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






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






3. What modalities are array processors useful for?






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






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






6. Increased noise = _____ image contrast.






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






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






9. What modalities are array processors useful for?






10. A low contrast image has a ___ frequency.






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






12. When was ENIAC invented?






13. 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?






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






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






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






17. Noise is ____ related to contrast.






18. Noise is measured as what?






19. What does DICOM stand for?






20. Resolution is controlled by what?






21. Computerized digital images are described in terms of what






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






23. What determines resolution?






24. Which type of information consists of operating instructions?






25. What is the 'random-access' memory that usually functions as temporary storage for programming and operating instructions during use and is constantly changed/?






26. What is high-pass filtering also called?






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






28. The computer either ____ or ____ selected frequencies during the filtering process.






29. A larger matrix provides ____ pixels.






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






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






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






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






34. What changes the pixel value by multiplication or division and controls image contrast?






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






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






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






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






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






40. What can memory be transferred as?






41. Computer equipment is called what?






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






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






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






45. What is required for collection of input information?






46. What are the two most common output devices?






47. What is the name for an 8-bit word?






48. 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.






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






50. 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.