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






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






4. What is high-pass filtering also called?






5. 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.






6. Increased noise = _____ image contrast.






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






8. What are the two ways detectors acquire information?






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






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






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






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






13. What is an image that has been converted into numerical values for transmission or processing?






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






15. Which type of information consists of operating instructions?






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






17. Resolution is controlled by what?






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






19. Computerized digital images are described in terms of what






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






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






22. 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.






23. What is required for collection of input information?






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






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






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






27. What modalities are array processors useful for?






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






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






30. Increased noise = _____ image contrast.






31. A __ _____ disk will store over 10000000 bytes of information.






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






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






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






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






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






37. What does DICOM stand for?






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






39. What type of memory storage devices are required for large amounts of data?






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






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






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






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






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






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






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






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






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






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






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







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