At 1.07 we see the whole throat, mandible and base of skull are included in the primary beam. This is not part of a lordotic AP chest unless it is specifically for airways. The demonstrated technique does not match the resultant radiograph. Angle the tube up if required. Collimate using the light beam diaphragm. Don't use centring points. The technique demonstrated for AP. chest on a trolley will produce a lordotic projection without any doubt. I have taken at least 1000 of these projections. To avoid the lordotic effect, get the patient to shrug their shoulders forward which brings the scapular off the lungfields and prevents the from pouting their chest to make the lordotic more likely
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