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






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






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






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






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






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






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






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






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






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






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






12. When was ENIAC invented?






13. 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.






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






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






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






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






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






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






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






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






22. A high contrast image has a ___ frequency.






23. What are the two most common output devices?






24. Noise is measured as what?






25. What can memory be transferred as?






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






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






28. What is the name for a binary digit?






29. Which type of information consists of operating instructions?






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






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






32. What are the two most common output devices?






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






34. What does DICOM stand for?






35. What are the two ways detectors acquire information?






36. Computers operate from ____ ____ language.






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






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






39. What are the two ways detectors acquire information?






40. What does DICOM stand for?






41. Noise is ____ related to contrast.






42. Fluoroscopic noise mostly comes from what?






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






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






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






46. Resolution is controlled by what?






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






48. What is the name for a binary digit?






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






50. 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?