Kilovoltage (kV) controls

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Multiple Choice

Kilovoltage (kV) controls

Kilovoltage controls the energy of the x-ray beam, which determines how penetrating the photons are and how the image will look in terms of contrast. Higher kV means more energetic photons that pass through tissues more easily, reducing the difference between different tissues (lower contrast); lower kV increases contrast but reduces penetration. This setting does not determine how long the exposure lasts—that is controlled by the exposure time. The overall darkness or density of the image is mainly governed by the product of tube current and exposure time (mA and time), not by kV. The focal spot size affects sharpness of detail, not the exposure or energy of the beam.

Kilovoltage controls the energy of the x-ray beam, which determines how penetrating the photons are and how the image will look in terms of contrast. Higher kV means more energetic photons that pass through tissues more easily, reducing the difference between different tissues (lower contrast); lower kV increases contrast but reduces penetration. This setting does not determine how long the exposure lasts—that is controlled by the exposure time. The overall darkness or density of the image is mainly governed by the product of tube current and exposure time (mA and time), not by kV. The focal spot size affects sharpness of detail, not the exposure or energy of the beam.

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