Spatial resolution (CT)
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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 does the pixel size (assuming constant number of pixels), resulting in a decreased resolution
the smaller the pixel size the higher the spatial resolution
a larger focal spot will decrease the resolution
increasing will decrease the resolution
motion of the patient
is inversely related to the resolution, the higher the pitch the lower the resolution
edge enhancement kernels will have a higher spatial resolution than soft tissue kernels, at the cost of more noise and therefore decreased contrast resolution
the larger the slice thickness the lower the resolution
increase in detector element size decreases resolution