factors affecting image quality

• what is meant by SID


  source image distance
• what is meant by OID


  object image distance
• what is meant by SOD


  source image distance
• what is source image distance (SID)


  the distance from anode in x ray tube to the image receptor
• what is object image distance (OID)


  the distance from patient to image receptor
• what is source image distance (SID)

  the distance from x ray tube to the patient
• what adjustments would you make if it was not possible to have the object on the receptor 


  in order to reduce the magnification of the image SID needs to be increased
• explain the term image distortion in relation to an x ray image 


  • when the object is not parallel with the image receptor
  • the resultant image may be distorted as the aspects of the object closer to the receptor will appear larger than thsir further away
• why is it important to have the object as close to the receptor as possible 


  • when the OID is increased the x rays continue to diverge as they pass the object
  • objects further away from the image receptor will be magnified compared to those closer