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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 is the primary limitation with the resolution on digital images?






2. Because electrical currents are understood as being either on or off - the binary system consists of information recorded as either a _ for off or a _ for on.






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






4. What are devices that process information?






5. 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.






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






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






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






9. What is the system of conductors that connects the various components of a computer system and permits the CPU to accept inputs from any point along the conductor?






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






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






12. What modalities are array processors useful for?






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






14. A larger matrix provides ____ pixels.






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






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






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






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






19. What is the raw data to which a Fourier Transformation is applied to create the digital image?






20. Commercial units scan only 262.5 lines out of 525 in each pass thus producing ____ for diagnostic imaging.






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






22. What was the earliest computer device called?






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






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






25. What is high-pass filtering also called?






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






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






28. Fluoroscopic noise mostly comes from what?






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






30. Increased noise = _____ image contrast.






31. The ____ is the heart of the computer while the ___ is the vessels.






32. What are devices that process information?






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






34. What are the two most common output devices?






35. Noise is measured as what?






36. Which type of information consists of collected facts?






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






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






39. Which type of information consists of collected facts?






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






41. In medical imaging - each pixel value corresponds to a 3-D volume of tissue known as what?






42. 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?






43. What was the earliest computer device called?






44. A high contrast image has a ___ frequency.






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






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






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






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






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






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







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