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. A high contrast image has a ___ frequency.






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






4. Resolution is controlled by what?






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






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






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






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






9. Increased noise = _____ image contrast.






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






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






12. What determines resolution?






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






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






15. Computers operate from ____ ____ language.






16. Which type of information consists of collected facts?






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






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






19. Electrical connections between the CPU and the other components rung along a system of series or parallel conductors called what?






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






21. When was ENIAC invented?






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






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






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






25. What can memory be transferred as?






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






27. Fluoroscopic noise mostly comes from what?






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






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






30. What are the two most common output devices?






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






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






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






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






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






36. When was ENIAC invented?






37. The _____ the matrix size - the better the resolution.






38. 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.






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






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






41. 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?






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






44. What modalities are array processors useful for?






45. 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?






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






47. Noise is ____ related to contrast.






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






49. Around what time did digital computerization come out for CT and US?






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