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. Computers operate from ____ ____ language.






3. When subject contrast is high - the acquired data contrast will be ____.






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






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






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






7. What was the earliest computer device called?






8. When subject contrast is high - the acquired data contrast will be ____.






9. 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?






10. Computer programs are called what?






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






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






13. Extremely wide window width requires the computer to ignore ___ contrast differences in order to display the entire range of data.






14. In what time period did mathematical theory and solid-state electronics come out?






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






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






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






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






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






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






21. 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.






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






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






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






25. What modalities are array processors useful for?






26. Computerized digital images are described in terms of what






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






28. What is required for collection of input information?






29. 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?






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






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






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






33. A high contrast image has a ___ frequency.






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






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






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






37. 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.






38. Computerized digital images are described in terms of what






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






40. What does DICOM stand for?






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






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






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






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






45. Computer programs are called what?






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






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






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






49. 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?






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