Using low kVp in radiographic imaging results in which of the following?

Using low kVp in radiographic imaging results in which of the following?

• A. High contrast
• B. Low contrast
• C. Wide exposure latitude
• D. Narrow exposure latitude

Answer: (A)

Lowering kVp tightens the grayscale, making differences between tissues show up more starkly. This happens because low-energy x-rays interact more via the photoelectric effect, which is highly dependent on tissue density and atomic number. As a result, bone and soft tissue attenuate the beam very differently, producing high image contrast. To keep the image adequately bright, you typically increase the mA (and exposure time), which can raise patient dose. Low kVp also narrows exposure latitude, so small changes in technique can cause large changes in image density. Among the options, high contrast is the best description of what low kVp does to the image.

Lowering kVp tightens the grayscale, making differences between tissues show up more starkly. This happens because low-energy x-rays interact more via the photoelectric effect, which is highly dependent on tissue density and atomic number. As a result, bone and soft tissue attenuate the beam very differently, producing high image contrast. To keep the image adequately bright, you typically increase the mA (and exposure time), which can raise patient dose. Low kVp also narrows exposure latitude, so small changes in technique can cause large changes in image density. Among the options, high contrast is the best description of what low kVp does to the image.