CT and MRI

1
CT and MRI
2
Computed Tomography

• 1972 __________________
• X-ray tube in a tube
• Rows of _________ opposite x-ray tube
• Produces ___________________

3
1st and 2nd Generation

• 1st generation
• _________
• Transmits beam then ________
• Long scan times

• 2nd generation
• _________
• Transmits a fan beam then _________
• Faster scanning

4
3rd and 4th Generation

• 3rd generation
• _____________
• More detectors

• 4th generation
• Detectors _____________
• Continuous rotating x-ray tube

5
Helical/Spiral scanning

• ______________technology
• Tube rotation ____________
• Pt movement continuous
• ______________of data
• Faster scanning

6
Hounsfield UnitsCT Numbers

• Can determine material based on the
  __________(linear attenuation coefficient)
• __________ 0
• Cortical bone 1000
• ________ -1000

7
Multi slice

• Obtaining multiple slices ____________
• Much faster scanning
• 4, 16, 32, 64 slice
• And More

8
Contrast

• IV _____________ same as X-ray
• __________ visualizes GI track
• ______ quicker visualization of Lower GI

9
MRI

• 1983 1st Installed MRI. 1946 discovered.
• Uses primarily
• ___________
• ________________
• Good anatomical detail

10
Magnet Types

• Resistive
• ____________
• ________________

11
MRI (Sort of)

• _______________
• Some ___________ in the magnet
• Magnetic moment
• Radiofrequency (RF)
• ______________
• Atoms ___________
• Computer recon image

12
T1 and T2 Weighted

• MRI visual contrast
• T1 ______________
• T2 ______________
• Unless its blood

13
MRI IV contrast

• Not like X-ray
• ___________
• Metallic based
• ________________than X-ray
• Until recently

14
Safety

• _________________________
• Carefully screen pt
• __________________