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






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






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






4. Which computers handle data composed of definite quantities of current?






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






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






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






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






9. What are the two ways detectors acquire information?






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. What was the earliest computer device called?






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






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






14. Which type of information consists of operating instructions?






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






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






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






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






19. A low contrast image has a ___ frequency.






20. Extremely wide window width requires the computer to ignore ___ contrast differences in order to display the entire range of data.






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






22. What is the measure of the differences between the data values referred to as?






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






24. What modalities are array processors useful for?






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






26. 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?






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






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






29. 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?






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






31. Medical imaging is often achieved from information that has been processed by what?






32. Resolution is controlled by what?






33. 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.






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






35. Noise is measured as what?






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






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






38. What is high-pass filtering also called?






39. What are the two most common output devices?






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






41. What is the name of the 'modern electronic computer'?






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






43. 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?






44. Computer equipment is called what?






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






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






47. What does DICOM stand for?






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






49. 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.






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