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






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






3. 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.






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






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






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






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






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






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






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






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






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






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






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






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






16. Each pixel is capable of representing a wide range of what?






17. What is the mathematical algorithm used to create all medical images?






18. Resolution is controlled by what?






19. What determines resolution?






20. What can memory be transferred as?






21. 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.






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






23. 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?






24. 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.






25. When was ENIAC invented?






26. 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.






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






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






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






30. 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?






31. 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?






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






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






34. Noise is ____ related to contrast.






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






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






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






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






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






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






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






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






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






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






45. 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?






46. What determines resolution?






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






48. Computer equipment is called what?






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






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