Decreasing kilovoltage peak (kVp) affects differences in signal intensity in the remnant beam by:

Decreasing kilovoltage peak (kVp) affects differences in signal intensity in the remnant beam by:

• A. No change in the difference in signal intensity
• B. Decreased differences in signal intensity
• C. Increased differences in signal intensity
• D. Increased signal-to-noise ratio

Answer: (C)

Lowering kVp increases subject contrast because lower-energy photons are more readily absorbed, especially by dense structures like bone. This makes attenuation differences between tissues more pronounced. As a result, the remnant beam reaching the detector varies more in intensity across different tissues, producing greater differences in signal intensity on the image. In other words, the image shows sharper contrast between structures such as bone and soft tissue when kVp is decreased. The other ideas aren’t as accurate here: lowering kVp won’t inherently guarantee a higher signal-to-noise ratio (needed exposure adjustments to maintain density), and it does change, not preserve, the differences in transmitted signal across tissues.

Lowering kVp increases subject contrast because lower-energy photons are more readily absorbed, especially by dense structures like bone. This makes attenuation differences between tissues more pronounced. As a result, the remnant beam reaching the detector varies more in intensity across different tissues, producing greater differences in signal intensity on the image. In other words, the image shows sharper contrast between structures such as bone and soft tissue when kVp is decreased. The other ideas aren’t as accurate here: lowering kVp won’t inherently guarantee a higher signal-to-noise ratio (needed exposure adjustments to maintain density), and it does change, not preserve, the differences in transmitted signal across tissues.