Medical CT Registry Exam Review MCQ Test!
(25).jpg "Medical CT Registry Exam Review MCQ Test!")
The CT registry review test is intended for technologists who need an effective way to prepare and pass the CT certification exam. 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.
- 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 conditions may be visualized in a CT study of the brain?
- A.
Glioblastoma
- B.
Wilm's Tumor
- C.
Krukenberg Tumor
- D.
Plasmacytosis
- 4.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
- 5.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
- 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
- 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
- 8.What determines the section thickness?
- A.
Scan arc
- B.
Filtration algorithm
- C.
Incident beam collimation
- D.
Detector alignment
- 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.
- 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%
- 11.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.
- 12.Which of the following is convolution?
- A.
Filtered back projection
- B.
Fourier transform
- C.
Iterative filtration
- D.
3-d rendering
- 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
- 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
- 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.
- 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
- 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
- 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
- 19.Which of the following increase signal to noise ration?
- 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
- 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
- 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
- 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
- 24.How often should an average CT number water calibration test be performed?
- A.
Daily
- B.
Monthly
- C.
Yearly
- D.
Weekly
- 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
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