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Voorbeeld van de inhoud
IMAGE PRODUCTION IN CTThe fundamental principle of computed tomography (CT) may be summarized as follows: - correct
answer ✔✔an image of an object may be reconstructed on the basis of the attenuation that occurs as x-
radiation is transmitted through it
The general process of CT imaging may be divided into several steps - correct answer ✔✔a. Data
acquisition
b. Data reconstruction
c. Multidimensional image display
d. Image archival and communication
Data acquisition - correct answer ✔✔the measurement of the attenuation that occurs along each path
through the patient from x-ray tube detector
Data reconstruction - correct answer ✔✔the computerized processing of the transmission
measurements into the CT image.
Multidimensional image display - correct answer ✔✔display of the reconstructed grayscale image in
two-dimensional (2-D) and/or three-dimensional (3-D) format; a representation of the attenuation that
occurred across the scanned volume of tissue.
Image archival and communication - correct answer ✔✔display as well as storage, both short-term and
long-term (archival), of images on computer workstations
What is the most basic scan mode utilized by a CT system - correct answer ✔✔scout image acquisition
scout image acquisition is - correct answer ✔✔survey scan is a digital radiograph obtained by keeping
the x-ray tube and detector array in a fixed position while the patient bed is translated through the
gantry
, A scout image may be also be referred to as - correct answer ✔✔a scanogram or localizer
How can a scout image may be produced in the anteroposterior, posteroanterior, lateral, or oblique
projection - correct answer ✔✔through adjustments in the positions of the x-ray tube and detectors
Azimuth is - correct answer ✔✔refers to the angle of the tube and detectors in relationship to the
patient position during scout acquisition
The scout image, the initial images acquired during a CT examination, is used - correct answer ✔✔as a
localizer for the prescription of the subsequent cross-sectional CT acquisition(s)
The thickness of the reconstructed image was controlled by the extent to which - correct answer ✔✔the
beam was collimated
The CT system itself is generally composed of - correct answer ✔✔of a powerful computer and display
system, a patient bed, and the gantry components
What houses the majority of the mechanical components of the CT system operation - correct answer
✔✔CT gantry
What does the CT gantry house - correct answer ✔✔the majority of the mechanical components of the
CT system operation, including the generator, x-ray tube, assorted collimators, the data acquisition
system (DAS), slip rings, and the detectors.
The x-ray and detector components of a early CT system were originally limited by - correct answer
✔✔hardwired cables, which prevented continuous rotation within the gantry. At the end of each
rotation of the x-ray tube and/or detectors, the system would need to reverse course and travel in the
opposite direction because the cables were finite length.
What eliminates the need for cables by utilizing a system of contact brushes that supply electricity to
power the system and enable the passage of transmission data to computer system. - correct answer
✔✔Slip-ring technology
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