Medical CT Registry Exam Review MCQ Test!
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Try this Medical CT registry exam review MCQ test that we've prepared below for you. This CT registry review test is designed for technologists who need to prepare and pass the CT certification exam. You must already know that computed tomography (CT) is an imaging procedure that uses special x-ray equipment to create detailed scans of areas inside the body. Test your understanding of this concept by taking the quiz below and acing that upcoming final exam!
- 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.
- 2.Which two strategies can reduce the effect of dental fillings in a sinus study?
- A.
High mA and short scan time.
- B.
Low kVp and high contrast, or bone algorithm.
- C.
Adjust the angle of the gantry and widen the window width.
- D.
Small focal spot and small display field.
- 3.Which of the following is affected by the slice spacing in a CT study?
- A.
Spatial Resolution
- B.
Quantum Mottle
- C.
Radiation Dose to the Patient
- D.
Signal-to-Noise Ration
- 4.What is the name of the pinecone-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
- 5.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
- 6.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
- 7.What determines the section thickness?
- A.
Scan arc
- B.
Filtration algorithm
- C.
Incident beam collimation
- D.
Detector alignment
- 8.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%
- 9.Which of the following will magnify the image?
- A.
Increase the field of view.
- B.
Decreasing field of view.
- C.
Increasing section thickness.
- D.
Decreasing section thickness.
- 10.Which of the following is convolution?
- A.
Filtered back projection
- B.
Fourier transform
- C.
Iterative filtration
- D.
3-d rendering
- 11.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
- 12.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
- 13.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.
- 14.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
- 15.Which of the following increase signal to noise ration?
- A.
Increased mAs
- B.
Wider section thickness
- C.
Increased detection efficiency
- 16.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
- 17.How often should an average CT number water calibration test be performed?
- A.
Daily
- B.
Monthly
- C.
Yearly
- D.
Weekly
- 18.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
- 19.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
- 20.What type of scan geometry is responsible for producing ring artifacts?
- A.
Translate-rotate
- B.
Rotate-rotate
- C.
Rotate only
- D.
Helical / spiral
- 21.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
- 22.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
- 23.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
- 24.What filter selection would provide the best detail for imaging of the internal auditory canals?
- A.
Smooth
- B.
Sharp
- C.
Standard
- D.
Soft
- 25.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
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