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DHA Radiotherapy Technologist (DHA-RAD) Practice Exams & Test Prep

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DHA DHA-RAD Practice Test Features

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DHA Radiotherapy Technologist Sample Test

1 of 5

The use of a grid during an x-ray of the humerus is required for shoulders with a measurement of:

Correct Answer:

10 cm
the use of a grid during an x-ray of the humerus depends on the thickness of the patient's shoulder. in radiology, a grid is used to improve image quality by absorbing scatter radiation before it reaches the film or detector. scatter radiation can degrade the image by causing fogging and reduced contrast, which makes it harder to discern details within the image.

for adult patients, the criterion for using a grid is based on the measurement of the shoulder. if an adult's shoulder measures 10 cm or more, up to 15 cm, a grid must be used during the x-ray procedure. this thickness signifies a sufficient amount of soft tissue and bone density that can generate enough scatter radiation to warrant the use of a grid to maintain image clarity and diagnostic quality.

conversely, if an adult's shoulder measures less than 10 cm, the use of a grid is not necessary. in these cases, the body part is thin enough that the amount of scatter radiation produced is minimal and unlikely to significantly impact the quality of the radiograph. managing radiation exposure and maintaining image quality without unnecessary complexity are key considerations in such scenarios.

for children, regardless of the shoulder measurement, a grid is typically not used. children's bodies are generally smaller and less dense compared to adults, resulting in less scatter radiation during the imaging process. additionally, minimizing radiation exposure is particularly important in pediatric imaging to reduce the risk of radiation-induced effects.

in summary, the decision to use a grid during a humerus x-ray is based on the size of the patient's shoulder and their age. adults with a shoulder measurement of 10 cm and above require a grid to optimize image quality by reducing scatter radiation, while those with less than 10 cm and children do not need a grid. this approach ensures that each patient receives a radiographic examination tailored to their specific physical characteristics while maintaining safety and image quality.