What is CT MTF?
The modulation transfer function (MTF) is well known as a crucial parameter in quality assurance of computed tomography (CT) scanners, which provides detailed information of both contrast and resolution of CT images. Different methods have been introduced and developed to calculate the MTF of CT scanners.
What is the modulation transfer function used for?
The modulation transfer function (MTF) determines how much contrast in the original object is maintained by the detector. In other words, it characterizes how faithfully the spatial frequency content of the object gets transferred to the image.
What is an MTF and why you should care?
What is an MTF? and why you should care? Modulation Transfer Function (MTF) is the scientific means of evaluating the fundamental spatial resolution performance of an imaging system, or components of that system.
How is the Modulation Transfer Function ( MTF ) described?
By definition, the modulation transfer function (MTF) is described by the equation: This quantity, as discussed above, is an expression of the contrast alteration observed in the image of a sinusoidal object as a function of spatial frequency.
How is modulation transfer ratio related to spatial frequency?
Typical dependence of modulation transfer ratio on spatial frequency. The parameterized function is called the MTF. Since MTF characterizes how well the contrast in the object gets transferred to the image, it is inherently related to the various spread functions discussed earlier.
Which is the function of a modulation function?
In summary, MTF is the capacity of the detector to transfer the modulation of the input signal at a given spatial frequency to its output.
How is the modulation transfer function normalized to unity?
By convention, the modulation transfer function is normalized to unity at zero spatial frequency. Modulation is typically less in the image than in the specimen and there is often a slight phase displacement of the image relative to the specimen.
