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. Fluoroscopic noise mostly comes from what?






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






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






4. A larger matrix provides ____ pixels.






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






6. A high contrast image has a ___ frequency.






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






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






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






10. What is required for collection of input information?






11. Computers operate from ____ ____ language.






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






13. What is high-pass filtering also called?






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






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






16. 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.






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






18. Scanners - mouse - keyboard - input memory disk drive - and paper printers are all forms of what?






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






20. What modalities are array processors useful for?






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






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






23. Computer equipment is called what?






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






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






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






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






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






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






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






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






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






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






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






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






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






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






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






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






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






41. Scanners - mouse - keyboard - input memory disk drive - and paper printers are all forms of what?






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






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






44. Which type of information consists of collected facts?






45. Noise is measured as what?






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






47. A low contrast image has a ___ frequency.






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






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






50. What are the two ways detectors acquire information?