CAMRT Radiography Practice Exam

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When should a grid be utilized in radiography?

If part thickness is over 5 cm and kVp is over 65
If part thickness is over 8 cm and kVp is over 75
If part thickness is over 10 cm and kVp is over 70
If part thickness is over 12 cm and kVp is over 80

The correct answer is: If part thickness is over 10 cm and kVp is over 70

A grid should be utilized in radiography when the part thickness is over 10 cm and the kVp is over 70 because this combination means that the radiograph is more likely to include scatter radiation, which can significantly degrade image quality. The presence of a grid helps to absorb some of this scatter and improve the overall contrast of the image. Using a grid helps in scenarios where thicker body parts are being imaged since the likelihood of scatter increases with both thickness and energy of the x-ray beam. At this threshold of 10 cm thickness and 70 kVp, radiographers can effectively maintain quality imaging by managing unwanted scatter that can muddy the clarity of diagnostic images. In contrast, the other options suggest different thickness and kVp thresholds that either do not sufficiently account for the effects of scatter radiation on image quality or are less universally applicable across varying imaging situations. The specific thresholds in option C are well-established best practices within the field of radiography, ensuring optimal outcomes for diagnostic imaging.