Radiographic Localisation

Question 1

What is the need for radiographic localisation?

Answer 1

To determine location of a structure or pathological lesion in relation to other structures
Only needed where clinical examination is insufficient to provide answer

Question 2

What is the sequence to look at radiographs?

Answer 2

Observation - look and see
Interpretation - listen and think
Management - patient’s needs

Question 3

What are the methods of radiographic localisation?

Answer 3

Normally two views required
Views at right angles in their projection geometry
Views with any different projection, provided the difference is known

Question 4

What is a parallax?

Answer 4

An apparent change in the position of an object, caused by a real change in the position of the observer
Basically we change the position of the observer by changing the position of the tubehead