5 Characteristics In Image Quality
The factors that influence picture quality;
- Characteristic X-rays
- Subject transmission
- Slice thickness
- pixel Size
- reconstruction algorithm
- display resolution
Parameters for measuring image quality
PSF : Point Spread Function
LSF : Line Spread Function
CTF : Contrast Transfer Function
MTF : Modulation Transfer Function
A measure of the ability to discriminate objects of varying density a small distance apart against a uniform bacground (Computed Tomography, Seeram, 2001 p.176)
Factors affecting the spatial resolution
- geometry :Are factors that are directly related to the acquisition of data such as focal spot, detectors, isosenter
- reconstruction Algorithm A factor related to the mathematical process backprojection and convolution.
The ability to show a small object with a variety of 2-3mm a very low density.
Compared to conventional radiography in CT contrast resolution better
Factors affecting Contrast Resolution.