CT Exam 1 - Ch 1 & 2 Questions With Correct
Answers
Which is NOT a synonym for the preliminary/localizer image taken at the start of a CT examination?
A. Topogram
B. Scout
C. Scanogram
D. Spiral - VERIFIED ANSWER✔✔-D. Spiral
The ability of a system to differentiate, on the image, objects with similar densities is known as:
A. High contrast resolution
B. Low contrast resolution
C. Spatial resolution
D. Temporal resolution - VERIFIED ANSWER✔✔-B. Low contrast resolution
Each two dimensional square of data that make up the CT image is called a:
A. Pixel
B. Voxel
C. Matrix
D. Fragment - VERIFIED ANSWER✔✔-A. Pixel
How many pixels are contained in a 1,024 matrix image? A. 1,024
B. 2,048
C. 262,144
D. 1,048,576 - VERIFIED ANSWER✔✔-D. 1,048,576
Beam attenuation can be defined as:
A. The phenomenon by which artifacts result when lower energy photons are preferentially absorbed, leaving
only higher-intensity photons to strike the detector array.
B. Xray energy that is produced from bombarding a substance with fast moving electrons.
C. The ability of the detector to capture transmitted photons and change them to electronic signals.
D. The phenomenon by which an xray beam passing through a structure is decreased in intensity or amount
because of absorption and interaction with matter. - VERIFIED ANSWER✔✔-D. The phenomenon by which an
xray beam passing through a structure is decreased in intensity or amount because of absorption and interaction
with matter.
Which of the following is a low attenuation structure:
A. Iodine filled aorta
B. Rib
C. Trachea
D. Calcified arteries - VERIFIED ANSWER✔✔-C. Trachea
An object is slightly less dense than water. What is the expected hounsfield measurement?
A. -940
B. -10
C. 50
D. 850 - VERIFIED ANSWER✔✔-B. -10
Why does the administration of iodinated contrast media result in an enhanced image?
A. Iodinated contrast material increases the ability of the enhanced structure to attenuate the xray beam.
B. Iodinated contrast material decreases the average photon energy of the xray beam; therefore more photons are
absorbed by the patient.
C. The administration of contrast material results in a smaller pixel, thereby increasing spatial resolution, which
Answers
Which is NOT a synonym for the preliminary/localizer image taken at the start of a CT examination?
A. Topogram
B. Scout
C. Scanogram
D. Spiral - VERIFIED ANSWER✔✔-D. Spiral
The ability of a system to differentiate, on the image, objects with similar densities is known as:
A. High contrast resolution
B. Low contrast resolution
C. Spatial resolution
D. Temporal resolution - VERIFIED ANSWER✔✔-B. Low contrast resolution
Each two dimensional square of data that make up the CT image is called a:
A. Pixel
B. Voxel
C. Matrix
D. Fragment - VERIFIED ANSWER✔✔-A. Pixel
How many pixels are contained in a 1,024 matrix image? A. 1,024
B. 2,048
C. 262,144
D. 1,048,576 - VERIFIED ANSWER✔✔-D. 1,048,576
Beam attenuation can be defined as:
A. The phenomenon by which artifacts result when lower energy photons are preferentially absorbed, leaving
only higher-intensity photons to strike the detector array.
B. Xray energy that is produced from bombarding a substance with fast moving electrons.
C. The ability of the detector to capture transmitted photons and change them to electronic signals.
D. The phenomenon by which an xray beam passing through a structure is decreased in intensity or amount
because of absorption and interaction with matter. - VERIFIED ANSWER✔✔-D. The phenomenon by which an
xray beam passing through a structure is decreased in intensity or amount because of absorption and interaction
with matter.
Which of the following is a low attenuation structure:
A. Iodine filled aorta
B. Rib
C. Trachea
D. Calcified arteries - VERIFIED ANSWER✔✔-C. Trachea
An object is slightly less dense than water. What is the expected hounsfield measurement?
A. -940
B. -10
C. 50
D. 850 - VERIFIED ANSWER✔✔-B. -10
Why does the administration of iodinated contrast media result in an enhanced image?
A. Iodinated contrast material increases the ability of the enhanced structure to attenuate the xray beam.
B. Iodinated contrast material decreases the average photon energy of the xray beam; therefore more photons are
absorbed by the patient.
C. The administration of contrast material results in a smaller pixel, thereby increasing spatial resolution, which
