Why are isotropic voxels particularly important in images of the musculoskeletal system?
isotropic voxels enable MPR images to be created in any plane with the same spatial resolution as the original sections
Compared with a cerebral CTA, what parameter must be changed for a cerebral CTV?
Delay from the start of injection to the start of scanning is increased
For what study might data be acquired while the patient is lying prone on the CT table?
High-resolution chest CT
A focused appendiceal CT refers to a scan protocol that:
limits the scan area to the lower abdomen and upper pelvis
What is the expected HU value of a measurement taken in a lateral ventricle?
4 to 8
What explains the diversity in clinical presentation of acute appendicitis?
the variable position of the appendix
What percentage of urinary tract calculi will be seen on non contrast helical computed tomography?
99%
The phase of liver enhancement that occurs 60 to 70 seconds after an IV bolus injection is called the:
portal venous phase
Why do many protocols for the evaluation of PE scan in the caudal-to-cranial direction?
To reduce artifacts attributable to patient motion
A patient who is scheduled for a CT study has an irregular heartbeat with a rate of approximately 85 bpm. For which clinical indication is this the most problematic?
