Questions and Answers
What are the two basic systems used to acquire a digital image?
Direct imaging and indirect imaging.
Which imaging method uses a reusable phosphor plate that stores the image?
Digital image receptors can tolerate heat sterilization.
False
What does the charge-coupled device (CCD) act as in digital imaging?
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What must be used on digital image sensors to ensure proper infection control?
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The phosphor storage imaging system utilizes a thin, flexible plate coated with ______ crystals.
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What is one critical step after exposure of the phosphor plate?
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What type of device assists in positioning the position indicator device (PID)?
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Match the following digital imaging techniques with their description:
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The imaging plates can be autoclaved for sterilization.
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Study Notes
Types of Digital Imaging Systems
- Conventional x-ray machines are still essential for exposing images in digital imaging systems.
- Image receptors, such as sensors and phosphor storage plates (PSP), are positioned in the same way as film.
- Strict infection control is necessary since sensors and PSPs are reused.
- FDA-cleared disposable, fluid-impervious barriers must be used on digital image sensors and phosphor plates to ensure safety.
- Digital image receptors cannot undergo heat sterilization; adherence to specific manufacturer's instructions is crucial for system operation and patient preparation.
Direct Digital Imaging
- Direct imaging employs a solid-state sensor as the image receptor, featuring an x-ray-sensitive silicon chip with an electronic circuit.
- Sensors are available in various sizes and are placed in the patient's mouth instead of traditional film.
- Charge-coupled devices (CCDs) are the most widely used digital receptors and are implemented in various imaging technologies like telescopes and video cameras.
Indirect Digital Imaging
- Involves reusable phosphor plates that store images, which are later scanned and digitized on a computer.
- PSP imaging systems consist of thin, flexible plates coated with phosphor crystals, similar in size to conventional x-ray films.
- The phosphor layer can retain x-ray energy for a duration before the image is scanned, ensuring it is safeguarded from bright light or heat until scanning occurs.
- Once scanned, the plates lose stored energy when exposed to bright light and can be reused after safeguarding them in specially designed barrier envelopes.
Digitizing Images
- Film-based radiographs can be digitized using desktop scanners that capture and convert light signals, similar to placing a film on a duplicator lightbox.
- This indirect digitizing process may slightly reduce the detail compared to direct digital imaging.
X-ray Film Positioning
- Dental assistants need a thorough understanding of film positioning techniques for high-quality diagnostic images.
Beam Alignment Devices
- Beam alignment devices aid in positioning the position indicator device (PID) concerning the tooth and the film or sensor.
- Rinn XCP instruments utilize color-coded plastic bite-blocks, plastic aiming rings, and metal indicator arms for film techniques.
- Rinn XCP-DS instruments are specifically designed for holding digital sensors.
- The size and shape of digital sensors may vary; it's crucial to use a holder compatible with the specific sensor brand used.
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Description
This quiz covers the types of digital imaging systems and their standard procedures. It highlights the necessity for traditional x-ray machines and discusses the importance of strict infection control measures when using digital sensors and plates. Perfect for students and professionals in the field of radiology.
