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 are devices that process information?






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






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






4. A high contrast image has a ___ frequency.






5. What is the name for a binary digit?






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






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






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






9. A larger matrix provides ____ pixels.






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






11. Noise is measured as what?






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






13. Who or What is responsible for density changes on a digital image? On a manual image






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






15. Which type of information consists of collected facts?






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






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






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






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






20. Resolution is controlled by what?






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






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






23. 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.






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






25. Computerized digital images are described in terms of what






26. 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.






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






28. What was the earliest computer device called?






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






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






31. When was ENIAC invented?






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






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






34. What does DICOM stand for?






35. 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?






36. Increased noise = _____ image contrast.






37. What modalities are array processors useful for?






38. What is the name for a binary digit?






39. What is the process used in low-pass filtering that is accomplished by averaging adjacent pixels values?






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






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






43. When detectors acquire their information through ____ they are receiving all the info at once.






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






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






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






47. Noise is ____ related to contrast.






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






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






50. What determines resolution?