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 the 'read-only' memory that contains basic operating instructions that are almost never changing?






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






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






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






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






6. Computerized digital images are described in terms of what






7. What are devices that process information?






8. 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.






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






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






11. Fluoroscopic noise mostly comes from what?






12. The number of shades of gray is determined by what?






13. What is the name for a binary digit?






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






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






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






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






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






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






20. A larger matrix provides ____ pixels.






21. What are the two most common output devices?






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






23. What is the 'read-only' memory that contains basic operating instructions that are almost never changing?






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






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






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






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






28. 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?






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






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






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






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






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






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






35. What is required for collection of input information?






36. DICOM imaging now includes compatibility via a database system that includes linage of the patient images with the patient's EMR. This database system is called what?






37. A high S/N indicates ___ noise in the image.






38. What are devices that process information?






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






40. What is the name for a binary digit?






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






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






43. What does DICOM stand for?






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






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






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






47. A high contrast image has a ___ frequency.






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






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






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