CAMRT Radiography Practice Exam

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What is the grid conversion formula?

mAs1 = GCF1 * mAs2
mAs1 / mAs2 = GCF2 / GCF1
mAs1 / mAs2 = GCF1 / GCF2
mAs2 = GCF1 * mAs1

The correct answer is: mAs1 / mAs2 = GCF1 / GCF2

The grid conversion formula is essential in radiography as it helps radiologic technologists adjust exposure factors when using a grid. The formula relates the milliampere-seconds (mAs) before and after the introduction of a grid, taking into account the grid conversion factors (GCF) for the different grid setups. The correct relationship is that the ratio of mAs values is equal to the ratio of the grid conversion factors. Therefore, stating that the ratio of mAs1 to mAs2 equals the ratio of GCF1 to GCF2 accurately reflects the underlying physics of radiation exposure and grid use. This formula is crucial when transitioning from one grid setup to another, ensuring that the radiographic image maintains proper density despite the change in grid characteristics. Understanding this formula allows radiologic technologists to effectively calculate the required adjustments needed in exposure settings, which ensures optimal image quality and minimizes patient radiation exposure.