Displays & Scan Converters
An image that is only composed of these 2 shades: black and white.
What is a bistable image?
The smallest building block of a digital picture.
What is a pixel?
Any processing of reflected signals before storage
What is preprocessing?
An image processing method that emphasizes sharp edge boundaries in an image and makes pictures look sharper.
What is edge enhancement?
PACS is an acronym for this.
What is a picture archiving and communications system?
Determines the range of brilliancies within the displayed images.
What is contrast?
Derived from the term "binary digit".
What is a bit?
Write magnification is a form of this.
What is preprocessing?
A method of constructing new data points to fill in gaps between scan lines. This improves spatial resolution.
What is fill-in interpolation?
DICOM is an acronym for this.
This electronic component is required for gray scale imaging.
What is a scan converter?
This improves with a higher pixel density.
What is spatial resolution?
Black/white inversion is a form of this.
An image processing technique that continues to display information from older images.
What is persistence/temporal compounding/temporal averaging?
A set of standards that allow medical imaging systems to communicate over a network.
What is DICOM?
Name at least 2 limitations of analog scan converters.
What is deterioration, instability, image flicker or image fade?
Consists of two bytes, or 16 bits.
What is a word?
The name for the selected enlarged portion of a magnified image that fills the entire screen.
What is the region of interest/ROI?
A method of using information from several different imaging angles to produce a single image.
What is spatial compounding?
This has virtually instant access to archived studies, doesn't degrade data, and is able to electronically transmit images and reports to remote sites.
What are three major advantages of a PACS system/ What is a PACS system?
A funnel shaped vaccuum tube with an electron gun located within its smaller end. A stream of electrons contain the image information and are shot out of the gun. The larger end of the tube contains a dielectric matrix/silicon wafer that contain electron buckets that store image information.
What is an analog scan converter?
With an increasing number of bits per pixel, more shades of gray appear on the image. Images with many gray shades have an improved __________?
contrast resolution
In write magnification, this is greater than what it was in the ROI's portion of the original image.
What is the number of pixels or scan lines?
A dynamic technique that produces images from sound reflections by using tissue stiffness data combined with ultrasound reflections.
What is elastography?
The primary digital storage device used in a PACS system.
What is a computer hard drive?