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. What are devices that process information?






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 the random background information that does not contribute to the image quality?






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






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






6. 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.






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






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






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






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






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






12. What are the 3 classifications of digitized image filters?






13. What can memory be transferred as?






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






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






16. 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.






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






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






19. 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?






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






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






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






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






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






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






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






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






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






29. What are the 3 classifications of digitized image filters?






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






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






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






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






34. When was ENIAC invented?






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






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






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






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






39. What are devices such as keyboard - touch screen monitors - and voice-activation that you put into or connect to a computer?






40. Noise is ____ related to contrast.






41. What can memory be transferred as?






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






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






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






45. 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?






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






47. Noise is measured as what?






48. Which type of information consists of operating instructions?






49. Noise is ____ related to contrast.






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