Source to image-receptor distance

In medical radiology, the source to image-receptor distance (SID) is a measurement of the distance between the radiation source (such as an X-ray generator or gamma ray–generating radiopharmaceutical) and the radiation detector[1] (such as a film, flat panel detector, or gamma camera).

The SID is roughly related to the source to object distance (SOD)[2] and the object to image-receptor distance (OID) by the equation SOD + OID = SID. The relative and absolute values of these measurements will affect various qualities of the radiographic image as well as the amount of radiation[3] to which the patient is exposed. For example, increasing the OID alone can improve image contrast by decreasing the amount of scattered radiation that reaches the receptor; however it will also result in image magnification if the SID is not also proportionally increased.[4]

See also

References

  1. ↑ http://medical-dictionary.thefreedictionary.com/source-to-image-receptor+distance
  2. ↑ http://medical-dictionary.thefreedictionary.com/source-object+distance
  3. ↑ Poletti, JL; McLean, D (Sep 2005). "The effect of source to image-receptor distance on effective dose for some common X-ray projections.". The British journal of radiology 78 (933): 810–5. doi:10.1259/bjr/74823655. PMID 16110102.
  4. ↑ Ritenour, Mary Alice Statkiewicz Sherer, Paula J. Visconti, E. Russell (2010). Radiation protection in medical radiography (6th ed.). Maryland Heights, MO: Mosby Elsevier. p. 255. ISBN 978-0-323-06611-2.
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