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






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






3. A __ _____ disk will store over 10000000 bytes of information.






4. Window width and contrast have an ____ relationship.






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






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






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






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






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






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






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






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






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






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






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






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






17. Resolution is controlled by what?






18. 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?






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






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






21. When was ENIAC invented?






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






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






24. What is the name for a binary digit?






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






26. A low contrast image has a ___ frequency.






27. 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.






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






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






30. What is the 'random-access' memory that usually functions as temporary storage for programming and operating instructions during use and is constantly changed/?






31. Noise is measured as what?






32. 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.






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






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






35. What modalities are array processors useful for?






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






37. What are the two most common output devices?






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






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






40. Increased noise = _____ image contrast.






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






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






43. Fluoroscopic noise mostly comes from what?






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






45. Computerized digital images are described in terms of what






46. Which type of filter amplifies or deletes all but low frequencies - appears to reduce contrast - and is often used to remove high frequency nose.






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






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






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






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