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RAD 107 exam 2

QuestionAnswer
What are the prime exposure factors? kVp = beam quality/penetration mAs = quantity of X-rays produced Filtration = removes low-energy photons Voltage ripple = affects beam quality/intensity
What does mAs control? Controls the number of X-ray photons Higher mAs = darker image + higher patient dose Lower mAs = lighter/noisier image
What does kVp control? Controls beam energy and penetration Higher kVp: More penetration, Lower contrast (more gray), Increased scatter Lower kVp: Less penetration, Higher contrast (black/white), Decreased scatter
What is the 15% Rule? Increasing kVp by 15% approximately doubles receptor exposure To maintain exposure: Increase kVp by 15% → cut mAs in half Decrease kVp by 15% → double mAs
What is beam penetrability? Ability of beam to pass through tissue Controlled mainly by kVp
What is beam intensity? Amount/strength of radiation produced Controlled mainly by mAs
What is foreshortening? Anatomy appears shorter Caused by incorrect body part or beam angle
What is elongation? Anatomy appears longer Caused by excessive beam angulation
What is the magnification formula? Increased OID = more magnification Longer SID = less magnification
What affects sharpness/spatial resolution? Focal spot size SID OID Motion Pixel size
How do you improve image sharpness? Small focal spot Long SID Short OID Prevent motion
What determines radiographic contrast? kVp Scatter radiation Collimation Patient thickness
What is CR? Uses imaging plates Slower processing More artifacts possible
What is DR? Direct digital detector Faster image display Higher efficiency
What are the main PACS components? Image acquisition Network Storage Workstations/display monitors
Created by: Aaliyah602
 

 



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