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. A high contrast image has a ___ frequency.






2. In what time period did microchip technology come out?






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






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






5. What is high-pass filtering also called?






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






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






8. 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.






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






10. 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?






11. A larger matrix provides ____ pixels.






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






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






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






15. Fluoroscopic noise mostly comes from what?






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






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






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






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






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






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






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






23. 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.






24. What does DICOM stand for?






25. What is required for collection of input information?






26. 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?






27. ____ circuits permit simultaneous transmission of information while ____ circuits transmit sequentially.






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






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






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






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






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






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






34. What are the two ways detectors acquire information?






35. What is the name for a binary digit?






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






37. What does DICOM stand for?






38. A low contrast image has a ___ frequency.






39. What is the name for a binary digit?






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






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






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






43. Computers operate from ____ ____ language.






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






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






46. 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.






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






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






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






50. Computerized digital images are described in terms of what