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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 chapte...

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SOLUTIONS!!
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

Computer tomography for technologists exam review Romans chapter 1 page 3

This type of resolution choice refers to acquisition speed correct answers Temporal resolution

Computer tomography for technologists exam review Romans chapter 1 page 3

What is the controlling factor of temporal resolution correct answers -gantry rotation speed
-reconstruction method

This term offers the ability to freeze motion and provide blur free images correct answers
Temporal resolution

https://coursewareobjects.elsevier.com/objects/elr/DeMaio/CT2e/computedtomography/
index.htm

Which of the following technical adjustments may be employed to improve temporal
resolution of an MDCT system correct answers decrease scan time

https://coursewareobjects.elsevier.com/objects/elr/DeMaio/CT2e/computedtomography/
index.htm

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


Computer tomography for technologists exam review Romans chapter 1 page 3

The CT slice represents a specific plane in the patient's body referred to as correct answers
The z-axis

Computer tomography for technologists exam review Romans chapter 1 page 3

What axis determines the thickness of the cross-sectional slice correct answers The z-axis

Computer tomography for technologists exam review Romans chapter 1 page 3

,The dimensions of a voxel can be calculated as a product of correct answers -pixel size
-section width

https://coursewareobjects.elsevier.com/objects/elr/DeMaio/CT2e/computedtomography/
index.htm

If the Z element or Z axis is taken into account the result is a cube referred to as a correct
answers Voxel

Computer tomography for technologists exam review Romans chapter 1 page 3

The voxels dimension may be decreased by which of the following? correct answers
Decreasing the selection width

Online exam Mosby

What term of a CT image controls the length of the voxel correct answers Section width

Online exam Mosby

The dimensions of a voxel may also be reduced through decreases in the ______ correct
answers -size of the pixels


Online exam Mosby

Data that form the CT slice are further section into correct answers Elements

Computer tomography for technologists exam review Romans chapter 1 page 3

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

Computer tomography for technologists exam review Romans chapter 1 page 3

What is the term that is a grid formed from rows and columns of pixels correct answers
Matrix

Computer tomography for technologists exam review Romans chapter 1 page 3

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


Computer tomography for technologists exam review Romans chapter 1 page 3

The degree in which an x-ray beam is reduced is referred to as correct answers Attenuation

,Computer tomography for technologists exam review Romans chapter 1 page 3

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

Computer tomography for technologists exam review Romans chapter 1 page 3

Higher attenuation structures are represented by what color correct answers White or light
gray area on the image

Computer tomography for technologists exam review Romans chapter 1 page 3

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


Computer tomography for technologists exam review Romans chapter 1 page 3

Differences and linear coefficient amount issues are responsible for correct answers x-ray
image contrast


Computer tomography for technologists exam review Romans chapter 1 page 3

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

Computer tomography for technologists exam review Romans chapter 1 page 3

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

Computer tomography for technologists exam review Romans chapter 1 page 3

________ 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

, Computer tomography for technologists exam review Romans chapter 1 page 149

It is important to note that the contrast agent does not change the body tissues but only
resides in them

True or false correct answers True


Computer tomography for technologists exam review Romans chapter 1 page 149

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



Computer tomography for technologists exam review Romans chapter 1 page 15

What hounsfield values are in the naturally occurring range and are not man made objects
like surgical clips? correct answers -1,000 to 1000



Computer tomography for technologists exam review Romans chapter 1 page 15

What is the term that is used to qualified the degree that the structure attenuates an Xray
beam correct answers Hounsfield unit

Computer tomography for technologists exam review Romans chapter 1 page 3

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




Computer tomography for technologists exam review Romans chapter 1 page 14

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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