Test your basic knowledge |

Digital Image Processing

Subject : engineering
Instructions:
  • Answer 50 questions in 15 minutes.
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  • 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. Noise is ____ related to contrast.






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






3. The ____ is the heart of the computer while the ___ is the vessels.






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






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






6. 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.






7. What are the two most common output devices?






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






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






10. What does DICOM stand for?






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






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






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






14. Computers operate from ____ ____ language.






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






16. A larger matrix provides ____ pixels.






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






18. Which memory can only be extracted without alteration; cannot change?






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






20. When was ENIAC invented?






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






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






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






24. 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?






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






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






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






28. What is the digital standard for imaging that is designed to ensure that all equipment fro all manufacturers who choose to adhere to the standard are speaking the same computer language?






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






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






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






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






33. ____ circuits permit simultaneous transmission of information while ____ circuits transmit sequentially.






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






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






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






37. What are the two ways detectors acquire information?






38. A low contrast image has a ___ frequency.






39. A larger matrix provides ____ pixels.






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






41. What is the name for a binary digit?






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






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






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






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






46. 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.






47. Which memory can only be extracted without alteration; cannot change?






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






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






50. What was the earliest computer device called?







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