13.6- Anatomy, Imaging the abdomen Flashcards
1
Q
What factors do the absorption X-rays in tissues depend on (3)?
A
Thickness of tissue
Density of tissue
Atomic no. of tissue^4
2
Q
Why does bone show up as white on an x-ray?
A
High atomic number of calcium
3
Q
What can we use to visualise e.g. the GI tract?
A
Barium (atomic no. 56)
4
Q
What do we use as an intravascular contrast medium?
A
Iodine (atomic no. 53)
5
Q
What do we use radioisotope imaging for?
What do they emit?
A
Biliary imaging (functional imaging modality) Emit gamma rays
6
Q
What does a Doppler ultrasound detect and note (2)?
How does the Doppler effect work?
A
Detect blood flow, notes direction and speed.
Works via perceived change in wave frequency
7
Q
Which diagnostic radiology investigations emit ionising radiation (3)?
Which don’t (2)?
A
Ionising:
X-rays, Gamma rays, PET
Non-ionising:
Ultrasound, MRI
