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 an individual matrix box or picture element?






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






3. Resolution is controlled by what?






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






5. 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.






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






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






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






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






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






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






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






13. Which type of filter amplifies or deletes all but a selected range or band of frequencies and is useful in the elimination of characteristic emission peaks?






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






15. What modalities are array processors useful for?






16. Scanners - mouse - keyboard - input memory disk drive - and paper printers are all forms of what?






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






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






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






20. What is the system of conductors that connects the various components of a computer system and permits the CPU to accept inputs from any point along the conductor?






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






22. In what time period did microchip technology come out?






23. What is a specialized computer that functions as a peripheral and uses CPU memory to perform mathematical operations at extremely high speed?






24. Which type of information consists of operating instructions?






25. What was the earliest computer device called?






26. What is required for collection of input information?






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. A low contrast image has a ___ frequency.






29. Digitalization of analog information (increases / reduces) the quality and quantity of information?






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






31. What are the two most common output devices?






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






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






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






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






36. What determines resolution?






37. When was ENIAC invented?






38. What modalities are array processors useful for?






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






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






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






42. Fluoroscopic noise mostly comes from what?






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






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






45. What are the two most common output devices?






46. Computerized digital images are described in terms of what






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






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






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






50. Which type of information consists of collected facts?