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 computers handle data composed of definite quantities of current?






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






3. Noise is measured as what?






4. What does a 1 in binary code stand for?






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






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






7. What can memory be transferred as?






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






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






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






11. What are devices that process information?






12. What was the earliest computer device called?






13. 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?






14. What is the primary limitation with the resolution on digital images?






15. What are the two ways detectors acquire information?






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






17. There is a ___ relationship between subject contrast and acquired data contrast.






18. Which type of information consists of collected facts?






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






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






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






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






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






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






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






26. Computerized digital images are described in terms of what






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






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






29. What are devices that process information?






30. 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.






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






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






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






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






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






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






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






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






39. Resolution is controlled by what?






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






41. DICOM imaging now includes compatibility via a database system that includes linage of the patient images with the patient's EMR. This database system is called what?






42. When was ENIAC invented?






43. Because electrical currents are understood as being either on or off - the binary system consists of information recorded as either a _ for off or a _ for on.






44. 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.






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






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






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






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






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






50. What is required for collection of input information?