Which statement about exposure latitude with low kVp is true?

Which statement about exposure latitude with low kVp is true?

• A. Wide exposure latitude
• B. Narrow exposure latitude
• C. Moderate exposure latitude
• D. Undefined exposure latitude

Answer: (B)

Exposure latitude is the range of exposures that will still produce a diagnostically acceptable image. When the kVp is low, the beam has higher contrast and the image density becomes very sensitive to small changes in exposure. Because low-energy photons are more readily absorbed and color density changes rapidly on film or a detector, a slight under- or overexposure quickly pushes the image out of acceptable quality. That makes the acceptable exposure window narrow. In contrast, higher kVp smooths out those density changes, broadening the latitude, since the image changes more gradually with exposure variations. So, with low kVp, you’d expect a narrow exposure latitude.

Exposure latitude is the range of exposures that will still produce a diagnostically acceptable image. When the kVp is low, the beam has higher contrast and the image density becomes very sensitive to small changes in exposure. Because low-energy photons are more readily absorbed and color density changes rapidly on film or a detector, a slight under- or overexposure quickly pushes the image out of acceptable quality. That makes the acceptable exposure window narrow. In contrast, higher kVp smooths out those density changes, broadening the latitude, since the image changes more gradually with exposure variations. So, with low kVp, you’d expect a narrow exposure latitude.