contrast because enhancement of the brain tissue could hide subtle signs of hemorrhage.
Head CT indications for studies WITH IV contrast include: - ANSWER -arteriovenous malformation
-suspected neoplasm
-studies of the pituitary gland
Types of neoplasms found within the brain: - ANSWER -meningioma
, -schwannoma
-glioma (to include astrocytoma)
Studies of the Temporal bones or the internal auditory canal (IAC) should be scanned with these
perimeters:
Hint 4 - ANSWER -Thin slices (0.6-2mm)
-reconstructed axial and coronal images
-targeted small DFOV
-no contrast (unless suspected neoplasm or vascular abnormality)
CT scan of the orbits should be scanned according to this landmark. - ANSWER parallel to IOML
Studies of the Orbits should be scanned with these perimeters:
Hint 3 - ANSWER -Thin slices (1-3mm)
-reconstructed coronal and axial
-no contrast (unless suspected neoplasm, vascular abnormalities, inflammation, etc)
The bone window for orbits: - ANSWER bone WL 400 WW 3000
CT scan of sinuses and facial bones should be scanned according to this landmark: - ANSWER parallel to
IOML
Name the 4 sinuses: - ANSWER -maxillary
-ethmoid
-sphenoid
-frontal
Studies of the sinuses and facial bones should be scanned according to these perimeters:
Hint 4 - ANSWER -include all 4 sinuses
HEAD QUESTIONS AND ANSWERS
WITH SOLUTIONS 2024
During CT of the head the gantry should be angled ___ - ANSWER 15 degrees
Why is a 15 degree angle of the gantry during a head CT necessary? - ANSWER Reduces orbital dose and
beam hardening
A CT scan of the head is starts from _____ to _____. Slice thickness of this portion of scan is____. -
ANSWER Base of skull to posterior fossa
Thins 2mm-5mm
The second portion of the head CT goes from _____ to _____ in a slice thickness of____. - ANSWER
Posterior fossa to vertex
5mm-10mm
The bone window for a head CT is: - ANSWER WL 400
WW 3000
Why are there thin slices selected for the first portion of a head CT? - ANSWER Thinner slices through
the petrous pyramids reduce beam hardening.
Trauma head CT should be scanned with or with out IV contrast. - ANSWER Trauma should not be given
contrast because enhancement of the brain tissue could hide subtle signs of hemorrhage.
Head CT indications for studies WITH IV contrast include: - ANSWER -arteriovenous malformation
-suspected neoplasm
-studies of the pituitary gland
Types of neoplasms found within the brain: - ANSWER -meningioma
, -schwannoma
-glioma (to include astrocytoma)
Studies of the Temporal bones or the internal auditory canal (IAC) should be scanned with these
perimeters:
Hint 4 - ANSWER -Thin slices (0.6-2mm)
-reconstructed axial and coronal images
-targeted small DFOV
-no contrast (unless suspected neoplasm or vascular abnormality)
CT scan of the orbits should be scanned according to this landmark. - ANSWER parallel to IOML
Studies of the Orbits should be scanned with these perimeters:
Hint 3 - ANSWER -Thin slices (1-3mm)
-reconstructed coronal and axial
-no contrast (unless suspected neoplasm, vascular abnormalities, inflammation, etc)
The bone window for orbits: - ANSWER bone WL 400 WW 3000
CT scan of sinuses and facial bones should be scanned according to this landmark: - ANSWER parallel to
IOML
Name the 4 sinuses: - ANSWER -maxillary
-ethmoid
-sphenoid
-frontal
Studies of the sinuses and facial bones should be scanned according to these perimeters:
Hint 4 - ANSWER -include all 4 sinuses
