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. 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.






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






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






4. Resolution is controlled by what?






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






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






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






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






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






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






11. What does DICOM stand for?






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






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






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






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






16. What does DICOM stand for?






17. Around what time did digital computerization come out for CT and US?






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






19. Resolution is controlled by what?






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






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






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






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






24. Noise is ____ related to contrast.






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






26. Computerized digital images are described in terms of what






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






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






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






30. 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?






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






32. 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?






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






34. Computer equipment is called what?






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






36. Noise is measured as what?






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






38. What type of memory storage devices are required for large amounts of data?






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






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






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






42. Scanners - mouse - keyboard - input memory disk drive - and paper printers are all forms of what?






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






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






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






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






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






48. 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?






49. The _____ the matrix size - the better the resolution.






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