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Significance of scatter radiation

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Bikash Subedi

This document discusses scatter radiation in x-rays. Scatter radiation is radiation that is deflected from its original path during an x-ray, reducing image contrast. It is produced via interactions between x-ray photons and matter, including Compton scattering and coherent scattering. While scatter radiation carries no useful information for forming an image, it is important because it determines contrast resolution and is considered unwanted radiation due to safety and contrast reduction effects. However, its impact on image unsharpness is considered negligible in practical radiographs.

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Significance of scatter radiation
SIGNIFICANCE OF SCATTER RADIATION
INTRODUCTION When photon beam interacts with matter some of its part get absorbed , some get deflected to a new direction and rest of its part is transmitted to produce radio graphic image . The part which is deflected from its original path to a new direction is simply know as scatter radiation .
DEFINATION The secondary radiation which makes no favorable contribution to formation of image and produces an over all blackness on flim thus reducing overall radiographic contrast Source of scatter radiation Effects of scatter radiation Characteristics of scatter radiation
Production Of Scatter Radiation THERE ARE FIVE BASIC WAYS THAT AN X-ray PHOTON CAN INTERACTS WITH MATTER PHOTOELECTRIC PAIR PRODUCTION PHOTO DISINTEGRATION SCATTERING INCLUDES COHERENT & COMPTON
Significance of scatter radiation
IMPORTANCE OF SCATTER RADIATION Contrast resolution is determined by scatter radiation Text book on radiography consider the scatter radiation as unwanted due to radiation safety issues & effects of contrast reduction while carrying no information Additional it is stated that in practical image unsharpness is given by inherent & geometrical unsharpness only due to effects of scatter radiation is negligible .
If you could image a long bone in cross section area using only transmitted X-RAY the image will be very sharp the change in od from dark to light corresponding to the bone-soft tissue interface , would be very abrupt therefore image contrast will be high On other hand if radiograph were taken with only scatter radiation & no transmitted X-RAYS the radio graphics contrast will be very low Generally , image forming x-rays contains both transmitted and scatter X- RAY the image would have moderate contrast
Significance of scatter radiation
Significance of scatter radiation
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Significance of scatter radiation

  • 3. INTRODUCTION When photon beam interacts with matter some of its part get absorbed , some get deflected to a new direction and rest of its part is transmitted to produce radio graphic image . The part which is deflected from its original path to a new direction is simply know as scatter radiation .
  • 4. DEFINATION The secondary radiation which makes no favorable contribution to formation of image and produces an over all blackness on flim thus reducing overall radiographic contrast Source of scatter radiation Effects of scatter radiation Characteristics of scatter radiation
  • 5. Production Of Scatter Radiation THERE ARE FIVE BASIC WAYS THAT AN X-ray PHOTON CAN INTERACTS WITH MATTER PHOTOELECTRIC PAIR PRODUCTION PHOTO DISINTEGRATION SCATTERING INCLUDES COHERENT & COMPTON
  • 7. IMPORTANCE OF SCATTER RADIATION Contrast resolution is determined by scatter radiation Text book on radiography consider the scatter radiation as unwanted due to radiation safety issues & effects of contrast reduction while carrying no information Additional it is stated that in practical image unsharpness is given by inherent & geometrical unsharpness only due to effects of scatter radiation is negligible .
  • 8. If you could image a long bone in cross section area using only transmitted X-RAY the image will be very sharp the change in od from dark to light corresponding to the bone-soft tissue interface , would be very abrupt therefore image contrast will be high On other hand if radiograph were taken with only scatter radiation & no transmitted X-RAYS the radio graphics contrast will be very low Generally , image forming x-rays contains both transmitted and scatter X- RAY the image would have moderate contrast