RADT 100 questions and answers

RADT 100 questions and answers RADT 100 questions and answers 1. Digital imaging techniques can be used in: all answers listed 2. Mammography is radiographic imaging of the: breast 3. SELECT TWO: Digital imaging could only be developed after advances were made in: 1. microprocessors 2. semiconductor memory 4. Which of the following modulation requires the best spatial resolution?: - mammography 5. As spatial resolution increases, lp/mm .: increases 6. The dynamic range determines the degree of in the image.: con- trast resolution 7. Digital fluoroscopy uses at least monitor(s): 2 8. A principal advantage of digital fluoroscopy is: image subtraction 9. Digital fluoroscopy systems with hybrid capabilities use both: temporal and energy subtraction 10. T/F: Digital fluoroscopic dose rate is lower than that for continuous analog fluoroscopy: true 11. SELECT 3: Further imaging workup of breast cancer can include?: 1. ultrasound 2. tomosynthesis 3. MRI 12. Recent studies have shown that 50% of breast cancers will occur in the: upper outer quadrant 13. Approximately of breast cancer is DCIS?: 80% 14. Soft tissue radiography requires special techniques because of the low .: subject contrast 15. When doing soft tissue radiography, the differential absorption between and must be enhanced.: glandular, fat 16. DQE is: detective quantum efficiency 17. In soft tissue radiography, such as mammography, all of the tissues being imaged have similar: all listed are similar 18. The breast tissue tends to be increasingly in older women.: fatty 19. Breast compression increases .: spatial resolution 20. resolution is defined as the ability to image 2 separate objects and visually detect one from the other: spatial 21. DCIS appears on a mammogram as .: microcalcifications 22. Which imaging modality was first to use computerized (the aid of comput- er) image production?: CT 23. Which pitch setting would give the patient the highest radiation dose, assuming all other factor remain the same?: 0.5 24. The degree of spatial resolution in any imaging system is limited to the size of the : pixel 25. PET stands for: positron emission tomography 26. SELECT 3: Hybrid imaging can include?: 1. computed tomography 2. magnetic resonance 3. nuclear medicine 27. Which modality is primarily used to image physiological function?: nuclear medicine 28. Which imaging modality has the highest specificity of detecting breast cancer?: MRI 29. SELECT 2: What is the primary function of fluoroscopy?: 1. real time imaging 2. motion studies 30. A Radiographer (RT) needs to move the fluoroscopy table from horizontal to vertical for the next part of the exam. The RT's dose at 4 feet was 2 mGy per hour, what is the new dose rate at 1 foot?: 8 mGy/hr 31. What is the major source of radiation exposure to personnel (employees) assisting during a fluoroscopy procedure?: x ray beam collimator 32. What aspect of image quality will be affected the most by image noise?: - spatial resolution 33. An imaging system bit depth determines what aspect of image quality?: - contrast resolution 34. The principal source of noise in computed radiography is .: scatter radiation 35. The computed radiography has .: improved contrast resolution 36. The represents zero or one.: bit 37. What is the form of radiology that allows for the transfer of images to remote sites for interpretation?: teleradiology 38. In digital radiography, the latent image is formed on the .: imaging detector 39. In digital radiography, spatial resolution is improved with increased .- : matrix size 40. The 2 principal characteristics of a medical images are .: spatial resolution and contrast resolution 41. Spatial frequency is used to describe the quality of spatial resolution in terms of .: line pair 42. If there were such thing as a perfect imaging system, the MTF would be equal to .: 1 43. The portion of useful image-forming x-rays is referred to as the .: - signal 44. If an image receptor has a high probability of capturing the x-ray beam, then it has a high .: DQE 45. The principal drawback of the first-generation CT scanner was the .: - long scanning time 46. Many CT x-ray tubes have the capacity for millions of with each exam.: heat units 47. CT imaging has excellent because of the narrow beam collimation.: contrast resolution