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






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






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






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






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






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






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






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






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






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






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






12. When was ENIAC invented?






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






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






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






16. 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.






17. What is the digital standard for imaging that is designed to ensure that all equipment fro all manufacturers who choose to adhere to the standard are speaking the same computer language?






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






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






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






21. What determines resolution?






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






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






24. Which type of information consists of collected facts?






25. Computerized digital images are described in terms of what






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






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






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






29. Window width and contrast have an ____ relationship.






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






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






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






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






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






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






36. 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.






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






38. Window width and contrast have an ____ relationship.






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






40. A low contrast image has a ___ frequency.






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






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






43. Which type of information consists of operating instructions?






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






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






46. What was the earliest computer device called?






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






48. 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.






49. 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.






50. What can memory be transferred as?