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 are the two most common output devices?






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






3. A low contrast image has a ___ frequency.






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






5. What was the earliest computer device called?






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






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






8. It is important that the radiographer understand anatomy from different perspectives due to the methods of digital processing and image information? What are the 3 perspectives?






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






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






11. Window width and contrast have an ____ relationship.






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






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






14. Which memory replaces new information with the old; can change?






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






16. The number of shades of gray is determined by what?






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






18. What modalities are array processors useful for?






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






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






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






22. What is the random background information that does not contribute to the image quality?






23. What type of memory storage devices are required for large amounts of data?






24. 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.






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






26. Fluoroscopic noise mostly comes from what?






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






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






29. A low contrast image has a ___ frequency.






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






31. Computers operate from ____ ____ language.






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






33. Which memory replaces new information with the old; can change?






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






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






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






37. Increased noise = _____ image contrast.






38. Noise is ____ related to contrast.






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






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






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






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






43. What is high-pass filtering also called?






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






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






46. A high contrast image has a ___ frequency.






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






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






49. What are the two ways detectors acquire information?






50. A larger matrix provides ____ pixels.