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Chapter 2

Chapter 2. Image Quality Radiation Protection . Radiographic Technique. ________________( kVp ) ________________ (mA) Exposure ________ (s). kVp. Determines the ___________ of the beam. Gives X-rays the ___________ power. mAs. Combination of ___________

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Chapter 2

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  1. Chapter 2 Image Quality Radiation Protection

  2. Radiographic Technique • ________________(kVp) • ________________ (mA) • Exposure ________ (s)

  3. kVp • Determines the ___________ of the beam. • Gives X-rays the ___________ power

  4. mAs • Combination of ___________ • Determines the _________ of the beam • More mAs ________ radiation

  5. Image Quality Factors • __________ • Contrast • __________ • Distortion

  6. Density • The amount of ___________on a radiograph • _______ – Primary controlling factor • High _________ • Overexposed (hot) • Low _________ • Underexposed

  7. Contrast • The _____________________on adjacent areas • _________– Primary controlling factor • High ___________ (Short-scale) • Black and White • ______ kVp • Low ___________ (Long-scale) • Many shades of Gray • _________ kVp

  8. Resolution • Recorded _____________ of structures • Detail • Various factors influence resolution • Focal spot size • ______ – Source to Image Distance • ______ – Object to Image Distance • Motion

  9. Distortion • Misrepresentation of ___________or shape • Magnification • Increased ______ or Decreased _______ • Shape ___________ • Tube or part angle • Motion

  10. Computed Radiography (CR) • Regular _____________ • IR is IP – ______________ • No film • Can be used multiple times • IP reader • Converts ___________ image to a digital image • Tech Workstation • Can manipulate the image

  11. Direct Digital Radiography (DR) • Regular ___________ • Digital Detector • _________ • Signal is _________ connected to the workstation • Workstation • Can manipulate the image • ______________ • Still a consideration

  12. ALARA • A – ____ • L - _____ • A - _____ • R - ________ • A - _________

  13. Exposure Index • Numeric value representing the __________ the IR received. • _________Number • __________ proportional to dose • __________ Index • _________proportion Pg. 49 For Examples

  14. Tech “Cardinal” Rules • ___________ • ___________ • ___________

  15. Collimation • ________ the radiation to the area of interest • Lead ___________reducing the light field • Reduces patient __________ • Increases ___________

  16. Shielding • Lead for the __________ • Blanket, Gown, Part Specific • Lead for ____________ • Gown, Gloves, Glasses, Part Specific

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