Grid ratio and grid frequency describe

Grid ratio and grid frequency describe

• A. The factors that contribute to the efficiency of a grid
• B. The focal spot size
• C. The distance to the patient
• D. The film speed

Answer: (C)

Grid ratio and grid frequency are about the grid’s construction and how it works with the geometry of the setup. They describe how the grid will interact with the x-ray beam and scattered radiation, and that interaction is governed by distance in the scene—the distance between the patient and the grid (and the grid to the image receptor). If the patient is at a different distance than the grid’s designed focal range, you can get grid cut-off or improper scatter cleanup. So these grid characteristics are most closely tied to the distance to the patient.

Grid ratio and grid frequency are about the grid’s construction and how it works with the geometry of the setup. They describe how the grid will interact with the x-ray beam and scattered radiation, and that interaction is governed by distance in the scene—the distance between the patient and the grid (and the grid to the image receptor). If the patient is at a different distance than the grid’s designed focal range, you can get grid cut-off or improper scatter cleanup. So these grid characteristics are most closely tied to the distance to the patient.