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






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






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






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






5. Window width and contrast have an ____ relationship.






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






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






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






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






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






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






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






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






14. 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.






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






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






17. What modalities are array processors useful for?






18. 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?






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






20. 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?






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






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






23. What determines resolution?






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






25. Resolution is controlled by what?






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






27. 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?






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






29. Computer programs are called what?






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






31. What is a specialized computer that functions as a peripheral and uses CPU memory to perform mathematical operations at extremely high speed?






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






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






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






35. A larger matrix provides ____ pixels.






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






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






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






39. What are the two ways detectors acquire information?






40. What are devices that process information?






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






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






43. What provides specific instructions for calculations and sequential steps to be followed?






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






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






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






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






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






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






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