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Digital Final

QuestionAnswer
The PSP cassette is backed by aluminum that absorbs backscatter x-rays
which one of the following serves to protect against static build-up, dust collection, and mechanical damage to the imaging plate? Felt Material
The layer of the imaging plate that traps electrons during exposure is the______layer? Active
The imaging plate layer that absorbs stimulating light and reflects emitted light is the________ layer? Color
The reflective layer Sends light in a forward direction
The purpose of the barcode label is to match the image information with the? Patient Identifier
The phosphor layer is made of phosphors from the _____ family. Barium Fluorohalide
The optical mirror in the reader directs the laser. beam to the imaging plate surface
Each light photon is assigned a number during Digitization
The laser scans the imaging plate in a _________ pattern. Raster
The process of scanning the moving imaging plate is known as. Translation
Which of the following does NOT determine PSP resolution? Laser scan speed
PSP imaging plates are erased by flooding the plate with light
The amount of detail present in any image is known as ________ resolution. spatial
The selection of the incorrect body part from the examination menu may result in image misinterpretation
when insufficient light is produced by the imaging plate phosphor, the image will be grainy
Quantum mottle is caused by insufficient light
The higher the number of pixels in a matrix, the higher the image resolution
The number of grid lines per centimeter or lines per inch describes grid frequency
shuttering is a post-exposure image manipulation technique that is added to the screen image
The exposure indicator number is an indication of radiation absorbed by the imaging plate
Cracks in the imaging plate can be caused by removing and replacing the plate in the reader
Europium is the ____________ of the photostimulable phosphor activator
receptor exposure may be defined as Amount of remnat radiation striking the image receptor
The computed radiography cassette is called a(n) __________plate. imaging
The four steps of creating an image with computed radiography are ______________? Metastable state, stimulate, read, and erase
The laser is one of the ___________ features of the computed radiography reader optical
The output signal from the photostimulable phosphor plate is converted from angle to digital by the ____________ Computer controls
Computer radiography imaging produces ______________ gray levels 10,000
Photoconductors are materials that absorb x-ray and produce electrical charges
Scintillators are phosphors that produce light when absorbing x-rays
A device that includes a photosensitive array and small pixels that convert light into electrical charges is known as___________ transistor thin-film
A device that acts like a switch to send electrical charges to the image processor in a direct conversion flat-panel detector is known as ________transistor. field effect
Which of the following is used as a photoconductor? a-Se
Which of the following is not considered a scintillator? a-Se
Flat-panel detectors that use indirect conversion technology convert x-ray to visible light
Indirect conversion in flat-panel detectors is a _________ step process. two
The type of flat panel detector that uses thin films of silicon integrated with arrays of photodiodes is known as amorphous silicon detector
CsI detectors use thin crystalline needles
In CsI detectors there is very little light spread
Possible causes of image lag include all except underexposure
Which of the following can be done to decrease the chance of having image lag occur in the next image? Increase the amount of time between exposures
The photoconductor generally used with a TFT array in direct capture digital imaging is amorphous selenium
what is the effect of TFT DEL size in cassetteless digital imaging The smaller the DEL size, the better the spatial resolution
what is the term that describes no data being collected from a damage active matrix array? preview dead pixels
A characteristic displayed by certain materials that emit light when they are exposed to another type of light is known as photostimulable luminescence PSL
Failure of the reader to find the collimation edges of an image will results in image cutoff
Data collected within the collimator are represented by a histogram
A histogram displays the useful signal by locating maximum and minimum signal
The Nyquist theorem states that the sampling frequency must be twice the input signal bandwidth
If too few pixels are sampled, the results will be low resolution
Raw data used to form the image histogram are compared with a normal histogram referenced by the computer
Loss of detail in a digitally processed image occurs because of the number of conversion
The longer an image is stored in the computed radiography (CR) cassette, the more energy is lost by the electrons
A wraparound image or image aliasing occurs when sampling occurs less than twice per cycle
In an effort to display the pixels for the area of interest when exposure is greater or less than what is needed to produce an image ______occurs automatic rescaling
Auto rescaling means that images are produced, regardless of the amount of exposure, with uniform contrast and density
A look-up table is not used as a reference to set appropriate kilovoltage peak and milliampere-seconds values
Changing the slope of the look-up table graph will increase or decrease contrast
If all of the shades were left in an image after processing, the contrast would be too low
The improper algorithm application may result in degradation of the image
The more manipulation of the image the greater the loss of information
Amplification of the frequencies of the areas of interest is known as edge enhancement
Suppressing frequencies in the areas of interest is known as masking
Low pass filtering is also known as smoothing
High pass filtering is useful for enhancing organs and soft tissue
Averaging the frequency of each pixel with surrounding pixel values to remove high frequency noise is called low-pass filtering
Image level parameters control image brightness
Window width controls the ratio of black and white, also known as contrast
Excessive light entering the eye when viewing an image is known as ______glare veil
An image manipulation process that fills in the background so that it is darkened is known as shuttering
The image reader scans and reads the image from the leading edge of the imaging plate to the opposite end
The process of joining two or more images into one continuous image is known as image stitching
The workstation function that allows selection of present terms or manual text input is terminated image annotation
Input of annotation for identification of the patients left or right side should be used in conjunction with the technologist markers
proper patient demographic input ensures linking of all the patient files
The least expensive network to install is a LAN
The first version of DICOM was completed in 1985
DICOM was considered better than previous exchange mechanisms for all but which one of the following? It did not require a conformance system.
The standard that oversees most computerized clinical and administrative data is known as HL-7.
RIS is specific to Radiology
The system that holds a specific patient’s lab results, radiology reports, and physician notes is the electronic medical record (EMR).
The system that contains patient information, billing records, and inpatient orders is the HIS
The acronym PACS stands for ______ system picture archival and communication
A PACS consists of 1. image acquisition. 2. display workstation. 3. archive servers. 1. image acquisition. 2. display workstation. 3. archive servers.
A universally accepted standard for exchanging medical imaging via a networked set of display workstations, archive, and imaging modalities is DICOM.
Any computer that a health care worker uses to view a digital image is a(n) display workstation.
Which part of the PACS houses all of the historic digital image data along with the current digital data being generated by the modalities? Archive
The acronym RIS stands for ______ system. radiology information
Which is the most interactive part of a PACS? Display workstation
What factors might be used when determining the best type of monitor for each workstation? resolution, size, monitor orientation
Which term best describes a basic picture element on a display? Pixel
A square table of numbers that represents the intensity to be displayed on the monitor is a matrix
Which of the following would be considered categories for display workstations? Primary reading, technologist QC, archive server
Which workstation is used to review images after acquisition but before being sent off for reporting? Technologist QC
Which of the following would be considered categories of workstation functions? navigation and image management
Which of the following are the primary functions of the picture archiving and communications system (PACS)? Network communication between image acquisition modalities, Specialty image processing and annotation, Image storage
The component of HIS that functions to provide each modality work list, patient tracking, scheduling, and image tracking is known as the hospital information System (HIS)
Pixel pitch is the measurement from? the center of one pixel to the center of another pixel
What measures the ability of detector to transfer spatial characteristics to image? MTF Modular transfer function
Which of the following is a post processing operation? edge enchantment
How much Can digital image reduce patient dose? 20-50%
A measurement of x-ray absorption efficiency is known as? DQE
What increases SNR ( signal to noise ratio)? Higher mAs
100% contrast appears: black and white
smaller pixel pitch size increased SNR
The layers used in indirect DR that could be a lens of fiber optics is the ? coupling element
What term could be used in place of “number of pixels”? Matrix size
The human eye can detect about _______ Shades of gray at once? 30
Binary code is made of combinations of zeros and ones, Any singular 0 or 1 is called a ? Bit
The worst visible defect seen in digital imaging resulting from improper technique is called? Quantum mottle
If the collimated area changes between images, you could say the _______ has changed ? FOV
Spatial resolution is measured in? lp/mm
Either CSL or GdOS can be used with_______In a form of indirect DR: amorphous silicone
An individual picture element of an image matrix is referred to as a? pixel
Multiple numeric values divided into an array of small elements capable of being processed is the definition of _____ images. digital
Which of the following statements is not true? Changing the matrix and the FOV will not change the size of the pixel.
Each square in a matrix is called a picture element.
The number of bits per pixel is known as bit depth
If a pixel has a bit depth of 29, the number of gray tones that pixel can produce is 512
The size of the pixel is determined by the matrix
Which of the following statements is not true? Exposure index refers to the amount of exposure to the patient.
The measurement for radiation that was incident on the image receptor for a particular exposure is known as KIND
How dark or light a digital image appears on a display monitor is known as contrast resolution
The ability of a digital system to display subtle changes in shades of gray is called contrast resolution
The ability of an imaging system to demonstrate small details of an object is known as spatial resolution
A system’s ability to respond to varying levels of exposure, resulting in more detail, is referred to as dynamic range
A perfect image processing system would have an MTF of 100%
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 detective quantum efficiency.
Digital imaging techniques are always applied to Magnetic resonance imaging, ultrasound, CT
In digital radiography, the brightness of the image is determined by pixel values
The dynamic range determines the degree of __________________ in the image. contrast resolution
Spatial resolution is determined by the ratio of ________________ to ____________. field of view, matrix size
Created by: 2433047070171477
 

 



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