CONTRAST RESOLUTION

#### Physics

CONTRAST RESOLUTION

1. A structure in a patient is demonstrated by two factors - sharpness of the image at its boundary (spatial resolution), contrast between it and adjacent tissues caused by differing signal transmission (contrast resolution).

2. Subject contrast (C) is given by the equation: $C\propto&space;(\mu&space;_{A}-\mu&space;_{B})*t$ (where μ A & μ B = linear attenuation coefficients of tissue A and B, t = tissue thickness).

3. Contrast increases as structure thickness increases.

4. Contrast deceases as μ decreases (e.g. if kV increases).

5. Contrast decreases as noise increases.

##### 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