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






2. What are devices that process information?






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






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






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






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






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






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






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






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






11. Which type of information consists of operating instructions?






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






13. Noise is measured as what?






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






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






16. What does DICOM stand for?






17. ____ circuits permit simultaneous transmission of information while ____ circuits transmit sequentially.






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






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






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






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






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






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






24. What permit input/output of information to or from the CPU?






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






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






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






28. Increased noise = _____ image contrast.






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






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






31. Which computers handle data composed of continuously varying electrical currents?






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






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






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






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






36. When detectors acquire their information through ____ they are receiving all the info at once.






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






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






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






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






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






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






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






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






45. What are the two most common output devices?






46. When was ENIAC invented?






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






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






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 are devices that process information?