Image intensifier

Alan Ho and Andrew Murphy et al.

Image intensifiers are utilized to convert low energy radiation into visible light images. Frequently the detector portion of an x-ray c-arm use in operating theaters, the image intensifier has a low scatter input portion comprised of low absorption substances such as titanium or aluminum 1,2.  


Cesium iodide activated with sodium (CsI:Na) is the most commonly used entrance phosphor, the light produced by the phosphor of entry is converted via a photocathode to electrons, these photoelectrons are then accelerated via a potential difference (photocathode to anode) toward the output. 

The output portion of the image intensifier is most often comprised of silver-activated zinc-cadmium sulphide, converting the photoelectrons into light. 
This process multiplies the number of photons resulting in an increase in brightness, a very useful tool in cases requiring long a duration of x-ray fluoroscopy 1

The biggest advantage of an image intensifiers in medical imaging is the synergy of high detector efficiency and high conversion efficiency to effectively utilize fluoroscopy while adhering to the radiation protection principle of dose optimization.

Physics and imaging technology: x-ray
Share article

Article information

rID: 52641
Section: Physics
Tag: refs
Synonyms or Alternate Spellings:

Support Radiopaedia and see fewer ads

Updating… Please wait.

 Unable to process the form. Check for errors and try again.

 Thank you for updating your details.