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






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






3. 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.






4. Fluoroscopic noise mostly comes from what?






5. A low contrast image has a ___ frequency.






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






7. What permit input/output of information to or from the CPU?






8. 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?






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






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






11. Noise is measured as what?






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






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






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






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






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






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






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






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






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






21. A low contrast image has a ___ frequency.






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






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






24. What is the raw data to which a Fourier Transformation is applied to create the digital image?






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






26. 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?






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






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






29. Computers operate from ____ ____ language.






30. What 3 things were required prior to digital computer applications in medical imaging?






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






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






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






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






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






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






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






38. What is the system of conductors that connects the various components of a computer system and permits the CPU to accept inputs from any point along the conductor?






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






40. When was ENIAC invented?






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






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






43. What is required for collection of input information?






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






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






46. What was the earliest computer device called?






47. Noise is ____ related to contrast.






48. What determines resolution?






49. What is the equation for determining gray scale bit depth?






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







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