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






3. A larger matrix provides ____ pixels.






4. 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.






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






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






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






8. What does DICOM stand for?






9. A high contrast image has a ___ frequency.






10. A larger matrix provides ____ pixels.






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






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






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






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






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






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






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






18. What are devices that process information?






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






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






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






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






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






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






25. Digitalization of analog information (increases / reduces) the quality and quantity of information?






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






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






28. When was ENIAC invented?






29. 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.






30. What modalities are array processors useful for?






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






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






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






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






35. Computerized digital images are described in terms of what






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






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






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






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






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






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






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






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






44. Around what time did digital computerization come out for CT and US?






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






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






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






48. What can memory be transferred as?






49. Digitalization of analog information (increases / reduces) the quality and quantity of information?






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