Two types of digital systems are used in intraoral, panoramic, and cephalometric imaging.

• A. Phosphor Storage Plates are the only digital system used.
• B. Direct digital sensors are the only digital system used.
• C. Film-based systems are included as digital.
• D. Phosphor Storage Plates and direct digital sensors.

Answer: (D)

Across intraoral, panoramic, and cephalometric imaging, two digital capture approaches are used. One is indirect digital radiography with phosphor storage plates: the exposed plate holds the image and must be scanned later to convert it to a digital file. The other is direct digital radiography with solid-state sensors (such as CCD or CMOS detectors) that convert X-rays straight into a digital signal for immediate viewing. Film-based systems are analog and are not considered digital capture unless digitized later, so they don’t represent the digital options in these modalities. That’s why including both phosphor storage plates and direct digital sensors accurately describes the two digital systems in use.