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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 are the 3 classifications of digitized image filters?






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






3. Scanners - mouse - keyboard - input memory disk drive - and paper printers are all forms of what?






4. Noise is measured as what?






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






6. Increased noise = _____ image contrast.






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






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






9. 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?






10. Changes in window width are sometimes called gray scale ____ or ____.






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






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






13. Which type of information consists of collected facts?






14. 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?






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






16. 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?






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






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






19. What are the two most common output devices?






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






21. Noise is ____ related to contrast.






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






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






24. Fluoroscopic noise mostly comes from what?






25. A low contrast image has a ___ frequency.






26. Which computers handle data composed of definite quantities of current?






27. What is the name for a binary digit?






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






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






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






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






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






33. What determines resolution?






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






36. What can memory be transferred as?






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






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






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






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






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






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






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






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






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






46. All medical imaging is achieved with which type of computers?






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






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






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






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







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