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Image production ct boards questions with 100% correct answers rated A+
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Image production ct boardsWhich of the following best describes the shape of the x-ray beam utilized in multidetector CT (MDCT)? -
correct answer ✔✔cone-shaped
Collimation of the CT x-ray beam occurs: 1. at the x-ray tube, regulating slice thickness 2. just beyond the
patient, focusing off-axis transmitted radiation 3. before the detectors, limiting the amount of scatter
radiation absorbed only - correct answer ✔✔1 and 3 only
CT numbers are usually provided in the form of: - correct answer ✔✔Hounsfield units
The mathematical technique allowing the reconstruction of motion-free images from helically acquired
CT data is called: - correct answer ✔✔interpolation
The full width at half maximum (FWHM) of a CT scanner is used to describe: - correct answer ✔✔spatial
resolution
A first-generation CT scanner consists of an x-ray tube and two detectors that translate across the
patient's head while rotating in 1-degree increments for a total of - correct answer ✔✔180 degrees
Which of the following abbreviations is used to identify a computerized network that stores, retrieves,
communicates, and displays digital medical images? - correct answer ✔✔PACS
The CT "window" controls the ______of the CT image as it appears detail to the viewer. - correct answer
✔✔contrast and brightness
Voxels with equal dimensions along the x-, y, and z-axes are referred to as: - correct answer ✔✔isotropic
Which of the following artifacts is not affected by the CT technologist? - correct answer ✔✔ring
, When one is viewing a multiplanar reformation (MPR) image, each pixel represents: - correct answer
✔✔the average attenuation occurring within the voxel
Statistical noise appears as ______ on a CT image. - correct answer ✔✔graininess
An acquisition is made on a 64-slice multidetector CT (MDCT) system in which each detector element has
a z-axis dimension of 0.625 mm. With a selected beam width of 40 mm and the beam pitch set at 1.50,
how much will the table move with each rotation of the gantry? - correct answer ✔✔60 mm
The component of the CT computer system responsible for the data processing of image reconstruction
is the: - correct answer ✔✔array processor
The loss of anatomic information between contiguous sections due to inconsistent patient breathing is
called: - correct answer ✔✔misregistration
Before a CT image can be reconstructed by a computer, the transmission signal produced by the
detectors must be converted into numerical informaton by a(n): - correct answer ✔✔analog-to-digital
converter (ADC)
A CT image is formed in part by projecting back all of the attenuation values recorded during data
acquisition onto a: - correct answer ✔✔matrix
Areas of a CT image that contain abrupt changes in tissue density are electronically represented by which
of the following?
positive CT numbers, high spatial frequencies, negative CT numbers, or low spatial frequencies - correct
answer ✔✔high spatial frequencies
Which of the following terms is used to describe a set of rules for solving a mathematical problem? -
correct answer ✔✔algorithm
Which of the following factors does not affect the dimensions of a voxel? - correct answer ✔✔kernel
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