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25 Cards in this Set
- Front
- Back
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the term k-space refers to
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the spatial frequency domain for images
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In a Fourier Series expansion, a periodic signal (or mathematical function) is expressed as
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A combination of sine and cosine functions
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The network layout that describes how computers are interconnected on a netwrok is called the network...
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topology
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The code of behavior and etiquette that enables computers to communicate with one another is called a
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protocol
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The CONVOLUTION operation involves
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MULTIPLYING a mask by underlying pixels in the image and then summing over all pixels in the mask
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The four field number that behaves like a telephone number to identify a computer on a network is called the
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IP address
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the MEDIAN filter is very effective in image processing at
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removing "salt and pepper" noise (speckle)
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What is the purpose of histogram equalization?
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To stretch the histogram to be as uniform as possible and span the range of available pixel values
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The official repository for patient identification informatin in the healthcare enterprise should be the
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HIS
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For transmissino across a network, digital information is first broken up into
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packets
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The process by which digital information is directed from its source to its destination computer is called
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Routing
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A simple method for image compressino in which repeating data is represented as a single value and the number of times it is repeated is called
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run length encoding
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What is the purpose of the window/level operation on a PACS workstation?
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To utilize the full grayscale dynamic range to display a limited portion of the image histogram
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One of the primary purposes of binary thresholding is?
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Segmentation
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Which of the following is NOT a point operation?
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Median filter
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An emergency backup operation that automatically switches to a standby redundant database or file server if the primary system fails is called
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fallover
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IHE integration profile that is designed to ensure that images appear as intended...
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consistent presentation of images
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Whihc of hte following statements are true about JPEG encoding
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it encodes data using the discrete cosine transform
it was originally intended for color photographic images it can be either lossless or lossy |
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Which imaging problem can be corrected by histogram equalization?
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Not enough contrast
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The oscillation or "ringing" that occurs in signals or images when not enough fourier coeficients are used to represent the signal is called
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the gibbs phenomenon
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A low pass filter, implemented using fourier methods, retains which part of k-space in creating a processed image?
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the center
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The maximum value along the vertical axis of an image histogram is
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the most common pixel value in the image
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The system that tracks the staus of pations and examinations through the diagnostic imaging department is the
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RIS
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JPEG 2000 encodes image data using:
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Region of interest coding
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Modality worklists are generally created by the
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RIS
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