What is the difference between kVp and keV?

Asked By: David Lanz | Last Updated: 9th March, 2020
Category: science physics
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In terms of radiography / radiology, kVp is the tube voltage / tube potential between the cathode and the anode, set by the operator. Hence the term "kVp" stands for "kilovolts peak", because it defines the top keV value the x-rays can have.

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Herein, is kV and keV the same?

kV is actually the kilo Voltage at which an x-ray tube is operated. keV is the is the energy that an electron gains when it travels through a potential of one thousand volt.

Subsequently, question is, what does kVp mean? Kilovoltage peak (kVp) is the peak potential applied to the x-ray tube, which accelerates electrons from the cathode to the anode in radiography or computed tomography. Tube voltage, in turn, determines the quantity and quality of the photons generated.

Moreover, what is the difference between kV and kVp?

The applied voltage (kV) accelerates these electrons toward an anode target, ultimately producing x-rays when the electrons are stopped in the anode. kVp controls the property called "radiographic contrast" of an x-ray image (the ratio of transmitted radiation through regions of different thickness or density).

Does increasing kVp increase contrast?

The more penetrating the radiation. The higher the kVp, the longer the scale of contrast on the film. Increasing the kVp increases the chances of more scatter or scatter radiation produced. therefore it decreases Contrast.

37 Related Question Answers Found

What does keV mean?

keV. Abbreviation for kiloelectron volts, a unit of energy in diagnostic radiography and nuclear medicine, equivalent to the kinetic energy gained by an electron falling through a potential of 1 volt.

What does MeV stand for?

million electron volts

What is the unit eV?

Electronvolt. In physics, the electron volt (symbol eV; also written electronvolt) is a unit of energy equal to approximately 1.602×1019 joule (Si unit J). By definition, it is the amount of energy gained by the charge of a single electron moved across an electric potential difference of one volt.

What unit is keV?

electron volt (eV) a unit of energy equal to the energy acquired by an electron in being accelerated through a potential difference of 1 volt; equal to 1.602 × 1019 joule. kiloelectron volt (keV) one thousand electron volts (103 eV). megaelectron volt (MeV) one million electron volts (106 eV).

How many volts are in a MeV?


1 mega-electron volt (MeV) = 1,000,008.45 electron volts (eV)

How do you convert volts to EV?

Quick conversion chart of EV to volt
  1. EV to volt = 1.0E+18 volt.
  2. EV to volt = 2.0E+18 volt.
  3. EV to volt = 3.0E+18 volt.
  4. EV to volt = 4.0E+18 volt.
  5. EV to volt = 5.0E+18 volt.
  6. EV to volt = 6.0E+18 volt.
  7. EV to volt = 7.0E+18 volt.
  8. EV to volt = 8.0E+18 volt.

How many electron volts are in a Watt?

6,241,509,744,511,500,288.00 electron volts

What is KV motor?

Answer: “Kv” refers to the constant velocity of a motor (not to be confused with “kV,” the abbreviation for kilovolt). It is measured by the number of revolutions per minute (rpm) that a motor turns when 1V (one volt) is applied with no load attached to that motor.

What is the 15 rule in radiology?

A 15 percent increase in Kvp is equal to doubling the mAs. However , if you want to maintain radiographic density by increasing kvp by 15 percent, you need to cut your mass in half. Same goes for decreasing kvp by 15 percent. If you want to maintain radiographic density, you need to double your mAs.

Why does increasing kVp decrease contrast?


A higher density material will attenuate more x-rays than a lower density material. A higher kVp will make the x-ray beam more penetrating. This will result in less difference in attenuation between the different parts of the subject, leading to lower contrast.

Is kVp quality or quantity?

Increasing the kVp increases the beam intensity (like increasing mAs), but… Increasing the kVp also increases the beam energy. In other words, kVp affects both the beam quantity (intensity/number of photons) and the beam quality (energy).

What happens when Kilovoltage is increased?

Kilovoltage peak. An increase in kVp extends and intensifies the x-ray emission spectrum, such that the maximal and average/effective energies are higher and the photon number/intensity is higher.

What happens when you increase mAs?

An increase in current (mA) results in a higher production of electrons that are inside the x-ray tube which will, therefore, increase the quantity of radiation; more radiation will cause more photons reaching the detector and hence apparent structural density will decrease, yet the signal intensity will increase.

What is high kVp technique?

High-kVp Technique. The absorbed radiation dose, and the biologically. significant dose to the patient, can be reduced by using the high-kVp technique. Intelligent use of high-kVp technique produces excellent results, but the. x-ray specialist must be aware of its limitations.

What are the effects of kVp and mAs on image quality?


The first experiment showed that, when the film density is kept constant, the higher the kVp, the lower the resolution and image contrast percentage; also, the higher the mAs, the higher the resolution and image contrast percentage.

How does kVp affect quantity?

peak voltage (kVp): beam quantity is approximately proportional to the square of the tube potential. generator type/voltage waveform: reducing ripple increases beam quantity. beam filtration: increasing filtration reduces beam quantity.

What is the difference between kVp and mAs?

In short, mAs is the amount of electrons fired from the cathod to the anode in the xray tube and, respectively, the amount of xrays that will be 'fired' toward the patient. kVp , or kilovoltage peak, is the difference in voltage between the cathode and the anode in the xray tube.