Cat Scan Review
Question for Computed Tomography Registry
- 1.
What is an advantage of scans of the pituitary taken in the coronal plane?
- A.
IV contrast material is better visualized
- B.
Streak artifacts are reduced or eliminated.
- C.
The patient is more comfortable during scanning.
- D.
The patient receives a lower radiation dose
Correct Answer
B. Streak artifacts are reduced or eliminated. -
- 2.
Which two strategies can reduce the effect of dental fillings in a sinus study?
- A.
High mA and shcrt scan time
- B.
Low kVp and high contrast, or bone alogrithm
- C.
Adjust the angle of the gantry and widen the window width
- D.
Small focal spot and small display field
Correct Answer
C. Adjust the angle of the gantry and widen the window width -
- 3.
Which of the following conditions may be visualized in a CT study of the brain?
- A.
Glioblastoma
- B.
Wilm's Tumor
- C.
Krukenberg Tumor
- D.
Plasmacytosis
Correct Answer
A. Glioblastoma -
- 4.
Which of the following is affected by teh slice spacing in a CT study?
- A.
Spatial Resolution
- B.
Quantum Mottle
- C.
Radiation Dose to the Patient
- D.
Signal-to-Noise Ration
Correct Answer
C. Radiation Dose to the Patient -
- 5.
What is the name of the pinecon-shaped structure of the brain the can often be seen as calcified in CT images?
- A.
Choroid Plexus
- B.
Pineal Gland
- C.
Caudate Nucleus
- D.
Middle cerebral Artery
Correct Answer
B. Pineal Gland -
- 6.
Third generation (rotate/rotate) scanners overcame which of the following limitations?
- A.
Detector singal drift sensitivity
- B.
Translation motion
- C.
Spurious signals from moving signal wires
- D.
Cost
Correct Answer
B. Translation motion -
- 7.
What helical or spiral computed tomography term is defined as the table increment in distance per mm per 360 degrees gantry rotation divided by the section thickness in mm?
- A.
Rotation
- B.
Spiral
- C.
Helix
- D.
Pitch
Correct Answer
D. Pitch -
- 8.
What determines the section thickness?
- A.
Scan arc
- B.
Filtration algorithm
- C.
Incident beam collimation
- D.
Detector alignment
Correct Answer
C. Incident beam collimation -
- 9.
What effect would an array processor failure have on image processing?
- A.
Increase image display time
- B.
Halt analog to digital conversions
- C.
Lengthens detector data acquisition time
- D.
Decrease xray tube output
Correct Answer
A. Increase image display time -
- 10.
What change will occur in the number of detected photons if a section thickness is changed from 5 mm to 10mm?
- A.
Decrease 50%
- B.
Decrease 25%
- C.
Increase 50%
- D.
Increase 100%
Correct Answer
D. Increase 100% -
- 11.
Which of the following will magnify the image?
- A.
Increase field of view
- B.
Decreasing field of view
- C.
Increasing section thickness
- D.
Decreasing section thickness
Correct Answer
B. Decreasing field of view -
- 12.
Which of the following is convolution?
- A.
Filtered back projection
- B.
Fourier transform
- C.
Iterative filtration
- D.
3-d rendering
Correct Answer
A. Filtered back projection -
- 13.
Which of the following determines the maximum number of shades of gray that can be displayed on the CT monitors?
- A.
Window level
- B.
Window width
- C.
Pixel size
- D.
Matrix size
Correct Answer
B. Window width -
- 14.
Which of the following are benefits of narrower section thicknesses?
- A.
Reduced partial volume averaging and improved spatial resolution
- B.
Decreased scan time, and more anatomy covered
Correct Answer
A. Reduced partial volume averaging and improved spatial resolution -
- 15.
Which of the following is the term used to describe a voxel value that is the average of multiple tissue types contained within the voxel?
- A.
Linear attenuation coefficient
- B.
Partial volume averaging
- C.
Low contrast resolution
- D.
Edge gradient averaging
Correct Answer
B. Partial volume averaging -
- 16.
Which of the following CT numbers would appear as a gray shades when a window width of 300 and a window level of 0 are selected?
- A.
Ct numbers above +300
- B.
Ct numbers between +150 and +300
- C.
Ct numbers between +150 and -150
- D.
Ct numbers below -150
Correct Answer
C. Ct numbers between +150 and -150 -
- 17.
Which fo the following is the central value in a range of gray shades used to display the image?
- A.
Window width
- B.
Window level
- C.
Region of interest
- D.
Dose index
Correct Answer
B. Window level -
- 18.
What is the most common type of film used to recore CT exams?
- A.
Single emulsion
- B.
Double emulsion
- C.
Triple emulsion
- D.
Rare earth
Correct Answer
A. Single emulsion -
- 19.
Which of the following increase signal to noise ration?
- A.
Increased mAs
- B.
Wider section thickness
- C.
Increased detection efficiency
Correct Answer(s)
A. Increased mAs
B. Wider section thickness
C. Increased detection efficiency -
- 20.
What is the appropriate compensation to avoid quantum noise when performing thin section computed tomography?
- A.
Increase mAs
- B.
Decrease field of view
- C.
Increase matrix size
- D.
Decrease scan speed
Correct Answer
A. Increase mAs -
- 21.
Which describes the relationship between section thickness and noise?
- A.
If section thickness increases, noise increases
- B.
If section thickness increases, noise decreases
- C.
If section thickness decreases, noise decreases
- D.
If section thickness decreases, noise remains unchanged
Correct Answer
B. If section thickness increases, noise decreases -
- 22.
What term is used to describe as the ability to display an image of a large object that is only slightly different in density from its surroundings?
- A.
Spatial resolution
- B.
Contrast resolution
- C.
Linearity
- D.
Clarity
Correct Answer
B. Contrast resolution -
- 23.
Which of the following should be viewed with relatively wide window widths?
- A.
Lung and inner ear
- B.
Lung and brain
- C.
Inner ear and brain
Correct Answer
A. Lung and inner ear -
- 24.
How often should an average CT number water calibration test be performed?
- A.
Daily
- B.
Monthly
- C.
Yearly
- D.
Weekly
Correct Answer
A. Daily -
- 25.
Which of the following accurately describes the relationship between patient dose and pitch?
- A.
If pitch increases, patient dose increases
- B.
If pitch increases, patient dose decreases
- C.
If pitch decreases, patient dose decreases
- D.
If pitch decreases, patient dose remains unchanged
Correct Answer
B. If pitch increases, patient dose decreases -
- 26.
Which of the following is defined as the ability to distinguish details in objects of different densities a small distance apart?
- A.
Contrast resolution
- B.
Cross field uniformity
- C.
Spatial resolution
- D.
Interpolation
Correct Answer
C. Spatial resolution -
- 27.
What is the term that is used to describe contrast resolution?
- A.
High spatial detectibilty
- B.
Low spatial detectibilty
- C.
High contrast detectibilty
- D.
Low contrast detectibilty
Correct Answer
D. Low contrast detectibilty -
- 28.
What is the primary type of interaction that contributes to the subject contrast in CT images?
- A.
Pair production
- B.
Photoelectric effect
- C.
Compton scattering
- D.
Linear attenuation
Correct Answer
C. Compton scattering -
- 29.
What type of scan geometry is responsible for producing ring artifacts?
- A.
Translate-rotate
- B.
Rotate-rotate
- C.
Rotate only
- D.
Helical / spiral
Correct Answer
B. Rotate-rotate -
- 30.
What is the cause for the "cupping" artifact?
- A.
The computer overcorrects for beam hardening
- B.
The beam encounters metal in the body
- C.
The body hardens the beam thus lowering the attenuation numbers in the center
- D.
The body hardens the beam thus increasing the attenuation numbers in the center
Correct Answer
C. The body hardens the beam thus lowering the attenuation numbers in the center -
- 31.
Which of the following can be described as bands and streaks that appear across an area due to bone and soft tissue attenuation values in the same pixel?
- A.
Tube arcing artifacts
- B.
Beam hardening artifacts
- C.
Partial volume artifacts
- D.
Full volume artifacts
Correct Answer
C. Partial volume artifacts -
- 32.
Which of the following is a streak artifact oriented tangentially to a flat surface having a high spatial frequency?
- A.
Low contrast artifact
- B.
Edge gradient artifact
- C.
Equipment induced artifact
- D.
Signal artifact
Correct Answer
B. Edge gradient artifact -
- 33.
What filter selection would provide the best detail for imaging of the internal auditory canals?
- A.
Smooth
- B.
Sharp
- C.
Standard
- D.
Soft
Correct Answer
B. Sharp -
- 34.
What anatomical structure forms a roof over the posterior cranial fossa and is shaped like a tent?
- A.
Tentorium cerebelli
- B.
Falx cerebri
- C.
Pontine cistern
- D.
Pia mater
Correct Answer
A. Tentorium cerebelli -
- 35.
What type of artifact generally appears as a dark horizontal line through the petrous ridges?
- A.
Ring artifact
- B.
Motion artifact
- C.
Beam hardening artifacts
- D.
Metallic artifacts
Correct Answer
C. Beam hardening artifacts -
- 36.
Which of following results from a fracture in the temporal region of the skull with associated tearing of the middle meningeal artery?
- A.
Subdural hematoma
- B.
Epidural hematoma
- C.
Arteriovenous malformation
- D.
Subarchnoid hematoma
Correct Answer
B. Epidural hematoma -
- 37.
What canal allows communication between the third and fourth ventricles of the brain?
- A.
Choroid plexus
- B.
Aqueduct of Sylvius
- C.
Foreman of Magnum
- D.
Corpus callosum
Correct Answer
B. Aqueduct of Sylvius -
- 38.
Where is contrast media introduced for a myelography exam of the spinal canal?
- A.
Subdural space
- B.
Epidural space
- C.
Subarachnoid space
- D.
Spinal cord
Correct Answer
C. Subarachnoid space -
- 39.
Which of the following would be visualized first when coronal images are obtained via multiplanar reformation from posterior to anterior?
- A.
Neck of the pancreas
- B.
Transverse colon
- C.
Stomach
- D.
Spleen
Correct Answer
D. Spleen -
- 40.
Which of the following anatomical structures would be visualized first when obtaining sagittal sections from right to left?
- A.
C-loop of the duodenum
- B.
Tail of the pancreas
- C.
Gallbladder
- D.
Right kidney
Correct Answer
C. Gallbladder -
- 41.
What type of drug is Demerol?
- A.
Analgesic
- B.
Antipyretic
- C.
Antianxiety agent
- D.
Local anesthetic
Correct Answer
A. Analgesic -
- 42.
Which of the following describes rapid, irregular, ineffective twitches of the ventricles?
- A.
Ventricular regurgitation
- B.
Ventricular palpitations
- C.
Ventricular arrythmia
- D.
Ventricular fibrillation
Correct Answer
D. Ventricular fibrillation -
- 43.
Which of the following is the more toxic cation that is incorporated into the organic ionic contrast media?
- A.
Sodium
- B.
Meglumine
- C.
Iodine
- D.
Calcium
Correct Answer
A. Sodium -
- 44.
What term is used to describe the computed tomography appearance of an intracerebral hemorrhage as a result of a higher CT number of the hemorrhage as compared to normal brain tissue?
- A.
Hyperdense
- B.
Isodense
- C.
Hypodense
- D.
Mass effect
Correct Answer
A. Hyperdense -
- 45.
Which of the following provides optimal liver lesion detection following the introduction of contras media?
- A.
Scanning prior to the equilibrium phase
- B.
Scanning during to the equilibrium phase
- C.
Scanning after to the equilibrium phase
Correct Answer
A. Scanning prior to the equilibrium phase -
- 46.
Which of the following is the recommended percentage of barium in a barium sulfate suspension utilized in abdominal computed tomography?
- A.
1-3%
- B.
10-20%
- C.
30%
- D.
50%
Correct Answer
A. 1-3% -
- 47.
Which of the following are used in scintillation CT detectors?
- A.
Gadolinium based ceramic
- B.
Bismuth germanate
- C.
Calcium fluoride
Correct Answer(s)
A. Gadolinium based ceramic
B. Bismuth germanate
C. Calcium fluoride -
- 48.
Which of the following will have an effect on image quality?
- A.
Spatial resolution
- B.
Contrast resolution
- C.
Noise
Correct Answer(s)
A. Spatial resolution
B. Contrast resolution
C. Noise -
- 49.
What are the primary advantages of narrower section thicknesses?
- A.
Improved spatial resolution
- B.
Reduced partial volume averaging
- C.
Higher contrast
Correct Answer(s)
A. Improved spatial resolution
B. Reduced partial volume averaging -
- 50.
Which of the following geometric factors will have an effect on spatial resolution?
- A.
Focal spot size
- B.
Detector aperture width
- C.
Noise
Correct Answer(s)
A. Focal spot size
B. Detector aperture width -
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Our quizzes are rigorously reviewed, monitored and continuously updated by our expert board to maintain accuracy, relevance, and timeliness.
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Current Version
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Mar 21, 2022Quiz Edited by
ProProfs Editorial Team -
Apr 25, 2012Quiz Created by
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