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. Resolution is controlled by what?






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






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






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






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






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






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






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






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






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






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






12. 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?






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






14. What modalities are array processors useful for?






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






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






17. 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.






18. What is the name for an 8-bit word?






19. A larger matrix provides ____ pixels.






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






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






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






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






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






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






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






27. When was ENIAC invented?






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






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






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






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






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






33. Computerized digital images are described in terms of what






34. 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?






35. What was the earliest computer device called?






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






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






38. What are the two types of information computers use?






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






40. What determines resolution?






41. Window width and contrast have an ____ relationship.






42. Which type of information consists of operating instructions?






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






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






45. In what time period did microchip technology come out?






46. What are the two most common output devices?






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






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






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






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