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CONTRAST MEDIA

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CONTRAST MEDIA

1. There are two main ways to improve soft tissue contrast - lower kV (but this increases dose), use a contrast medium.

2. Radiopaque contrast media have a sufficiently high atomic number to maximise photoelectric absorption. Their K-edge lies just to the left of the spectrum of X-rays leaving the patient:
- Iodine (Z = 53, E = 33 keV)
- Barium (Z = 56, E = 37 keV)


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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

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