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. What is an individual matrix box or picture element?






2. 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?






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






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






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






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






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






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






9. What can memory be transferred as?






10. Computerized digital images are described in terms of what






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






12. What is high-pass filtering also called?






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






14. What are devices such as keyboard - touch screen monitors - and voice-activation that you put into or connect to a computer?






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






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






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






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






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






20. What determines resolution?






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






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






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






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






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






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






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






28. What determines resolution?






29. The _____ the matrix size - the better the resolution.






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






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






32. What is high-pass filtering also called?






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






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






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






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






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






38. What does DICOM stand for?






39. 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?






40. Scanners - mouse - keyboard - input memory disk drive - and paper printers are all forms of what?






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






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






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






44. Which type of information consists of operating instructions?






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






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






47. What are devices such as keyboard - touch screen monitors - and voice-activation that you put into or connect to a computer?






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






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






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