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Computed Tomography An Overview CH 1 complete questions with correct answers.
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Computed Tomography An Overview CH1 complete questions with correct
answers.
ANS - "Image Reconstruction" comes from
using image reconstruction from projections ANS - CT overcomes limitations in "detail and clarity by
"inside" the patient (e.g., nuclear medicine) ANS - "emission CT", in which the radiation source is
outside the patient (e.g., x-ray imaging) ANS - "transmission CT", in which the radiation source is
image reconstruction ANS - "emission CT"/"transmission CT Both involve
-data acquisition
-image reconstruction
-image display ANS - The formation of CT images by a CT scanner involves three steps:
collection of x-ray transmission measurements from the patient ANS - The term "data acquisition"
refers to the
repeated over 180 degrees ANS - process of "translate-rotate-stop-rotate", referred to as scanning
volume scanning ANS - Acquiring a "volume of tissue" during the scanning is referred to as
spiral/helical path traced by the x-ray beam ANS - The continuous rotation of the "x-ray tube and
detectors" and the "simultaneous movement of the patient" result in a
-improve the volume of "coverage speed"
, -provide new tools for "clinical applications" ANS - The goal of "volume scanning" is to
enough "transmission measurements" have been collected by the "detectors" ANS - Image
Reconstruction occurs after
"sent" to the computer "for processing" ANS - after enough "transmission measurements" have been
collected by the "detectors", they are
via a process called "image reconstruction algorithms" ANS - How do computers "reconstruct a CT
image"
a finite number of steps a computer uses to "reconstruct a CT image" ANS - What is "image
reconstruction algorithms" ---
-Image Display
-Manipulation
-Storage, Recording, and Communications ANS - After the computer has performed "image
reconstruction" what functions can be performed;
cathode ray tube ANS - a "reconstructed image" is usually displayed on a
cathode ray tube ANS - Remains the best device for the display of "gray-scale imagery",
disk, tape, and card ANS - Optical storage media include at least three formats:
"electronic transmission of text data" and 'images" from the CT scanner to other devices such as ;;
laser printers; diagnostic workstations; display monitors in the radiology department, intensive care
unit, and operating and trauma rooms in the hospital; and computers outside the hospital ANS - In CT,
communications refers to the
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