M103 T4 L9

Question 1

How is the cardiothoracic ratio calculated?

Answer 1

cardiac width / thoracic width

C / T < 0.5

Question 2

What are the advs of using a CT scan for looking at the lungs?

Answer 2

shows greater detail
resolves smaller structures
resolves small differences in attenuation

Question 3

What are the advs of using a CT scan for looking at the lungs?

Answer 3

cross sectional
spatial resolution
widely available

Question 4

What are the disadvs of using a CT scan for looking at the lungs?

Answer 4

ionising radiation

limited soft tissue contrast

Question 5

What methods can be used to obtain a picture of the distribution of the ventilation in the lungs?

Answer 5

the patient will breathe in a radioactive gas / Talban particles in the air
can radio-label them with an isotope that decays
so can detect the distribution of where it goes

Question 6

What is the most commonly used radio-isotope for when looking at lung perfusion?

Answer 6

macroaggregated human serum albumen

Question 7

In what position is the patient when CT lung scans are taken?

Answer 7

lying on their back

Question 8

Why are CT lung scans are taken with the patient lying on their back?

Answer 8

will give an image based on a normal physiological distribution throughout the lungs of blood flow

Question 9

What are the two types of pneumothoraxes?

Answer 9

tension - most urgent

non tension