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






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






3. Resolution is controlled by what?






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






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






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






7. A larger matrix provides ____ pixels.






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






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






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






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






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






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






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






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






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






17. Computers operate from ____ ____ language.






18. Computers operate from ____ ____ language.






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






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






21. 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?






22. 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?






23. The human visual range is ___ or fewer shades of gray.






24. What are the two ways detectors acquire information?






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






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






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






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






29. What is required for collection of input information?






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






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






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






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






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






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






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






37. 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.






38. 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.






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






40. A low contrast image has a ___ frequency.






41. What is the primary limitation with the resolution on digital images?






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






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






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






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






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






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






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






49. What are devices that process information?






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