Chapter 8: Digital Imaging Flashcards
The fundamentals and types of Digital Imaging, Digital Imaging Equipment
Define the term: sensor
in digital imaging, an image receptor that is used to capture an intraoral or extraoral image
Define the term: indirect digital imaging
a method of obtaining a digital imaging from a sensor after exposure to x-rays by using a scanner to convert information into a digital form so that it can be viewed on a computer monitor
What are the two methods of obtaining a digital image?
- direct digital imaging
- indirect digital imaging
Define the term: digital imaging
a system of filmless imaging used to capture an image using a sensor, breaking it into electronic pieces, and presenting and storing the image using a computer
When comparing digital imaging to conventional film, what is the advantage of the gray-scale resolution?
digital imaging has a greater gray-scale resolution with up to 256 shades of gray, in comparison to 25 shades of gray on conventional film
Define the term: image
a picture or likeness of an object
Define the term: charge-coupled device (CCD)
a solid-state silicon chip detector found in an intraoral digital sensor that converts light or x-ray photons into an electrical charge or signal
Define the term: curve of Spee
the anterior-posterior anatomic curvature of the occlusal surfaces of the teeth
Define the term: digital subtraction
a feature of digital imaging used to reverse the gray scale as an image is being viewed, causing radiolucent images (normally black) to appear white and radiopaque images (normally white) to appear black
Define the term: digital image
an image composed of pixels
Define the term: bit-depth image
the number of possible gray-scale combinations for each pixel
Define the term: digitize
in digital imaging, to convert an image into digital form that, in turn, can be processed by a computer
Define the term: labial mounting
an image mounting method in which the radiographs are placed in the mount for the dental radiographer to view the images from the labial aspect
Define the term: analog-to-digital converter (ADC)
the method used to convert data elements acquired by the sensor are communicated to the computer in analog form and then converted into digital form
What is one of the main disadvantages of digital imaging in comparison to conventional film?
the size and thickness of the sensor can be uncomfortable for patients or can be more common in inducing their gag reflex