American Registry of Radiologic Technologists (ARRT) Practice Exam

Grid use should be considered in radiology imaging primarily when there is significant scatter. Grids are specifically designed to improve the quality of the image by reducing the amount of scattered radiation that reaches the detector. Scatter radiation can degrade image contrast and lead to poor diagnostic quality. By using a grid, only the primary radiation that comes in a straight line from the source to the detector is allowed to produce the image, while scattered rays are absorbed by the grid materials.

In situations where high levels of scatter are generated, such as in thicker anatomical regions or with certain imaging techniques, employing a grid can be crucial for obtaining clearer and more diagnostic images. This enhancement in image quality is essential for accurate diagnoses and effective treatment planning.

While there might be considerations for imaging fissures, soft tissues, or scenarios requiring low exposure, these conditions do not directly relate to the necessity for grid use as effectively as the presence of significant scatter.