Home
Radiology Guides Anatomy Physio & Path Medicine Physics Contact
MODULATION TRANSFER FUNCTION (MTF)

Physics

MODULATION TRANSFER FUNCTION (MTF)

1. Object size is represented by spatial frequency.

2. The system will detect the frequency (f), and as long as the frequency does not exceed the Nyquist frequency (i.e. f < F N ), it will produce an image at that same frequency, albeit with reduced contrast.

3. Contrast is represented by the amplitude of a sine wave. Higher frequencies experience more blurring and reduced contrast.

4. The reduction in contrast transfer is the result of resolution losses in the imaging system due to modulation (change in amplitude).

5. MTF = the spatial resolution of an imaging system as a function of the spatial frequency of the input signal.

6. It is not possible in general to stimulate a detector system with individual, spatial sinusoidal signals. Rather, the LSF is used to determine the MTF in experimental settings.


Avatar
REFERENCES

1. Bushberg, J. T. (2012). The essential physics of medical imaging. Philadelphia: Wolters Kluwer Health/Lippincott Williams & Wilkins. Find it at Amazon
2. Heggie, J. C., Liddell, N. A., & Maher, K. P. (1997). Applied imaging technology. Melbourne: St. Vincents Hospital.

Ⓒ A. Manickam 2018

+ Home