Survey Radiologic Technologist

Card Set Information

Survey Radiologic Technologist
2012-03-07 18:53:41
Fluroscopy Surgery CT MRI

Chapter 4 & 6
Show Answers:

  1. What is fluoroscopy?
    Fluroscopy is that part of radiology where x-rays are used to image inner parts of the body motion (dynamically).
  2. What are some parts of the body that move as they function?
    Digestive system, circulatory system, urinary system, and pulmonary system are made of soft tissue structures that move as they function.
  3. How does imaging patterns is movement help?
    Aids in making a diagnosis.
  4. What else does fluoroscopy also provides a means of guidance?
    Fluoroscopy also provides a means of guidance for moving the patient into proper position for imaging, as well as when manipulating diagnostic aids such as needles, catheters and contrast material.
  5. How did early fluoroscopy work?
    An x-ray tube generated the x-rays which were directed at the patient. A fluoroscopic screen (glass coated with zinc-cadium sulfide) was place on the other side of the patient.
  6. What are the two types of cells, in the eye, that react to light?
    The rods, and the cones.
  7. How do cones cells function?
    Cones are less sensitive to dim light, but are capable of respnding to more intense light. Cones are also better at perceiving fine detail and respond to different colors of light.
  8. How do rod cells function?
    Rods are essentially color-blind. Typically, the light on the fluoroscopic screen only activated the rods. The only way to make it brighter was to expose the patient and the operators to a higher level radiation.
  9. When was the image intensifier developed?
    In the 1950's
  10. What is the image intensifier coated at the end?
    The II is large vacuum tube which the end is coated with an input phospor.
  11. What is the function of the phospor?
    The phosphor glows when activated by x-ray photons.
  12. After phosphor, what is the next element in the image intensifier tube?
    The next element is the photocathode which is bonded to the input phosphor.
  13. Where does the electronic lenses focus the electrons onto?
    Electronic lenses focus the electrons onto the output phosphor.
  14. How much brighter is the image that appears on the output phosphor after gion gthrough the image intensification process?
    The image that apperas on the output phosphor after going through the image intensification process if from 5,000 to 20,000 times brighter than what appeared on the original fluoroscopy screen.
  15. What is the weak link in the current system?
    The weak link in this current (fluoroscopy) system is the resolution of the TV screen.
  16. What does x-ray sugery do in Surgery?
    Radiology's ability to see inside the body has proven to be useful in many types of procedures that are typically performed in surgery by surgeons who are not radiologists.
  17. What color are the sterile drapes in the operating room (OR)?
    Sterile drapes in the OR are blue. Never touch anything BLUE!!
  18. What does CT stand for?
    CT stands for Computerized Tomography. This modality uses x-rays to provide the energy from which the image are created.
  19. What is better for trauma?
    CT is better for trauma patients than MRI. CT is less expensive exam and can be performed faster. CT can also be used on patients who have metal implants in ther bodies or require metal devices for monitoring or life support. CT is also better for imaging bony structures.
  20. What does MRI stand for?
    MRI stands for Magnetic Resonance Imaging. This modality doe NOT use X-rays. Instead, energy from a very strong magnet and radio waves are used to change the direction of spin of Hydrogen atoms in the body. These images are superior especially for the soft tissues of the body.
  21. What are the disadvantages to MRI imaging?
    First, the length of timefor the exam. Secondly, the tunnel shaped machine is difficult for claustrophobic patients. Finally, people with ferro-magnetic metal implants or objects that may be affected by magnetism (such as pacemakers) cannot undergo MRI exams.
  22. What is the MRI magnet cooled by?
    The magnet is cooled by liquid nitrogen to enhance its magnetic field.