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. Which type of information consists of operating instructions?






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






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






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






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






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






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






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






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






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






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






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






13. 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.






14. When was ENIAC invented?






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






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






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






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






19. 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.






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






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






22. What is high-pass filtering also called?






23. Fluoroscopic noise mostly comes from what?






24. Fluoroscopic noise mostly comes from what?






25. 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.






26. What are the two most common output devices?






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






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






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






30. Computer programs are called what?






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






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






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






34. What is required for collection of input information?






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






36. A high contrast image has a ___ frequency.






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






38. What is high-pass filtering also called?






39. What is a square series of boxes that gives form to the image?






40. Extremely narrow window width requires the computer to ignore a ___ ____ of data outside the chosen range.






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






42. Computerized digital images are described in terms of what






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






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






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






46. Binary systems operate with a ___-symbol language.






47. Resolution is controlled by what?






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






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






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