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.
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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. Electrical connections between the CPU and the other components rung along a system of series or parallel conductors called what?






2. 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?






3. Computerized digital images are described in terms of what






4. Resolution is controlled by what?






5. What is the name for a binary digit?






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






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






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






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






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






11. When detectors acquire their information through ____ they are receiving all the info at once.






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






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






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






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






16. A high contrast image has a ___ frequency.






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






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






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






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






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






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






23. 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?






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






25. What modalities are array processors useful for?






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






27. 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?






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






29. What was the earliest computer device called?






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






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






32. Density and contrast of the digital image are controlled by varying the ____ ____ of each pixel.






33. A larger matrix provides ____ pixels.






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






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






36. 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.






37. A low contrast image has a ___ frequency.






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






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






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






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






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






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






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






45. What modalities are array processors useful for?






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






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






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






49. The quality of the data acquired from the IR is measured by what three data characteristics?






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







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