Spatial resolution (CT)

Andrew Murphy et al.

Spatial resolution in CT is the ability to distinguish between object or structures that differ in density.

A high spatial resolution is important for one to discriminate between structures that are located within a small proximity to each other. 

Factors affecting CT spatial resolution

  • field of view 
    • as the FOV increases so do the pixel size; resulting in a decrease 
  • pixel size
    • the smaller the pixel size the higher the spatial resolution
  • focal spot size
    • a larger focal spot will decrease the resolution 
  • magnification 
    • increasing will decrease the resolution
  • motion of the patient 
  • pitch 
    • is inversely related to the resolution, the higher the pitch the less the resolution 
  • kernel  
    • edge enhancement kernels will have a higher resolution than soft tissue kernels 
  • slice thickness 
    • the larger the slice thickness the lower the resolution
  • detector size 
    • increase in detector size decreases resolution
Share article

Article information

rID: 59696
Section: Physics
Synonyms or Alternate Spellings:
  • CT spatial resolution

Support Radiopaedia and see fewer ads

Cases and figures

  • Drag
    Figure 1: CT window and algorithm effects
    Drag here to reorder.
  • Updating… Please wait.
    Loadinganimation

    Alert accept

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

    Alert accept Thank you for updating your details.