Test your basic knowledge |

Digital Image Processing

Subject : engineering
Instructions:
  • Answer 50 questions in 15 minutes.
  • If you are not ready to take this test, you can study here.
  • Match each statement with the correct term.
  • Don't refresh. All questions and answers are randomly picked and ordered every time you load a test.

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






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






3. What is required for collection of input information?






4. Noise is measured as what?






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






7. What is the name for a binary digit?






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






9. What is the 'heart' of every computer?






10. Which type of filter amplifies or deletes all but the high frequencies - appears to increase contrast - and is useful in vascular imaging or digital mammo.






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






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






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






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






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






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






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






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






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






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






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






22. A high contrast image has a ___ frequency.






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






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






25. What modalities are array processors useful for?






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






27. 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?






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






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






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






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






32. A low contrast image has a ___ frequency.






33. 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?






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






35. What is the name for a binary digit?






36. What is the 'heart' of every computer?






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






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






39. Fluoroscopic noise mostly comes from what?






40. 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?






41. Window width and contrast have an ____ relationship.






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






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






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






45. What is critical to how fast the computer system can function?






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






47. Noise is ____ related to contrast.






48. What determines resolution?






49. What is high-pass filtering also called?






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






Can you answer 50 questions in 15 minutes?



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