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






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






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






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






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






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






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






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






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






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






12. What are devices that process information?






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






14. A low contrast image has a ___ frequency.






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






16. Noise is ____ related to contrast.






17. Noise is measured as what?






18. Increased noise = _____ image contrast.






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






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






21. Computerized digital images are described in terms of what






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






23. DICOM imaging now includes compatibility via a database system that includes linage of the patient images with the patient's EMR. This database system is called what?






24. What is the name for a binary digit?






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






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






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






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






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






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






31. Computer equipment is called what?






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






33. 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?






34. What was the earliest computer device called?






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






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






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 directs information to and from various parts of the computer?






40. Increased noise = _____ image contrast.






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






42. What are devices that process information?






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






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






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






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






47. Computer equipment is called what?






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






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






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