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 frequency response of the incoming signal called?






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






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






4. What determines resolution?






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






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






7. Window width and contrast have an ____ relationship.






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






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






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






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






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






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






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






15. A low contrast image has a ___ frequency.






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






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






18. Computer equipment is called what?






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






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






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






22. Computer programs are called what?






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






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






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






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






27. 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?






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






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






30. What is the random background information that does not contribute to the image quality?






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






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






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






34. What is the digital standard for imaging that is designed to ensure that all equipment fro all manufacturers who choose to adhere to the standard are speaking the same computer language?






35. A low contrast image has a ___ frequency.






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






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






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






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






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






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






42. A high contrast image has a ___ frequency.






43. Binary systems operate with a ___-symbol language.






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






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






46. 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?






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






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






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






50. When was ENIAC invented?