Computed Tomography (CT) Scan Quiz

154 Questions | By Radgirl86 | Updated: Mar 22, 2022 | Attempts: 633

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Computed Tomography (CT) Scan Quiz - Quiz

Computer tomography scans commonly known as CT scans make use of computer-processed combinations of many X-ray measurements taken at different angles. Take up the quiz below and gauge you knowledge on CT scans. All the best.

Questions and Answers

1.

Using _________ reconstruction filter would decrease the appearance of noise in a CT image.1. no2. a sharp3. a smooth
- A.
  
  1 only
- B.
  
  2 only
- C.
  
  2&3
- D.
  
  3 only
2.

A ___________ scan uses only a single projection.1. conventional, or serial2. helical3. localizer
- A.
  
  1 only
- B.
  
  2 only
- C.
  
  3 only
- D.
  
  1,2,&3
3.

Which of the following statements is FALSE regarding 3D SSD?
- A.
  
  Helical image data is well suited for 3D SSD because there is minimal misregistration or gaps.
- B.
  
  The volume data, from which the 3D SSD is generated, is created by combining transverse, sagittal, and coronal reconstructions
- C.
  
  The tissue surface may be selected by using a threshold value equal to the tissue's CT number.
- D.
  
  Patient motion during the scan is detrimental to the quality of the 3D images
4.

Which type(s) of storage media may hold CT image data?1. internal hard disk2. CD3. re-writable optical disk
- A.
  
  1 only
- B.
  
  2 only
- C.
  
  3 only
- D.
  
  1,2,& 3
5.

____________ may have to be edited from the data set to get a diagnostic MIP of a CTA exam.
- A.
  
  Iodinated contrast media
- B.
  
  Vessels of inetrest
- C.
  
  Air
- D.
  
  Bones
6.

Which of the following is NOT an advantage of a helical study compared to a conventional, serial CT study?
- A.
  
  Minimal anatomical mis-registration sometimes caused by inconsistent breath holding
- B.
  
  Shorter total exam time
- C.
  
  Can retrospectively reconstruct a slice at any arbitrary position
- D.
  
  Offers the best image quality for a brain exam
7.

Which of the following utilizes convolution?1. 3D SSD2. fourier transform3. filtered back projection
- A.
  
  1 only
- B.
  
  2 only
- C.
  
  3 only
- D.
  
  1, 2, & 3
8.

In which technique are tissues other than the surface of structure excluded by setting a threshold value and eliminating pixels above or below that threshold?
- A.
  
  Volume rendering
- B.
  
  Multi-planar reconstruction
- C.
  
  Maximum intensity projection
- D.
  
  3D shaded surface display
9.

From which of the following can the most diagnostic multi-planar reconstructions be generated?1. stacked transverse images from a helical scan2. stacked transverse images from a conventional, serial scan3. stacked localizer images
- A.
  
  1 only
- B.
  
  2 only
- C.
  
  3 only
- D.
  
  1, 2, & 3
10.

The actual attenuation data measured by the detectors from all projections during a scan is contained in CT ____________ data.1. image2. convolved3. raw
- A.
  
  1 only
- B.
  
  2 only
- C.
  
  3 only
- D.
  
  1, 2, & 3
11.

Which of the following is TRUE regarding the slice thickness of an image reconstructed from a helical scan?1. on a multi-row detector scanner, the thickness is equal to the beam collimation.2. on a single-row detector scanner, the thickness is equal to the beam collimation.3. on a single-row detector scanner, the thickness can be varied retrospectively.
- A.
  
  1 only
- B.
  
  2 only
- C.
  
  2 & 3
- D.
  
  1, 2, & 3
12.

A retrospective reconstruction, in which the reconstruction field-of-view is varied, uses:
- A.
  
  A reconstructed image in the sagittal plane
- B.
  
  CT raw data
- C.
  
  More photons
- D.
  
  CT image data
13.

Which of the following is common to both localizer scan and a conventional, serial CT scan?
- A.
  
  They both produce saggital images
- B.
  
  The patient table moves at a constant velocity
- C.
  
  They both produce cross-sectional images
- D.
  
  The x-ray tube makes complete 360 degree rotations
14.

Which of the following statements are TRUE?1. the amplified electrical signal obtained from the detectors must be digitized.2. digital CT images are numerical representations of cross-sectional anatomy.3. digital signals may be formed by sampling analog signals at discrete time intervals.
- A.
  
  1 only
- B.
  
  2 only
- C.
  
  3 only
- D.
  
  1, 2, & 3
15.

___________________ is the mathematical process used by single row detector scanners to reconstruct CT image from raw data.
- A.
  
  Weighted averaging
- B.
  
  Filtered back projection
- C.
  
  The fourier transform
- D.
  
  Integration of the area under the curve
16.

3D shaded surface displays are performed on CT:1. image data2. raw data3. attenuation profiles
- A.
  
  1 only
- B.
  
  2 only
- C.
  
  3 only
- D.
  
  1, 2, & 3
17.

A pixel is a :
- A.
  
  Bright artifact on a film
- B.
  
  Single 3D volume element within a volume of anatomical data
- C.
  
  Single 2D picture element within the image plane
- D.
  
  Range of gray levels on a CT image
18.

The pencil thin section of the x-ray fan beam that strikes a single detector is called a:
- A.
  
  Line
- B.
  
  Projection
- C.
  
  View
- D.
  
  Ray
19.

A kernel is a:
- A.
  
  Component in the x-ray tube
- B.
  
  Post-processing filter applied to image data
- C.
  
  Type of detector
- D.
  
  Filter applied to the CT raw data
20.

An increase in ___________ does NOT occur in the resulting images when applying a sharp, or high-pass reconstruction filter during the image reconstruction of CT raw data.1. contrast resolution2. edge enhancement3. the appearance of noise
- A.
  
  1 only
- B.
  
  2 only
- C.
  
  3 only
- D.
  
  1, 2, & 3
21.

CTA images come from a __________ scan.1. conventional, or serial2. helical3. localizer
- A.
  
  1 only
- B.
  
  2 only
- C.
  
  3 only
- D.
  
  1, 2, & 3
22.

If an image matrix has 360 rows and 360 columns, how many pixels are there in the image?
- A.
  
  21,600
- B.
  
  129,600
- C.
  
  259,200
- D.
  
  379,800
23.

The ______________ determines the intensity of the laser beam in a laser camera.1. intensifying grid2. pixel values in the image data3. mgnifying power of the lens
- A.
  
  1 only
- B.
  
  2 only
- C.
  
  3 only
- D.
  
  1, 2 & 3
24.

Which of the following is a reconstruction technique applied to the raw data after the primary reconstruction has already been accomplished?
- A.
  
  Maximum intensity projection
- B.
  
  Volume rendering
- C.
  
  Retrospective reconstruction
- D.
  
  Multi-planar reconstruction
25.

What does convolution do to the image quality when it is added to the back projection reconstruction process?
- A.
  
  Normalizes the attenuation coefficients to ensure tissues are displayed with correct CT numbers.
- B.
  
  Increases the number of projections thereby reducing streaking artifacts
- C.
  
  Improves contrast resolution by reducing scatter radiation
- D.
  
  Enhances important characteristics of attenuation profiles thus reducing streak and star artifacts