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ARRT CT_ Simulated Exam 1 Review.
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ARRT CT: Simulated Exam 1 ReviewA complete CT study of the orbits should include what? - ANS-2.5 mm x 2.5 mm axial
and coronal sections
- narrow sections (1-3 mm) are required in both the axial and coronal planes to properly
demonstrate the orbits
A first-generation CT scanner consists of an x-ray tube and two detectors that translate
across the patient's head while rotating in 1-degree increments for a total of how many
degrees? - ANS-180 degrees
A standard CT image reconstructed on a 512^2 matrix has a digital size of
approximately what? - ANS-0.5 MB
After initiation of rapid bolus administration of an iodinated contrast agent, the arterial
phase of hepatic contrast enhancement occurs at approximately how many seconds? -
ANS-25-35 seconds
An enterovesical fistula is an abnormal connection between the bowel and what
structure? - ANS-Bladder
Areas of a CT image that contain abrupt changes in tissue density are electronically
represented by what? - ANS-High spatial frequencies
Average range for activated PTT? - ANS-25-35 seconds
Because of its inherent iodine concentration, the thyroid gland appears what on a CT
image? - ANS-Hyperdense
Beginning 30 to 40 seconds after the initiation of contrast agent administration, what
phase demonstrates optimal enhancement of the renal cortex with maximum
differentiation of the cortex from the renal medulla? - ANS-Corticomedullary phase
Contrast resolution of a CT scanner depends on several factors: - ANS-- section width
- algorithm selection
- detector sensitivity
- noise
, During a CT examination of a female pelvis for a suspected malignancy, ascites may be
present in an area posterior to the uterus and ovaries known as what? - ANS-The
cul-de-sac
During CT examination of the larynx, the patient often instructed to phonate the letter
"E" in order to properly evaluate what structure? - ANS-Vocal cords
Example of non-ionic iso-osmolar contrast agent - ANS-Iodixanol (Visipaque)
Examples of ionic contrast media - ANS-- Iothalamate meglumine (Conray)
- diatrizoate sodium (Hypaque)
Examples of non-ionic contrast media - ANS-- iopamidol (Isovue)
- iohexol (omnipaque)
- iopromide (Ultravist)
- ioversol (Optiray)
Full width at half maximum (FWHM), is used to illustrate what of a CT scanner? -
ANS-Spatial resolution
General signs and symptoms that a patient is going into shock - ANS-- rapid breathing
- tachycardia
- hypotension
- weak pulse
- pallor
- cyanosis
- cold, clammy skin
Image noise is equal to what of pixel values within an ROI measurement of the image? -
ANS-Standard deviation
On an EKG of the complete cardiac cycle, at which portion of the R-R interval is the
heart muscle in diastole? - ANS-55%-75%
Peritoneal cavity contains what structures? - ANS-- stomach
- liver
- gallbladder
- spleen
- ovaries
- transverse colon
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