CAMRT Radiography Practice Exam

What is the optimal kVp range for chest imaging?

1. 60 - 80 kVp

2. 80 - 100 kVp

3. 100 - 130 kVp

4. 130 - 150 kVp

The correct answer is: 100 - 130 kVp

The optimal kilovolt peak (kVp) range for chest imaging is typically between 100 to 130 kVp. This range is selected to ensure adequate penetration of the thicker structures of the chest, including the lungs, heart, and surrounding tissues. The kVp influences the contrast and detail of the radiographic image; higher kVp settings enhance the ability to visualize the anatomical structures without excessive exposure time or radiation dose to the patient. Using a kVp in the 100 to 130 range allows for sufficient energy to penetrate through denser structures like the bones of the thorax while still providing an image with good contrast for softer tissues such as the lungs. This is essential for identifying pathological conditions or abnormalities in chest radiographs, such as pneumonia, tumors, or fluid accumulation. Lower kVp ranges, such as 60 to 80 kVp, do not provide enough energy for adequate penetration in the chest, leading to images that may be too bright (overexposed) or too dark (underexposed), which can obscure the necessary details. Ranges above 130 kVp may result in excessive radiation dose without significant benefits in image quality, as the contrast may diminish due to the high energy levels used. Thus, the 100