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RADT427 Mid. Study

QuestionAnswer
Each square in a matrix is called a __________. picture element
The number of bits per pixel is known as bit: depth
The size of the pixel is determined by the matrix
How dark or light a digital images appears on a display monitor is known as: brightness
The ability of a digital system to display subtle changes in shades of gray is called contrast resolution
The efficiency of a system to convert x-ray input signal into a useful output image is known as detective quantum efficiency
Manipulation of an image prior to sending it to the MIMPS is bad because it can result in a: loss of information
A device that includes a photosensitive array and small pixels, or detector elements, that convert light into electrical charges is known as _____ transistor thin-film
Flat-panel detectors that use indirect conversion technology convert: x-rays to visible light
What is the oldest indirect conversion technology used in image capture applications ? CCD
A detector in which each pixel has its own amplifier is known as a: CMOS
Correct patient demographic input is the responsibility of the technologist
What is the function of a capacitor? It converts x-ray photons to light and stores it
What are some advantages to CCDs? less expensive to manufacture compared to TFT systems and the module design makes repairs and upgrades easy
________ and nuclear medicine were easy converts to digital. Ultrasound
The concept of moving images digitally : teleradiology
_________ is the digital acquisition modality that uses storage phosphor plates to projection image. PSP
__________ what digital radiography system(s) absorb x-rays and convert them into light. Then light is converted into an electrical signal that is sent to the computer for processing. Indirect (CCD, CMOS, TFT)
A _____ is a table that maps the image gray-scale values into some visible output intensity on a monitor. LUT
______ is a networked group of computers, servers, and archives that can be used to manage digital images. MIMPS
When x-rays strike a photostimulable phosphor material, _________ is released. light
MIMPS stands for: Medical Image Management and Processing System
The arrangement of pixels in rows and columns is known as: Matrix
The difference between the actual exposure and the target exposure is known as the: DI- Deviation Index
A graphical representation of a digital image is called a: Histogram
In digital projection radiography, what process is used to normalize an image that has been overexposed? Automatic rescaling
What processing tool will put together multiple images into one single image for display? Image stitching
A PSP plate is usually made of phosphors from what family group? Barium fluorohalide
Layer of the PSP plate that reduces static electricity: Conductive
Layer of the PSP plate sends light in a forward direction when released to the reader? Reflective
Too low of mAs can cause which artifact? Quantum mottle
Which of the two technologies, CCD or CMOS, is more susceptible to noise, has a lower light sensitivity, uses very little power, and is inexpensive to manufacture? CMOS
If a -3 red color indicator is seen on the left side of a deviation index after an exposure, the technologist can assume this is due to ______________ underexposure
If a green color indicator is seen on a deviation index after an exposure, the technologist can assume this is due to ______________ optimal exposure
If a +3 red color indicator is seen on the right side of a deviation index after an exposure, the technologist can assume this is due to ______________ overexposure
T/F: Image aliasing is similar to moire effect. True
Created by: rdwilliams
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