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