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






2. What is the system of conductors that connects the various components of a computer system and permits the CPU to accept inputs from any point along the conductor?






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






4. Which type of information consists of operating instructions?






5. 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.






6. What determines resolution?






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






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






9. What is high-pass filtering also called?






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






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






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






13. What determines resolution?






14. What is a specialized computer that functions as a peripheral and uses CPU memory to perform mathematical operations at extremely high speed?






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






16. Increased noise = _____ image contrast.






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






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






19. A high contrast image has a ___ frequency.






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






21. 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.






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






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






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






25. 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?






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






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






28. Fluoroscopic noise mostly comes from what?






29. A low contrast image has a ___ frequency.






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






31. Fluoroscopic noise mostly comes from what?






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






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






34. When was ENIAC invented?






35. What is the 'noisiest' component of a digital system?






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






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






38. Window width and contrast have an ____ relationship.






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






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






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






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






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






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






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






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






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






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






49. What does DICOM stand for?






50. What is high-pass filtering also called?