Test your basic knowledge |

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






2. 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?






3. What is the name of the 'modern electronic computer'?






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






5. 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?






6. What determines resolution?






7. What modalities are array processors useful for?






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






9. Window width and contrast have an ____ relationship.






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






11. Noise is measured as what?






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






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






14. 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?






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






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






17. Which type of filter amplifies or deletes all but the high frequencies - appears to increase contrast - and is useful in vascular imaging or digital mammo.






18. What is the name for an 8-bit word?






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






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






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






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






23. What is the name for an 8-bit word?






24. 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.






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






26. What are devices that process information?






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






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






29. What are the two ways detectors acquire information?






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






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






32. A low contrast image has a ___ frequency.






33. When subject contrast is high - the acquired data contrast will be ____.






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






35. A high contrast image has a ___ frequency.






36. What is the equation for determining gray scale bit depth?






37. When detectors acquire their information through ____ they are receiving all the info at once.






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






39. What are devices such as keyboard - touch screen monitors - and voice-activation that you put into or connect to a computer?






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






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






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






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






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






45. Computerized digital images are described in terms of what






46. Increased noise = _____ image contrast.






47. Noise is ____ related to contrast.






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






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






50. What is accomplished by transforming the image into frequencies and making mathematical alteration to reproduce the image?







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