Test your basic knowledge |

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 is the information stored as magnetic variations referred to as?






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






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






4. 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?






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






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






7. Computerized digital images are described in terms of what






8. If window width increases - image contrast will ____.






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. What are devices that process information?






11. 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?






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






13. What are the 3 classifications of digitized image filters?






14. What is an individual matrix box or picture element?






15. Which type of information consists of collected facts?






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






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






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






19. In what time period did mathematical theory and solid-state electronics come out?






20. Noise is ____ related to contrast.






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






22. In what time period did microchip technology come out?






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






24. What is the 'read-only' memory that contains basic operating instructions that are almost never changing?






25. What are the two most common output devices?






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






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






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






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






30. What determines resolution?






31. What is high-pass filtering also called?






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






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






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






35. What can memory be transferred as?






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






37. Increased noise = _____ image contrast.






38. A low contrast image has a ___ frequency.






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






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






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






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






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






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






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






46. What are the two most common output devices?






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






48. ____ circuits permit simultaneous transmission of information while ____ circuits transmit sequentially.






49. What is an image that has been converted into numerical values for transmission or processing?






50. Which type of filter amplifies or deletes all but a selected range or band of frequencies and is useful in the elimination of characteristic emission peaks?







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