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Questions and Answers
A charge-coupled device (CCD) converts light or x-ray photons into an electrical charge or signal.
A charge-coupled device (CCD) converts light or x-ray photons into an electrical charge or signal.
True
A digital image is composed of line pairs per millimeter (lp/mm).
A digital image is composed of line pairs per millimeter (lp/mm).
False
Indirect digital imaging requires a sensor to be scanned after exposure to x-radiation.
Indirect digital imaging requires a sensor to be scanned after exposure to x-radiation.
True
An 8 bit-depth image can represent 128 shades of gray.
An 8 bit-depth image can represent 128 shades of gray.
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Digital subtraction is a technique that makes black images appear white and white images appear black.
Digital subtraction is a technique that makes black images appear white and white images appear black.
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Storage phosphor imaging captures an image using a phosphor-coated plate that is scanned with a laser.
Storage phosphor imaging captures an image using a phosphor-coated plate that is scanned with a laser.
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Digital imaging relies on a conventional film to capture images.
Digital imaging relies on a conventional film to capture images.
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Direct digital imaging involves exposing an intraoral sensor to x-radiation to capture dental images.
Direct digital imaging involves exposing an intraoral sensor to x-radiation to capture dental images.
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Pixels are defined as discrete units of information in digital electronic images.
Pixels are defined as discrete units of information in digital electronic images.
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The term 'digitize' refers to converting an image into analog form.
The term 'digitize' refers to converting an image into analog form.
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Study Notes
Digital Imaging
- Digital imaging is a method of capturing an image using a sensor, breaking it into electronic pieces, and presenting and storing the image using a computer and related imaging software.
- Digital image is composed of pixels, which are discrete units of information.
- Analog-to-digital converter converts data elements acquired by the sensor from analog to digital form.
- Bit-depth image determines the number of possible gray-scale combinations for each pixel. An 8-bit depth image has 256 shades of gray (2⁸).
- Digital subtraction is a method of reversing the gray scale as an image is viewed. Radiolucent images (normally black) appear white, and radiopaque images (normally white) appear black.
- Line pairs/millimeter (lp/mm) is a measurement used to evaluate the computer's ability to capture the resolution (or detail) of an image.
Digital Image Acquisition
- Direct digital imaging uses an intraoral sensor exposed to x-radiation to capture a dental image that can be viewed on a computer monitor.
- Indirect digital imaging uses a sensor scanned after exposure to x-radiation and then converted into a digital form that can be viewed on a computer monitor.
- Storage phosphor imaging records the image on a phosphor-coated plate, which is then placed into an electronic processor and scanned by a laser to produce an image on a computer monitor.
Key Components
- Sensor: A receptor used to capture intraoral or extraoral images in digital imaging.
- Charge-coupled device (CCD): A solid-state silicon chip detector that converts light or x-ray photons into an electrical charge or signal. This is found in the sensor.
Other Terms
- Nalog image: A radiographic image produced by conventional film.
- Digitize: To convert an image into a digital form that can be processed by a computer.
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Description
This quiz covers the fundamentals of digital imaging and the techniques used in digital image acquisition. Explore concepts such as pixel composition, analog-to-digital conversion, and image resolution measurements. Ideal for those studying imaging technologies in healthcare.
