Final answer:
The grid ratio in radiology is calculated using the height of the lead strips divided by the width of the interspace material. This calculation measures the capacity of the grid to eliminate scatter radiation, thus improving image clarity.
Step-by-step explanation:
To determine grid ratio in radiology, one should opt for option D. That is, the grid ratio is measured as the height of the lead strips divided by the width of the interspace material. This calculation is used to measure the amount of scatter radiation the grid can eliminate.
Consider the case where the lead strips have a height of 2 mm and the interspace material, say air, has a width of 0.25 mm. Then, using the formula: grid ratio = height of lead strips / width of interspace material, we get grid ratio = 2/0.25 = 8:1. This implies for every 8 units of height, there is one unit of interspace width.
The grid ratio therefore assesses the efficiency of a radiological grid to capture and eliminate scatter radiation, thereby improving the clarity of the final image.
Learn more about Grid Ratio