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Champa Ch 1


Principles of Radiographic ExpAnswer
Photopic Cones
Scotopic Rods
Photographic Properties Density, Contrast
Geometric Properties Detail, Distortion
Density Overall Blackness
Contrast Differences in adjacent densities
Detail Sharpness of lines
Distortion Misrepresentation of the true size or shape of the image as compared to the object
Low Contrast Many shades of grey
High Contrast Black and white
Day Vision Photopic
Night Vision Scotopic
Veil Glare Bright light floods the eye and reduces contrast perception
Mach Effect The eye percieves a boundary between differing densities
Pattern Recognition Comparing mental images of patterns to arrive at a diagnosis
Why two images at 90 * angles To achieve a three dimensional image
Recorded Detail What is on film
Visibility Detail What we can see
mAs Milliamp seconds-current times seconds
kVp Kilovolt peak-energy of x-ray
Screen turns x-ray into light
Grid absorbs x-rays and improves contrast
Filtration Absorbs low energy x-rays
Pathology Changes density of tissues
SID Source to Image Distance
High Density Too Dark
Low Density Too Light
Size Distortion Always Magnification
Motion Destroys detail
Communication to patient Best way to control motion
Created by: Ranapipins