I'm not sure what kVp means, can you clarify? As of right now, it is hard to understand what exactly you're asking. Add a comment. Active Oldest Votes. Improve this answer. Martin Ueding Martin Ueding 8, 4 4 gold badges 34 34 silver badges 56 56 bronze badges.
I was browsing through your MSc coursework on your blog to see what's taught these days: looks like you had fun. Clint Clint 11 2 2 bronze badges. Sign up or log in Sign up using Google. Sign up using Facebook. Sign up using Email and Password. Post as a guest Name. Email Required, but never shown. Featured on Meta. CT angiography of the abdomen 10 or when noise related to attenuation is less of a problem e.
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Goel, A. Kilovoltage peak. Reference article, Radiopaedia. Tube potential Peak tube potential Tube voltage kVp. URL of Article. Image quality The first consideration when selecting the kVp is ensuring adequate penetration and exposure 5,7 , which depends on photon number, photon energy, and tissue attenuation which depends on attenuation coefficient and thickness.
In other words, if you use kV typical standard X-ray across the X-ray lamp, the keV spectrum will range from approximately 15keV to keV. If you use 60kV typical fluoroscope the keV spectrum will range from approximately 15keV to 60keV. Furthermore, the higher keV energies in the main beam do not scatter as much as they pass through the patient, or object, being X-rayed, whilst the lower energies scatter more easily because they do not have the penetrating power.
Therefore, if you look at the resulting keV spectrum for the scatter radiation, the top end of the keV spectrum is reduced. Typically, if you generated the main beam using kV on the lamp, the main beam energy, in terms of keV, will range from approximately 15keV to keV Fig 1 , and the scatter radiation will range from approximately 15keV to just over 60keV Fig 3. If you generated the main beam using 60kV across the lamp, the main beam energy, in terms of keV, will range from approximately 15keV to 60keV Fig 2 , and the scatter radiation will range from approximately 15keV to just over 45keV Fig 4.
Note: The keV scale of the Y axis Photon Count would be approximately a 50th of the graphs for the main beam. Absorbed dose is created from radiation that does not pass through the body.
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