Overview
The AP supine chest radiograph is used when patients cannot stand for upright imaging. The x ray beam passes from anterior to posterior with the patient lying on the table. Cardiac size may appear magnified compared with PA views.
Technique
Place the detector under the patient and center to the chest. Use appropriate exposure factors to penetrate the thorax in the supine position. Document patient position and limitations on the request form.
Clinical Indications
AP supine chest is indicated for critically ill or immobilized patients. It is commonly used in intensive care and emergency settings. Portable radiography enables timely assessment at the bedside.
Image Assessment
Interpretation accounts for projectional magnification and patient rotation. Evaluate for pneumothorax lines tubes and consolidation. Correlate with clinical status and consider follow up upright imaging when feasible.