How often should technologists check the exposure indicators and deviation index on a radiograph?

How often should technologists check the exposure indicators and deviation index on a radiograph?

• A. After all the required exposures are taken
• B. After the patient is brought back to the floor
• C. After the images have been sent to the radiologist
• D. After each exposure

Answer: (D)

The main idea is to use immediate feedback from exposure indicators and the deviation index to guide technique on the next images. These indicators show how the actual exposure compares to the target for a given view, and the deviation index quantifies how far off you were. Checking them after each exposure lets you adjust technique right away—altering kVp, mA, exposure time, or other factors for the next image—so you stay within the desired dose and image quality range and avoid unnecessary repeats. Waiting until all exposures are done, or until the patient is back on the floor or the radiologist has read the images, misses the chance to optimize subsequent images and can lead to higher patient dose from repeats. In practice, you verify the DI and exposure indicators for every image as they’re acquired, so you can keep each exposure within acceptable limits.

The main idea is to use immediate feedback from exposure indicators and the deviation index to guide technique on the next images. These indicators show how the actual exposure compares to the target for a given view, and the deviation index quantifies how far off you were. Checking them after each exposure lets you adjust technique right away—altering kVp, mA, exposure time, or other factors for the next image—so you stay within the desired dose and image quality range and avoid unnecessary repeats. Waiting until all exposures are done, or until the patient is back on the floor or the radiologist has read the images, misses the chance to optimize subsequent images and can lead to higher patient dose from repeats. In practice, you verify the DI and exposure indicators for every image as they’re acquired, so you can keep each exposure within acceptable limits.