Rad Tech #2:test 2 Flashcards
(143 cards)
Same quality factors of recorded detail, distortion, receptor exposure (density) and contrast
Image analysis
1) Can be dangerous in radiology
2) Can aluminate preconceived ideas about image to overcome mis-perceptions
Image perception
Controlling image space :
What are some radiographers challenges with taking images?
1) positioning area of interest so image quality will be improved
2) start with mentally visualizing abject of interest floating within body
What makes image a good contrast, good sharpness and visibility?
1) The image must possess sharpness invisibility and have proper balance of factors for radiographic quality
2) Text can utilize a number of factors, formulas, and techniques that can be manipulated to get good image
Measurable geometric ( can be measured) property of radiographic quality its an objective in nature?
Sharpness
What are two factors of sharpness?
1) spatial resolution (new digital word)
2) distortion ( any time tube is angled)
Photographic property that is subjective in nature ( what you see)
Visibility
What are 2 factors of visibility?
1) receptor exposure (density)
2) contrast
What is the formation of structural lines of image sharpness of details an image is measured?
Spatial resolution
What are other names of special resolution can be called?
Definition (rare) Sharpness Recorded detail Detail Resolution
What is a misrepresentation of the size/type of image recorded?
Ex) take image, make it bigger/ smaller=distortion
Distortion
Which major radiographic properties records detail and distortion are inversely proportional?
(As property increases, the detail decreases)
Distortion
What is the amount of blackness on an image or dark And can tell how much radiation is on an image?
Receptor exposure ( density~only in film)
When an image is black what happened to the radiation?
The radiation hit the receptor with a lot of force
What happen with radiation when your image is white?
No radiation went through
What is the difference in density in an image?
Contrast
Which radiographic property has images that have different shades of black, gray or white?
Contrast
What was the name of Chad to determine whether it has good contrast?
1) Must have two shades
2) Must have the ability to distinguish adjacent structures from each other
What deals with images or number of structural lines recorded
Resolution
How many ways can you assess spatial resolution?
4
What is the unit of resolution?
1p/mm ( line pairs/millimeters)
What is dependent on metric size, pixel size, grayscale bit depth
(as metric size increases, pixel size decrease, spatial resolution increases = better image !!)
Spatial resolution
Which floor of assessing spatial resolution uses the trabecular pattern? (Lines you can see in pattern)
Clinical evaluation
What is a line in space, each approximately 0.1mm in size, anything greater that 0.2mm per line is intolerable?
Line pair