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RAD 217 Final

QuestionAnswer
Radiographic contrast in the digital image is primarily affected by? Application of processing algorithms
Which modality was the first to use the principle of digital imaging? CT
The range of exposure values the image detector is able to produce is known as ________. latitude
The efficiency of a system to convert x-ray input signal into a useful output image is known as _______. DQE
The ability of an imaging system to demonstrate small details of an object is known as ________. spatial resolution
What 2 things can cause quantum mottle? 1) Insufficient mAs 2) Insufficient light
What is the Nyquist theorem? sampling frequency must be twice the input signal bandwidth
A device that includes a photosensitive array and small pixels that convert light into electrical charges is known as a _______ transistor thin film
What does CCD stand for? charged coupled device
Which function determines how images are displayed on the monitor? hanging protocol
A device used to measure the luminescence of areas on the monitor is a ________. photometer
Testing performed before newly installed or majorly-repaired equipment can be accepted by the department is called ______ testing. acceptance
What is most often the weakest link in the digital imaging chain? monitor
The overall efficiency and effectiveness of imaging systems evaluated beyond the mechanics of producing radiographic images CQI
The measure of whether all images completed at the modality make it to the PACS is testing data integrity
The oldest indirect conversion technology used in a variety of image capture applications. CCD
Using an FOV that is much larger than the part being examined will __________ decrease resolution
What are some benefits of using a CsI detector? greater detection of xrays no light spread spatial resolution is higher
What happens when the computer manipulates an image? information is lost
What quality monitor is used for reading cross sectional images? 1K
What quality monitor is used for reading mammography images? 4K
What quality monitor is used for reading x-rays? 2K
The ability to respond to varying levels of exposure dynamic range
Suppressing frequencies is known as ______ or _______. High-pass filtering / masking
Smoothing is a type of ______ filtering low-pass
What is the active element in PSP systems? barium fluorohalide with europium as an activator
Used to reduce the size of the image files to increase the speed of the network transfer of the images. compression
Isolates each pixel element and reacts like a switch to send the electrical charges to the image processor. FET
What 2 companies developed the test patterns? AAPM & SMPTE
Means that images are produced with uniform density and contrast, regardless of the amount of exposure. automatic rescaling
A histogram of the luminance values derived during image acquisition. LUT
What 2 things control spatial resolution in PSP systems? phosphor layer thickness & pixel size
Most health care institutions are accredited by ________. the joint commission (TJC)
Allows magnification of the entire image. zoom
What are the 2 types of film digitizers? laser & CCD
The amount of body part or patient included in the image. FOV
What is the TG18-UN10 & UN80 test pattern used for? luminance
The _______ of data increases the reliability and performance of the system. It is the process of breaking up and spreading data over several disks. striping
Composed of several magnetic disks or hard drives that are linked together in an array RAID
Describes the act of keeping a complete copy of the archive in another remote location? disaster recovery
A digital imaging system's ability to distinguish between similar tissues is termed? contrast resolution
Digital processing involves the systematic application of highly complex mathematical formulas called? algorithms
The greater the bit depth of a digital imaging system, the greater the_____? contrast resolution
The range or level of image contrast in the digital image is primarily controlled by? digital processing
The term describing the imaging being transmitted to a digital archive for viewing and reading by the referring physician or radiologist is ______. image archiving
A look-up table maps ________. image gray scale values
In digital imaging, at least _____ the number of _______ needed to form must be sampled. twice, pIxels
When a signal is reproduced it could cause frequencies above the Nyquist frequency causing ________ aliasing
This technique for enhancement of contrast and edge that amplifies the frequencies of areas of interest high pass
Exposure latitude with digital imaging is more _____ when compared with analog imaging wide
In addition to acquisition pixel size, spatial resolution in the digital image is controlled by? display matrix
Another name for image noise is _____. mottle
What does DICOM stand for? Digital Imaging Communications Medicine
What is the typical speed class of a PSP? 200
What standard is used to communicate between modalities and PACS? DICOM
The network connection that uses glass threads to transmit data and is the most fragile type of network connection is _______. fiber optic
How dark or light a digital image appears on a display monitor is known as _____. brightness
Multiple numeric values divided into an array of small elements capable of being processed is the definition of ____images digital
With this, the plate is scanned and the image's location is determined. image sampling
What is the use of automatic re-scaling without regard to appropriate exposure amount called? dose creep
This involves converting the digital input data to an image with appropriate brightness and contrast. contrast manipulation
This controls how light or dark the image will be. window level
In digital imaging, _________ is used to blacken out the white collimation borders shuttering
This is controlled by using a parameter that changes the steepness of the exposure gradient image contrast
controls the ratio of black to white of the screen image window width
This refers to the emission of light from the phosphor layer PSL
Type of translation that refers to the movement of the imaging plate through the CR reader slow scan direction
Type of translation that refers to the movement of the laser across the imaging plate fast scan direction
This amplifies the light and send it to the ADC photodetector
The laser excites the electrons trapped in the phosphor centers so that the energy may be released in the form of _____________. light
White lines that are parallel to the direction of plate travel are caused by damage to the ________. light guide
materials that absorb x-rays and produce electrical charges photoconductor
phosphors that produce light when absorbing x-rays Scintillators
The components that focus the signal from the scintillators to the CCD are called ______. fiber optics
reducing the phosphor output image to the size of the active area of the CCD demagnification
A detector in which each pixel has its own amplifier is known as a ______. CMOS
What term is used to describe the reading of images outside of the hospital walls, generally at home or in remote locations? teleradiology
Which term describes the technology that allows a film to be digitized and then analyzed by a computer to alert the radiologist of possible questionable areas on a radiograph? CAD
Most QA activities produce ___________ data. quantitative
The place where records of documents are preserved for historic purposes is the ______. archive
A plan for the systematic observation and assessment of the different aspects of a project, service, or facility to make certain that standards of quality are being met QA
A comprehensive set of activities designed to monitor and maintain a piece of equipment is known as ____. QC
Which PACS component interfaces with the radiology information system and hospital information system? image manager
The layer of the imaging plate that traps electrons during exposure is the _______ layer. phosphor/active
Each light photon is assigned a number during ____. digitization
Created by: drocco25
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