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. What was the earliest computer device called?






2. Increased noise = _____ image contrast.






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






4. Which memory replaces new information with the old; can change?






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






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






7. Computerized digital images are described in terms of what






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






9. Window width and contrast have an ____ relationship.






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






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






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






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






14. 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.






15. 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?






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






17. 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.






18. 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?






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






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






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






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






23. Fluoroscopic noise mostly comes from what?






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






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






26. What provides specific instructions for calculations and sequential steps to be followed?






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






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






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






30. When was ENIAC invented?






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






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






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






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






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






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






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






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






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






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






41. What are the two types of information computers use?






42. Noise is measured as what?






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






44. What are the two ways detectors acquire information?






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






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






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






48. What can memory be transferred as?






49. A larger matrix provides ____ pixels.






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







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