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






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






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






4. Noise is ____ related to contrast.






5. Because electrical currents are understood as being either on or off - the binary system consists of information recorded as either a _ for off or a _ for on.






6. 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?






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






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






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






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






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






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






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






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






15. What type of memory storage devices are required for large amounts of data?






16. When was ENIAC invented?






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






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






19. Noise is measured as what?






20. 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?






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






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






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






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






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






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






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






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






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






30. Window width and contrast have an ____ relationship.






31. What are the two most common output devices?






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






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






34. What does DICOM stand for?






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






36. What does DICOM stand for?






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






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






39. What is required for collection of input information?






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






41. A high contrast image has a ___ frequency.






42. What is high-pass filtering also called?






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






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






45. 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?






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






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






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






49. Computer equipment is called what?






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