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. 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.






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






3. In what time period did mathematical theory and solid-state electronics come out?






4. Which type of information consists of collected facts?






5. What are the two ways detectors acquire information?






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






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






8. 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.






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






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






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






12. A larger matrix provides ____ pixels.






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






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






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






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






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






18. 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?






19. 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?






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






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






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






23. 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?






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






25. When detectors acquire their information by ____ they are receiving info from a specific area.






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






27. Window width and contrast have an ____ relationship.






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






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






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






31. 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.






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






33. What is the frequency response of the incoming signal called?






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






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






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






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






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






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






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






41. Computers operate from ____ ____ language.






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






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






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






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






46. A __ _____ disk will store over 10000000 bytes of information.






47. Increased noise = _____ image contrast.






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






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






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