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Digital Image Processing

Subject : engineering
Instructions:
  • Answer 50 questions in 15 minutes.
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  • Match each statement with the correct term.
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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. ____ circuits permit simultaneous transmission of information while ____ circuits transmit sequentially.






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






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






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






5. What is the name for a binary digit?






6. 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.






7. A high contrast image has a ___ frequency.






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






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






10. Noise is ____ related to contrast.






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






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






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






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






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






16. 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.






17. What are the two ways detectors acquire information?






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






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






20. What determines resolution?






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






22. What is high-pass filtering also called?






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






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






25. Increased noise = _____ image contrast.






26. What determines resolution?






27. What is the measure of the differences between the data values referred to as?






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






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






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






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






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






33. A low contrast image has a ___ frequency.






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






35. Fluoroscopic noise mostly comes from what?






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






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






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






39. 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?






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






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






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






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






44. What is the frequency response of the incoming signal called?






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






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






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






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






49. Who or What is responsible for density changes on a digital image? On a manual image






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







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