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 primary limitation with the resolution on digital images?






2. What is high-pass filtering also called?






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






4. 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.






5. What are devices that process information?






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






7. Noise is measured as what?






8. A larger matrix provides ____ pixels.






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






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






11. What is the name for a binary digit?






12. Resolution is controlled by what?






13. What does DICOM stand for?






14. What is required for collection of input information?






15. What is high-pass filtering also called?






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






17. 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?






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






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






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






21. Computer programs are called what?






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






23. Digital detectors are capable of producing ______ shades of gray.






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






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






26. What directs information to and from various parts of the computer?






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






28. What are devices that process information?






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






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






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






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






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






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






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






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






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






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






39. What is an image that has been converted into numerical values for transmission or processing?






40. 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?






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






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






43. Computer equipment is called what?






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






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






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






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






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






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






50. What can memory be transferred as?