Ohio General X-Ray Machine Operator (GXMO) Practice Exam

Grid Frequency is defined as

Number of lead strips per inch Distance to which grid lines are focused Height of lead strips divided by distance between strips SID at which grid should be used

Correct Answer:

Number of lead strips per inch

Explanation:

Grid frequency is the number of lead strips in a radiographic grid per unit length, typically expressed as lines per inch (lpi). This tells you how many opaque lines appear in one inch of the grid. More strips per inch means thinner, more closely spaced lead lines, which can improve scatter absorption and reduce grid-line visibility, though it can make the grid more sensitive to misalignment or improper exposure. The other descriptions refer to different grid characteristics: how the grid lines are focused relates to grid focus distance, the height of the lead strips divided by the space between them is the grid ratio, and the SID at which a grid should be used is about placement distance, not the number of strips.

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