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Digital Image Processing

Subject : engineering
Instructions:
  • Answer 50 questions in 15 minutes.
  • If you are not ready to take this test, you can study here.
  • Match each statement with the correct term.
  • Don't refresh. All questions and answers are randomly picked and ordered every time you load a test.

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






2. What was the earliest computer device called?






3. What input device do radiographers use on a normal basis?






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






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






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






7. What is the measure of the differences between the data values referred to as?






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






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






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






11. What is the process used in low-pass filtering that is accomplished by averaging adjacent pixels values?






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






13. Each box of an image matrix will display a ____ ____ which can be transformed into a visual brightness or density level.






14. What is the random background information that does not contribute to the image quality?






15. What determines resolution?






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






17. Computer equipment is called what?






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






19. Commercial systems often have a S/N of ____ but the HR systems used in digital fluoro have a S/N between ________.






20. Extremely narrow window width requires the computer to ignore a ___ ____ of data outside the chosen range.






21. Which memory replaces new information with the old; can change?






22. What is critical to how fast the computer system can function?






23. What is the random background information that does not contribute to the image quality?






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






25. Which type of information consists of collected facts?






26. What is high-pass filtering also called?






27. A high S/N indicates ___ noise in the image.






28. Which type of information consists of collected facts?






29. The quality of the data acquired from the IR is measured by what three data characteristics?






30. What is the name for a binary digit?






31. 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.






32. What can memory be transferred as?






33. What is the information stored as magnetic variations referred to as?






34. What type of scanning increases resolution slightly by scanning all 525 lines in order?






35. What is the digital standard for imaging that is designed to ensure that all equipment fro all manufacturers who choose to adhere to the standard are speaking the same computer language?






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






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






38. What is the 'heart' of every computer?






39. If the window level increases - density will _____.






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






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






42. Computer programs are called what?






43. When detectors acquire their information by ____ they are receiving info from a specific area.






44. Extremely narrow window width requires the computer to ignore a ___ ____ of data outside the chosen range.






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






46. What is the process used in low-pass filtering that is accomplished by averaging adjacent pixels values?






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






48. Computer programs are called what?






49. What is the digital standard for imaging that is designed to ensure that all equipment fro all manufacturers who choose to adhere to the standard are speaking the same computer language?






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






Can you answer 50 questions in 15 minutes?



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