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Ch. 28 Recorded Detail

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kkaitlyn96's version from 2017-04-28 00:18

Section 1

Question Answer
What are the photographic properties?density and contrast (visibility)
What are the geometric properties?recorded detail and distortion (sharpness)
what is the controlling factor of density?mAs
What is the controlling factor of contrast?kVp
What is recorded detail?degree of sharpness in an image
What is distortion?Misrepresentation of size or shape of anatomical part
Other words for recorded detail (4)sharpness, resolution, spatial frequency, contrast resolution
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Section 2

Question Answer
Spatial resolution Smallest object that can be detected in the image, how the imaging system displays objects
What is resolution measured in?lp/mm
Penumbraunsharpness
umbrasharpness
What is digital resolution determined by?pixel size, matrix size, and gray scale bit depth
What is gray scale bit depth?number of shades of gray in a pixel
What amount of resolution can the human eye see?5lp/mm
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Section 3

Question Answer
Point spread function (PSF) is also known as (2)Edge spread function or Line Spread function
What is point spread function?reaction of photons in the IR, they express the boundaries of the an image
What is spatial frequency?measures tissue attenuation (contrast differences)
When you increase spatial frequency is there small or large differences?large
When spatial frequency increases and lp/mm increases, can you image large or small objects?small
When spatial frequency decreases and lp/mm decreases, can you image large or small objects?large
What is Modulation transfer function (MTF)?measures the accuracy of an image as it compares to the original object on a scale of 0 to 1 (percentage of object contrast recorded)
What does an MTF of 1 mean?Image is perfect
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Section 4

Question Answer
What is image noise?Background info the IR receives (Image fog)
What is Quantum noise?insufficient amount of photons (increase mAs)
What is contrast resolution?how well you see two things next to eachother
What is the controlling factor of recorded detail?focal spot size
What does the focal spot size control and why?amount of resolution because it controls penumbra
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Section 5

Question Answer
What is the equation for penumbra?focal spot size x OID/ SOD
What is the best way to prevent motion?communication
What are the 4 factors that affect detail?Motion, OID, SID, and Focal spot size
What do you want for the best detail? (OID, SID, FSS)Low OID, High SID, and Small FSS
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Section 6

Question Answer
matrix and resolution have what relationship?direct
pixels and resolution have what relationship?indirect
Modulation transfer function and spatial frequency have what relationship?indirect
Noise and contrast resolution have what relationship?indirect
Focal spot size and detail have what relationship?indirect
Focal spot size and penumbra have what relationship?direct
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Section 7

Question Answer
SID and penumbra have what relationship?indirect
SID and detail have what relationship?direct
OID and penumbra have what relationship?direct
OID and detail have what relationship?indirect
SOD and penumbra have what relationship?indirect
SOD and detail have what relationship?direct
Patient thickness and detail have what relationship?indirect
Motion and detail have what relationship?indirect
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