American Society of Radiologic Technologist (ASRT) Practice Exam

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Which radiographic device is used to increase the contrast of images in fluoroscopic procedures?

Collimator
Grid
Image intensifier
Lead apron

The correct answer is: Grid

The grid is specifically designed to improve the contrast of images in fluoroscopic procedures by reducing the amount of scattered radiation that reaches the image receptor. When X-rays pass through the patient, some photons are scattered, which can lead to a reduction in image contrast and overall image quality. The grid works by allowing only the primary X-ray beams that travel in a straight path to hit the image receptor, while absorbing some of the scattered X-rays that would otherwise degrade the image. This enhances the visibility of different tissues and improves the diagnostic quality of fluoroscopy. It's important to differentiate this from other devices. The collimator is used to limit the size of the X-ray beam, helping to reduce patient exposure, but it does not specifically enhance contrast. The image intensifier is a component that amplifies the X-ray signal to create a brighter image for viewing but does not directly increase contrast. Lead aprons are protective garments used to shield the patient and operator from unnecessary radiation exposure and do not play a role in image contrast.