The main advantages of CT over conventional radiography are correct answers -Elimination of superimposed structures
- the ability to differentiate small differences in density of an atomic structures
- superior quality of the images
Computer tomography for technologists exam review Romans chapte...
the main advantages of ct over conventional radiog
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ARRT CT REGISTRY PHYSICS
ARRT CT REGISTRY PHYSICS
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The main advantages of CT over conventional radiography are correct answers -Elimination
of superimposed structures
- the ability to differentiate small differences in density of an atomic structures
- superior quality of the images
Computer tomography for technologists exam review Romans chapter 1 page 3
CT image quality is evaluated using a number of criteria including correct answers - spatial
resolution
- low contrast resolution
- temporal resolution
The CT process creates what type of images with information collected when an x-ray beam
passes through an area of anatomy correct answers Cross-sectional images
These elements can consist of two dimensional squares in which the width is indicated by X
and the height is indicated by Y.... what is the name of the term correct answers Pixel
The Xray photons pass through or are absorbed or scattered by structures and varying
amounts depending on correct answers - average photon energy of the x-ray beam
- characteristic of the structure in its path
Objects that have little ability to attenuate the beam are said to have what type of attenuation
correct answers Low attenuation
Computer tomography for technologists exam review Romans chapter 1 page 3
Objects that have the ability to absorb much, or all, of the beam said to have what type of
attenuation correct answers High attenuation
Computer tomography for technologists exam review Romans chapter 1 page 3
Lower attenuation structures are represented by what color correct answers Black or dark
grey area on the image
The number of photons that interact with an object depends on correct answers - thickness
- density
- atomic number of the object
Computer tomography for technologists exam review Romans chapter 1 page 3
The amount of Xray beam that is scattered or absorbed per unit thickness of the absorber is
expressed by the term correct answers Linear coefficient
To differentiate an object on a CT image from adjacent objects there must be correct answers
There must be sufficient density differences between the two objects
The administration of what is often used to create a temporary artificial density difference
between objects correct answers Oral or intravenous administration of a contrast agent
________ agents flll certain structures with a higher density material, subsequently raising
the structures ability to attenuate that Xray beam. correct answers Oral or intravenous
iodinated
An -HU-hounsfield derived from a ______ can be useful in some instances, particularly when
a quick check of a density is needed correct answers single pixel
There are more than ______ Hounsfield unit while the monitor can only display _______
shades of gray. Furthermore the human eye can different shade only a fraction of those
shades correct answers -2000 Hounsfield unit
-256 shades of gray
the _______ of an object can provide valuable diagnostic information. correct answers
Hounsfield measurement
Computer tomography for technologists exam review Romans chapter 1 page 15
Because measurement may be negatively affected by ________, caution should be used
when. HU values are used in the diagnosis of disease correct answers volume averaging for
image noise
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