American Society of Radiologic Technologist (ASRT) Practice Exam

The image receptor that uses amorphous silicon for capturing images is known as:

1. CR Plate

2. DR Unit

3. Film screen

4. Computed radiography

The correct answer is: DR Unit

Amorphous silicon is a key component in digital radiography systems, particularly in direct radiography (DR) units. This technology uses amorphous silicon as a photoconductor, which converts X-rays directly into electrical charges that can be processed to create an image. The advantages of using amorphous silicon include high image quality, faster image acquisition, and the ability to manipulate images digitally after they have been captured. This method of imaging is distinct from computed radiography, which utilizes a CR plate. In CR, images are captured on a photostimulable phosphor plate that must be processed in a separate system to convert the captured image into a digital format. Film screen combinations, while used traditionally in radiographic practice, rely on film that is sensitive to X-ray exposure and does not utilize amorphous silicon technology. In summary, the correct identification of the image receptor using amorphous silicon points to DR units as the technology incorporates this material in a way that directly enhances the capture and processing of radiographic images.