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Quality of the radiographic image

Quality of the radiographic image. Contrast Image geometry Characteristics of the x-ray beam Image sharpness and resolution. Perception of the radiographic image. Partial images-we all see the same partial images but we don’t necessarily perceive the same object Contrast Context.

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Quality of the radiographic image

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  1. Quality of the radiographic image • Contrast • Image geometry • Characteristics of the x-ray beam • Image sharpness and resolution

  2. Perception of the radiographic image • Partial images-we all see the same partial images but we don’t necessarily perceive the same object • Contrast • Context

  3. Effect of partial image

  4. The effect of contrast

  5. The effect of context

  6. Image geometry • Positioning of the film, object and x-ray beam • Focal spot size and principle of line focus • Focal spot-object distance (FSOD), object- to film-distance (OFD)

  7. Ideal image geometry requirements

  8. Focal spot size, heat distribution and image sharpness • Focal spot 1mm • Heat needs to be distributed over as large as possible area • Principle of line focus

  9. Focal spot-to film-distance(FSFD)

  10. FSFD • Increasing the distance between the focal spot and the object results in an image with increased sharpness and less magnification of the object

  11. Object-to film- distance (OFD)

  12. Decreasing the distance between the object and the film increases the sharpness and result in less magnification of the object

  13. Image shape distortion

  14. Cont’d

  15. Bisecting angle technique-shape distortion

  16. Cont’d

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