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






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






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






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






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






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






7. What are the two ways detectors acquire information?






8. Computerized digital images are described in terms of what






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






10. The number of shades of gray is determined by what?






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






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






13. Which type of information consists of collected facts?






14. What determines resolution?






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






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






17. Computer equipment is called what?






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






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






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






21. A high contrast image has a ___ frequency.






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






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






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






25. 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?






26. When detectors acquire their information by ____ they are receiving info from a specific area.






27. Resolution is controlled by what?






28. A low contrast image has a ___ frequency.






29. What modalities are array processors useful for?






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






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






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






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






34. 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.






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






36. Fluoroscopic noise mostly comes from what?






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






38. What was the earliest computer device called?






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






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






41. Resolution is controlled by what?






42. A larger matrix provides ____ pixels.






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






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






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






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






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






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






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






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