Grid Ratio affects the amount of lead in the grid relative to the

Grid Ratio affects the amount of lead in the grid relative to the

• A. Distance between the lead strips
• B. Number of strips per inch
• C. SID
• D. Material composition of the grid

Answer: (A)

Grid ratio describes how much lead is present in the grid compared to the open space between the strips. It is calculated as the height of the lead strips divided by the distance between the strips (the interspace). So, it directly relates to the distance between the lead strips—the interspace. If the interspace shrinks while strip height stays the same, the ratio increases, meaning more lead per unit length and greater attenuation of scatter (with more primary-beam attenuation requiring technique adjustments). The number of strips per inch, SID, or the grid material don’t define the ratio itself, though they influence imaging in other ways.

Grid ratio describes how much lead is present in the grid compared to the open space between the strips. It is calculated as the height of the lead strips divided by the distance between the strips (the interspace). So, it directly relates to the distance between the lead strips—the interspace. If the interspace shrinks while strip height stays the same, the ratio increases, meaning more lead per unit length and greater attenuation of scatter (with more primary-beam attenuation requiring technique adjustments). The number of strips per inch, SID, or the grid material don’t define the ratio itself, though they influence imaging in other ways.