Radiology Flashcards
1
Q
Describe X-rays
A
- Body is irradiated onto a radiosensitive surface
- An image digitally produced
- Dependent on tissue density
- Useful for studying normal, injured or diseased bones, joints, skull, chest and abdomen
- Angiography used to study blood vessels, barium swallows and enemas for the gut
2
Q
Describe CT scans
A
- Computerised-axial tomagraphy
- Computer to analyse and enhance x-ray images to produce a composite image
- Contrast enhancing medium may also be used
- Useful for detecting bone fractures and acute bleeding
- Image is always viewed as looking up from patient’s feet
3
Q
Describe MRI scan
A
- Magnetic resonance imaging
- Directs magnetic fields through body
- Useful for showing subtle detail in soft tissue such as the brain (not good for bone)
- Technique involves administered isotopes so function of various organs can be strudied using iodine or xenon gas
4
Q
Describe ultrasound
A
- Useful for examining organ structure and early pregnancy
5
Q
Define ultramicroscopic
A
Can only be seen through an electron microscope (transmission and scanning)
6
Q
What are the two different stains used in light microscopy?
A
Haemotoxylin and eosin
7
Q
What is haemotoxylin?
A
- A basic dye with positive charge that binds to acidic or negatively charged structure, e.g. DNA and RNA which stains them dark/purple
8
Q
What is eosin?
A
- An acidic dye with negative charge that binds to basic or positively charged components of tissue staining them red
9
Q
What are the three micro-anatomical planes?
A
- Longitudinal section
- Cross section
- Oblique section
