Health And Medicine- The CT Registry Review Test
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The CT Registry Review Program is about a detailed discussion of every concept highlighted in the CT certification exam's content specifications. It is designed to help technologists prepare effectively for the CT exam and enable them to take and interpret CT scans of patients accurately. Are you looking to test your knowledge of this topic? Well, here is the perfect quiz you can attempt right now!
- 1.Partial volume averaging on the CT image may be decreased by:
- A.
Increasing matrix size
- B.
Decreasing matrix size
- C.
Increasing slice thickness
- D.
Decreasing slice thickness
- 2.The loss of anatomic information between contiguous sections due to inconsistent patient breathing is called:
- A.
Cupping artifact
- B.
Misregistration
- C.
Overshoot artifact
- D.
Out of field artifact
- 3.A CT image is formed in part by projecting back all of the attenuation values recorded during data acquisition onto a:
- A.
Pixel
- B.
Voxel
- C.
Matrix
- D.
Reformat
- 4.What is the dimension of each pixel in an image with 512 x 512mm matrix and a DFOV equaling 25.6?
- A.
0.5 mm
- B.
0.5 cm
- C.
0.05 cm
- D.
Both A and C
- 5.First generation CT scanners used a method of data acquisition based on a _______________ principle.
- A.
Multiplanar
- B.
Rotation only
- C.
Translate - rotate
- D.
Transaxial
- 6.CT numbers are usually provided in the form of:
- A.
Hounsfield units
- B.
Electromagnetic interference numbers
- C.
Cormacks
- D.
U
- 7.Which of the following may be used for the archival storage of CT images?1. magnetic tape2. VHS tape3. magnetic optical disk
- A.
1 only
- B.
1 and 3
- C.
2 and 3
- D.
1,2, and 3
- 8.The reduction in intensity of an x-ray beam as it interacts with matter is termed:
- A.
Scatter
- B.
Attenuation
- C.
Transmission
- D.
Luminescence
- 9.The major disadvantage of the fan shaped x-ray beams used in modern CT units when compared with "pencil thin" beams is:
- A.
Increased transmission measurements
- B.
Increased patient dose
- C.
Decreased transmission measurements
- D.
Excess tube wear
- 10.Which of the following is the most common type of noise found in the CT image?
- A.
Statistical noise
- B.
Electronic noise
- C.
Artifactual noise
- D.
Filter noise
- 11.Scintillation crystals are used exclusively as detectors in __________________ CT scanners?
- A.
Electron beam
- B.
Third-generation
- C.
Fourth generation
- D.
Spiral
- 12.A first generation CT Scanner consists of an x-ray tube and two detectors that translate across the patients's head while rotating in 1 degree increments for a total of:
- A.
45 degrees
- B.
90 degrees
- C.
180 degrees
- D.
360 degrees
- 13.Which of the following factors doesn not affect the dimensions of a voxel?
- A.
Slice thickness
- B.
Matrix size
- C.
Kernel
- D.
DFOV
- 14.Areas of a CT image that contain abrupt changes in tissue density are electronically represented by which of the following?
- A.
Positive CT numbers
- B.
High spatial frequencies
- C.
Negative CT numbers
- D.
Low spatial frequencies
- 15.Which of the following is an analytic form of image reconstruction?1. iterative technique2. Fourier reconstruction3. filtered back-projection
- A.
1 only
- B.
1 and 2 only
- C.
2 and 3 only
- D.
1, 2, and 3
- 16.Which of the following archival media is capable of storing the largest number of CT images?
- A.
Floppy disk
- B.
Magnetic tape
- C.
VHS tape
- D.
Optical disk
- 17.The term used to describe the relation between the linear attenuation coefficients of an object and the calculated CT numbers is:
- A.
Linearity
- B.
Mottle
- C.
Quantum noise
- D.
Spatial resolution
- 18.The component of the CT scanner responsible for the mathematical calculations of the image reconstruction is the:
- A.
Data acquisition system (DAS)
- B.
Analog-to-analog converter
- C.
Digital-to-analog converter
- D.
Array Processor
- 19.Which of the following statements regarding retrospective image reconstruction is false?
- A.
The algorithm, matrix size, and DFOV may all be changed.
- B.
The slice thickness and SFOV may be changed
- C.
Scan (raw) data must be available
- D.
Retrospective image reconstuction may be used to adjust the center of the displayed image.
- 20.Which of the following decreases the noise of the CT image?
- A.
Decrease in dose
- B.
Decrease in lice thickness
- C.
Increase in matrix size
- D.
Decrease in matrix size
- 21.Increasing the pitch during a spiral CT examination adversely affects the spatial resolution along with which of the following?
- A.
Axial plane
- B.
X axis
- C.
Y axis
- D.
Z axis
- 22.Which of the following statements regarding prepatient collimation is true?1. An increase in prepatient collimation increases Pt dose.2. Prepatient collimation is used to focus radiation through the section of interest.3. Prepatient collimation directly controls slice thickness.
- A.
2 only
- B.
3 only
- C.
1 and 2 only
- D.
2 and 3 only
- 23.When an operator reduces the SFOV for a particular body part, which of the following technical changes occurs?
- A.
The displayed image appears larger
- B.
Spatial resolution increases
- C.
A smaller number of detectors are activated.
- D.
The displayed image appears smaller.
- 24.An average CT number value for blood is:
- A.
-20 Hounsfield units
- B.
+10 Hounsfield units
- C.
+45 Hounsfield units
- D.
+100 Hounsfield units
- 25.Which of the following types of gas is commonly used for gas ionization CT detectors?
- A.
Xenon
- B.
Cadmium tungstate
- C.
Helium
- D.
Nitrogen
Questions: 85 | Attempts: 16415 | Last updated: Jan 14, 2021
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