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






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






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






4. Fluoroscopic noise mostly comes from what?






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






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






7. Noise is measured as what?






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






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






10. Commercial units scan only 262.5 lines out of 525 in each pass thus producing ____ for diagnostic imaging.






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






12. Computerized digital images are described in terms of what






13. What are the two most common output devices?






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






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






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






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






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






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






20. A low contrast image has a ___ frequency.






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






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






23. A larger matrix provides ____ pixels.






24. What is the name for a binary digit?






25. All medical imaging is achieved with which type of computers?






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






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






28. What is critical to how fast the computer system can function?






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






30. Increased noise = _____ image contrast.






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






32. 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.






33. Computer equipment is called what?






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






35. A high contrast image has a ___ frequency.






36. What type of memory storage device is inexpensive and the data is stored serially (difficult to access)?






37. Resolution is controlled by what?






38. What are the 3 classifications of digitized image filters?






39. Noise is ____ related to contrast.






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






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






42. What modalities are array processors useful for?






43. Computers operate from ____ ____ language.






44. What is required for collection of input information?






45. Commercial units scan only 262.5 lines out of 525 in each pass thus producing ____ for diagnostic imaging.






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






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






48. Window width and contrast have an ____ relationship.






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






50. What can memory be transferred as?