Imaging Flashcards
1
Q
What are the pros and cons of X-rays?
A
X-rays
- Uses form of electromagnetic radiation, short wave-length, high energy
- Absorbed in diff amounts in body
- More dense tissue - bone, absorb more radiation will be white
- Less dense tissue - soft tissue, absorb less radiation ,will be darker
- 2D image
Pros:
- Quick
- Dye (barium) can be ingested to increase contrast
Cons:
- Radiation
Used for fractures, fluid in lungs, joint space
2
Q
Pros and cons of CT
A
X-rays from different angles to produce cross-sectional
Pros:
- Detailed image
- Non-invasive
Cons:
- Risk allergy to dye
- Radiation
Good for soft tissues - liver, brain, abdominal organs
3
Q
Pros and cons MRI
A
- Magnetic waves align protons of hydrogen and radiowaves knock them out of alignment, which produces a signal which is detected
- Produce cross-sectional image
Pros:
- Detailed image, high resolution
- No radiation
Cons:
- Claustrophobic
- Not suitable for people with metal - pacemakers
Suitable for brain, joints, bones
4
Q
Pros and cons ultrasound
A
- Ultrasound probe produces high frequency sound waves.
- Bounce off different parts of body - producing echoes which is picked up by probe
Pros:
- Inexpensive
- Portable
- No radiation
Cons:
- Cannot be used in structures containing gas - lungs
- Not detailed
Suitable for heart, fetus
