Kilovoltage peak
Updates to Article Attributes
Kilovoltage peak (kVp) is the peak voltage applied to the X-ray tube. It determines the highest energy of X-ray photon. It is responsible for the acceleration of electrons from the cathode to the anode. It also determines tube current in space charge region.
Increase in kVp shifts the X-ray spectrum to right. The radiation dose to the patient is directly proportional to the square of kV. However, it must be remembered that in practical purposes where a different kVp is used in different cases (say for e.g. low kV in mammography as compared to chest X-ray), other factors like mA and film focus distance (FFD) play a role and a complex relation exist to the patient dose (patient dose in mammography is much more than a chest X-ray).
Increasing the kVp will decrease the contrast seen between soft tissue and bone 2.
-<p><strong>Kilovoltage peak (kVp) </strong>is the peak voltage applied to the <a href="/articles/x-ray-tube-1">X-ray tube</a>. It determines the highest energy of X-ray photon. It is responsible for the acceleration of electrons from the cathode to the anode. It also determines tube current in <a href="/articles/space-charge-effect">space charge</a> region. </p><p>Increase in kVp shifts the <a href="/articles/x-ray-spectrum">X-ray spectrum</a> to right. The radiation dose to the patient is directly proportional to the square of kV. However, it must be remembered that in practical purposes where a different kVp is used in different cases (say for e.g. low kV in mammography as compared to chest X-ray), other factors like mA and <a title="film focus distance" href="/articles/film-focus-distance">film focus distance</a> (FFD) play a role and a complex relation exist to the patient dose (patient dose in mammography is much more than a chest X-ray).</p>- +<p><strong>Kilovoltage peak (kVp) </strong>is the peak voltage applied to the <a href="/articles/x-ray-tube-1">X-ray tube</a>. It determines the highest energy of X-ray photon. It is responsible for the acceleration of electrons from the cathode to the anode. It also determines tube current in <a href="/articles/space-charge-effect">space charge</a> region. </p><p>Increase in kVp shifts the <a href="/articles/x-ray-spectrum">X-ray spectrum</a> to right. The radiation dose to the patient is directly proportional to the square of kV. However, it must be remembered that in practical purposes where a different kVp is used in different cases (say for e.g. low kV in mammography as compared to chest X-ray), other factors like mA and <a href="/articles/film-focus-distance">film focus distance</a> (FFD) play a role and a complex relation exist to the patient dose (patient dose in mammography is much more than a chest X-ray).</p><p>Increasing the kVp will decrease the contrast seen between soft tissue and bone <sup>2</sup>.</p><p> </p>
References changed:
- 2. Fuchs A. W. Principles of Radiographic Exposure and Processing. 1st ed. Springfield: Charles C Thomas, 1958.
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