Файл: Normal Findings in CT and MRI.pdf

artery

the aortic arch while the right artery arises with

the subclavian artery from the brachiocephalic

!

trunk)

Symmetry

!

Course

!

Caliber (symmetry)

!

Signal characteristics

!

No excessive tortuosity

Carotid

!

No circumscribed dilatation

!

Usually occurs at C4/5 or C3/4 level

bifurcation

!

Shape

! No circumscribed narrowing, especially at the

origin of the internal carotid artery

Internal carotid ! Position (no displacement)

artery

!

Course

! Caliber (slight proximal dilatation due to the

carotid sinus, right−left symmetry)

! Signal characteristics (homogeneous intralumi-

nal signal, no filling defect)

! Contours (smooth, no circumscribed constric-

tion or ulceration)

! No circumscribed narrowing (especially in the

proximal segment) with poststenotic dilatation

External carotid

! Symmetrical appearance of the carotid siphons

!

Position

artery

!

Course

!

Caliber

Vertebral artery

!

Signal characteristics

! Origin (from the subclavian artery or, rarely,

!

from the aortic arch)

Position

! Course (no excessive tortuosity)

! Caliber (no general or circumscribed luminal di-

latation)

! Caliber discrepancy (usually left > right) is com-

mon

! Signal characteristics (homogeneous intralumi-

!

nal signal, no filling defect)

Contours (smooth)

238

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