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






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






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






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






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






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






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






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






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






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






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






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






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






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






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






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






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






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






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






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






21. 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?






22. Modalities differ in bit depth that is available depending on the capabilities of what?






23. Fluoroscopic noise mostly comes from what?






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






25. When was ENIAC invented?






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






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






28. 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.






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






30. Fluoroscopic noise mostly comes from what?






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






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






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






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






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






36. Noise is measured as what?






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






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






39. What is the system of conductors that connects the various components of a computer system and permits the CPU to accept inputs from any point along the conductor?






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






41. Increased noise = _____ image contrast.






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






43. Which type of information consists of collected facts?






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






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






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






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






48. What does DICOM stand for?






49. What is the name for a binary digit?






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