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Ch 28 Physics

Ch 28 physics

QuestionAnswer
What are the 2 principle characteristics of medical imaging? spatial and contrast resolution
What is spatial resolution usually described as? the size of an object that can be viewed
What is spatial frequency expressed in? line pairs/millimeter
As the spatial frequency becomes ______, the object becomes smaller. larger
The liver, kidneys, and brain have a ______ spatial frequency. low
What limits the spatial resolution? also in CH 26 pixels
An imaging system with a _________ spatial frequency has better _______ ____________. higher, spatial resolution
When calculating the Spatial frequency, you have to double the spatial resolution and then divide by the reciporal. Pg 450! read pg 450!
The ability of an imaging system to render objects of different sizes onto an image is? modulation transfer function MTF
The ideal imaging system would have a MTF equal to ______. one
Objects with _______ spatial frequency are more difficult to image. higher
How many pixels are required to form a line pair? 2
A _______ _________ test tool is used to measure the blur of the increased spatial resolution. bar pattern
______ increases when 2 screens are used. MTF
What is contrast resolution? ability to distinguish many shades of gray from black and white
How many shades of gray can the human eye visualize? 30
The number of gray shades that an image can reproduce? dynamic range
What is the dynamic range in digital imaging identified by? bit capacity of each pixel
What modality has the highest dynamic range? mammo
What is contrast resolution limited by? noise or SNR
When using digital imaging, __________ is constant, so a higher ________ can be used to reduce patient dosage. contrast, kVp
What is the purpose of the Contrast Detail curve? shows when an objects contrast is high, small objects can be imaged; when it is low, large objects can be imaged
________ influences spaital resolution while ______ influences contrast resolution. MTF, SNR
In screen-film radiology, what controls the spatial resolution? focal spot size
In digital imaging, what controls the spatial resolution? pixel size
When should a film be repeated? never! Unless the entire body part is clipped
The possibility of x-ray interacting with the image receptor is termed? Also is related to the absorption coefficient and to the SF of the signal.... ppt Detective Quantum Efficiency
What does the term DQE stand for? Detective Quantum Efficiency
The _______ is the portion of the image forming x-ray that represents the anatomy. signal
____ limits contrast resolution. noise
Created by: radgirl37
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