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






2. What does DICOM stand for?






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






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






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






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






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






8. 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.






9. Computers operate from ____ ____ language.






10. What is the 'noisiest' component of a digital system?






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






12. A high contrast image has a ___ frequency.






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






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






15. 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?






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






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






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






19. The quality of the data acquired from the IR is measured by what three data characteristics?






20. 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.






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






22. 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?






23. Noise is ____ related to contrast.






24. Which type of information consists of operating instructions?






25. 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?






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






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






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






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






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






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






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






33. What can memory be transferred as?






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






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






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






37. Digital detectors are capable of producing ______ shades of gray.






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






39. What is the name for a binary digit?






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






41. What modalities are array processors useful for?






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






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






44. 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.






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






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






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






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






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






50. 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?