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






2. What determines resolution?






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






4. Noise is measured as what?






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






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






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






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






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






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






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






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






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






14. Which type of information consists of collected facts?






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






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






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






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






19. Computerized digital images are described in terms of what






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






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






22. 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.






23. Fluoroscopic noise mostly comes from what?






24. 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?






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






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






27. What is the information stored as magnetic variations referred to as?






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






29. Window width and contrast have an ____ relationship.






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






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






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






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






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






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






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






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






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






39. What are the two ways detectors acquire information?






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






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






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






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






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






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






46. 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?






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






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






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






50. 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.







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