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CT REGISTRY- Exam Questions and Answers (STUDY THIS AND YOU'LL PASS!!
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CT REGISTRY- Exam Questions and Answers (STUDY THIS AND YOU'LL PASS!!
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CT REGISTRY- Exam Questions andAnswers (STUDY THIS AND YOU'LL PASS!!
how do you reduce beam hardening - Correct Answer ✅1.
Increase dose
2. Reduce collimation--Reduce slice thickness
3. Increase window width
At what level does the abdominal aortal bifurcate? - Correct
Answer ✅L4
What is the typical scan delay after injection of contrast
media for studies of the liver? - Correct Answer ✅30-45
seconds
What window settings provide the best tissue differentiation
within the liver? - Correct Answer ✅window width= 140,
level= 60
What is the window settings that provide the best bone
window for the pelvis? - Correct Answer ✅window
width=2000, window level=350
What mAs is typically used in routine CT exams of the
abdomen? - Correct Answer ✅200-300 mAs
What is the result of the bifurcation of the abdominal aorta? -
Correct Answer ✅The right and left common iliac arteries
,CT REGISTRY- Exam Questions and
Answers (STUDY THIS AND YOU'LL PASS!!
What is the anode target angle? - Correct Answer ✅12
degrees
At what level do the common carotids bifurcate into the
internal and external carotid arteries? - Correct Answer
✅C3-C4
The floor of the orbit is formed by the __________ bones. -
Correct Answer ✅maxillary and zygomatic
The lateral wall of the orbit is formed by the ___________
bones. - Correct Answer ✅zygomatic and sphenoid
The medial wall of the orbit is formed by the _________ bones.
- Correct Answer ✅ethmoid and lacrimal bones
how do you calculate effective mAs? - Correct Answer
✅mAs/pitch
define window level and window width - Correct Answer
✅LEVEL: a chosen midpoint in the grayscale
WIDTH: number of grayscale values above and below the
level.
,CT REGISTRY- Exam Questions and
Answers (STUDY THIS AND YOU'LL PASS!!
- The width is DIVIDED in HALF and distributed above and
below the level.
- Anything above the window is white
- Anything below the window is black
The wider the window the more grayscale values, the lower
the contrast!
example:
Level 100, Width 300
White = >+250
Black = <-50
Level 100, Width 200
White = >+200
Black = <0
Level 100, Width 150
White = >+175
Black = <25
factors that affect spatial and contrast resolution - Correct
Answer ✅Spatial resolution:
, CT REGISTRY- Exam Questions and
Answers (STUDY THIS AND YOU'LL PASS!!
1) focal spot
2) detector width (aperture)
3) reconstruction algorithm - bone>soft tissue
4) slice thickness - thinner is better
5) pixel/FOV/matrix
6) pitch - decreased pitch means no gaps
7) nyquist limitations
Contrast resolution: CNR
1) energy of X-rays - kVp - ↑ kVp ↓ contrast
2) number of X-rays - mA - ↑ mA ↓ mottle
3) slice thickness - thicker is better
4) reconstruction method - iterative > filtered
5) reconstruction algorthith - soft tissue>bone
Give window levels for brain, lung, abdomen, bone - Correct
Answer ✅Brain: W80,L+40
Lung: W1500, L-400
Abdomen: W400, L+50
Bone: W1600, L+500
What is beam hardening?
what are the two types of beam hardening artifact?
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