Which type of equipment presents the greatest risk of exposure for radiologic technologists?

The choice indicating fluoroscopy and mobile radiography presents the greatest risk of exposure for radiologic technologists is accurate due to the nature of how these imaging modalities operate.

Fluoroscopy involves real-time imaging, using a continuous x-ray beam that can lead to higher accumulated radiation doses during procedures. This extended exposure time increases the likelihood of radiation exposure to both patients and healthcare providers, necessitating rigorous safety protocols and protective measures.

Mobile radiography, often conducted in various settings such as emergency rooms or patient bedsides, can also contribute to exposure risk. Since technologists may not always have the benefit of optimized shielding or stable setups found in a controlled environment, they may encounter higher radiation doses than in fixed radiographic settings.

In contrast, while computed tomography (CT) is associated with higher doses than standard radiography, it typically allows for more controlled and shorter exposure times, and sonography and MRI do not involve ionizing radiation, hence posing no risk of radiation exposure.

This understanding underscores the importance of safety practices and the careful management of radiation exposure in clinical settings, particularly for those modalities where exposure is intrinsic to the operation.