CAMRT Radiography Practice Exam

How does increasing the grid ratio affect contrast resolution?

1. Contrast resolution worsens

2. Contrast resolution improves

3. No effect on contrast resolution

4. Exposure factors must be decreased

The correct answer is: Contrast resolution improves

Increasing the grid ratio enhances contrast resolution because a higher grid ratio is designed to absorb more scattered radiation while allowing the primary radiation to pass through. Scattered radiation can degrade the quality of the image by making it look hazy or reducing the contrast between structures. By effectively reducing the amount of scatter that reaches the image receptor, the grid increases the overall contrast of the resulting image, allowing for better differentiation between adjacent tissues or structures. As a result, the details within the image become clearer, and subtle differences in tissue densities are more readily observable. This improvement in contrast resolution is particularly beneficial in radiographic imaging, where it is crucial to distinguish between various types of tissues or pathologies for accurate diagnosis. This principle does not necessarily imply any changes to exposure factors to achieve this effect; rather, the enhancement of image quality is a direct result of the improved scatter management.