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Digital Image Processing

Subject : engineering
Instructions:
  • Answer 50 questions in 15 minutes.
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  • Match each statement with the correct term.
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This is a study tool. The 3 wrong answers for each question are randomly chosen from answers to other questions. So, you might find at times the answers obvious, but you will see it re-enforces your understanding as you take the test each time.
1. What provides specific instructions for calculations and sequential steps to be followed?






2. What does a 0 in binary code stand for?






3. It is important that the radiographer understand anatomy from different perspectives due to the methods of digital processing and image information? What are the 3 perspectives?






4. What was the earliest computer device called?






5. The _____ the matrix size - the better the resolution.






6. Which type of information consists of collected facts?






7. What directs information to and from various parts of the computer?






8. Because the range of stored densities is so much wider than the visual range - any digital image is only a small part of the total data obtained - each image is a _____ on the total range of data.






9. Which type of filter amplifies or deletes all but low frequencies - appears to reduce contrast - and is often used to remove high frequency nose.






10. DICOM imaging now includes compatibility via a database system that includes linage of the patient images with the patient's EMR. This database system is called what?






11. Which computers handle data composed of continuously varying electrical currents?






12. When power is turned off - (ROM / RAM) is erased and (ROM / RAM) is maintained






13. It is important that the radiographer understand anatomy from different perspectives due to the methods of digital processing and image information? What are the 3 perspectives?






14. What is the 'noisiest' component of a digital system?






15. Density and contrast of the digital image are controlled by varying the ____ ____ of each pixel.






16. What is a square series of boxes that gives form to the image?






17. What determines resolution?






18. What are the two types of information computers use?






19. Modalities differ in bit depth that is available depending on the capabilities of what?






20. Medical imaging is often achieved from information that has been processed by what?






21. What is the primary limitation with the resolution on digital images?






22. Which memory can only be extracted without alteration; cannot change?






23. Extremely wide window width requires the computer to ignore ___ contrast differences in order to display the entire range of data.






24. Binary systems operate with a ___-symbol language.






25. Computer equipment is called what?






26. Digital detectors are capable of producing ______ shades of gray.






27. The computer either ____ or ____ selected frequencies during the filtering process.






28. What is a specialized computer that functions as a peripheral and uses CPU memory to perform mathematical operations at extremely high speed?






29. Each pixel is capable of representing a wide range of what?






30. What type of memory storage device is inexpensive and the data is stored serially (difficult to access)?






31. What permit input/output of information to or from the CPU?






32. Digitalization of analog information (increases / reduces) the quality and quantity of information?






33. What is the 'random-access' memory that usually functions as temporary storage for programming and operating instructions during use and is constantly changed/?






34. What type of scanning increases resolution but can't be used in real-time dynamic studies?






35. Computer memory is often rated in terms of total ____ memory.






36. What is the frequency response of the incoming signal called?






37. What does a 1 in binary code stand for?






38. What changes the pixel value by addition or subtraction and controls image density?






39. What 3 things were required prior to digital computer applications in medical imaging?






40. The human visual range is ___ or fewer shades of gray.






41. What type of memory storage devices are required for large amounts of data?






42. A high contrast image has a ___ frequency.






43. A __ _____ disk will store over 10000000 bytes of information.






44. What changes the pixel value by multiplication or division and controls image contrast?






45. Noise is measured as what?






46. What is high-pass filtering also called?






47. A low contrast image has a ___ frequency.






48. What are the two ways detectors acquire information?






49. There is a ___ relationship between subject contrast and acquired data contrast.






50. Window width and contrast have an ____ relationship.







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