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Computed Tomography questions well answered already passed
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Computed TomographyThe word Tomo is tomography means - correct answer ✔✔To cut
What is the Z-axis - correct answer ✔✔the thickness of a cross-sectional slice.
The degree to which an x-ray beam is reduced by an object is referred to as - correct answer
✔✔Attenuation
The amount of the x-ray beam that is absorbed per unit thickness of the absorber - correct answer
✔✔Linear Attenuation
difference in linear attenuation coefficient is responsible for - correct answer ✔✔Image Contrast
These are the two dimensional squares of the matrix - correct answer ✔✔Pixels
The 3d dimension of the matrix are known as - correct answer ✔✔Voxels
Number of pixels in a matrix are product of number of - correct answer ✔✔Rows and columns
Beam attenuation of CT are measured in - correct answer ✔✔Hounsfield Units
Scan Data is the same as - correct answer ✔✔Raw Data
The ability of a system to define small objects distictly - correct answer ✔✔Spatial Resolution
This image quality's criteria refers to the speed at which the data can be acquired - correct answer
✔✔Temporal Resolution
,This image quality criteria is the ability to differentiate objects with similar densities - correct answer
✔✔Contrast Resolution
Multi slice is defined as _ to _ slices per gantry - correct answer ✔✔4 to 320
the time required to acquire all x-ray projections that are needed to reconstruct one CT image - correct
answer ✔✔Temporal resolution
2 advantages of volume scanning are - correct answer ✔✔shorter scan times
scanning more volume of anatomy
A single image reconstructed from a volume of acquired data. - correct answer ✔✔Slice
he group of slices which make up a particular examination - correct answer ✔✔Scan
Refers to a single exposure which results in an image much like a conventional x-ray - correct answer
✔✔Localizing Scan
determines how many detector cells collect data - correct answer ✔✔Scan field
determines what portion of the scan field of view is reconstructed - correct answer ✔✔field of view
This centre point is called - correct answer ✔✔display field of view centre
defined as the x and y distance from isocentre in cm - correct answer ✔✔display field of view centre
These mathematical algorithms help generate 2-D axial images from the spiral (3-D volumetric) data -
correct answer ✔✔interpolation algorithm
, If the image has fewer shades of grey, it presents with increased image contrast (more black and white)
and is expressed with a - correct answer ✔✔narrow window width
more shades of grey are expressed with - correct answer ✔✔wide window width
Ct provides us wih - correct answer ✔✔cross-sectional images of the body
CT numbers are also known as - correct answer ✔✔Hounsfield units
2 advantages of CT over X-ray - correct answer ✔✔Elimination of SI of structures
Improvement of contrast resolution
Ring-shaped part of CT scanner. Many of the components necessary to produce and detect x-rays are
housed within - correct answer ✔✔Gantry
electromechanical devices called___ to provide continuous electrical power and electronic
communication across a rotating surface - correct answer ✔✔Slip Rings
Collect attenuation x-ray beam information. - correct answer ✔✔Detector Array
2 Types of filters in CT - correct answer ✔✔Shaped and Bowtie
The process of moving the table by a specified measure is most commonly called - correct answer
✔✔Incrementation
Cell Detectors should be __ to improve spatial resolution - correct answer ✔✔Small
Greater quantum efficiency of detectors equals better - correct answer ✔✔Contrast resolution
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