The PA wrist position: patient seated at the table with elbow flexed 90° and forearm pronated so the palm is down. Place the wrist flat on the image receptor with the long axis of the hand aligned to the detector; fingers relaxed or slightly flexed to reduce OID. Center the central ray perpendicular to the midcarpal area, include distal radius/ulna and proximal metacarpals, immobilize and collimate.

PA stands for posteroanterior. In a PA X‑ray the X‑ray beam travels from the patient’s back (posterior) to the front (anterior) while the chest faces the detector. This standard chest radiograph reduces cardiac magnification and provides an accurate view of lung fields and mediastinal structures, commonly used for routine chest imaging and follow‑up examinations.

An X‑ray for wrist pain can detect fractures (e.g., distal radius, scaphoid), bone alignment issues or dislocations, joint space narrowing and bony changes from arthritis, bone spurs, osteopenia/osteoporosis, and healed fracture malunions. It may also show gross bone tumors or advanced infection. X‑rays do not reliably show soft‑tissue injuries (ligaments, tendons, cartilage); MRI, CT, or ultrasound may be needed.

PA (posteroanterior): patient rests the palm flat on the detector, the beam travels from the back (dorsal/posterior) to the palm (anterior). This minimizes object-to-image distance, reducing magnification and better showing joint spaces—preferred for routine hand films. AP (anteroposterior): palm faces the tube, beam goes anterior→posterior; used when PA positioning isn’t possible but causes more magnification and altered joint relationships.

A PA (posteroanterior) chest X‑ray is a standard frontal radiograph used to evaluate the lungs, airways, heart size and chest wall. It helps detect pneumonia, tuberculosis, lung nodules or masses, pleural effusion and pneumothorax, and to check lines, tubes or follow‑up of chronic lung disease. The PA view reduces cardiac magnification and gives a more accurate assessment than an AP film.

Position the patient upright facing the detector with chest against it; ask them to roll shoulders forward and place hands on hips. Center the beam at T7 (mid‑thorax), perpendicular to the detector, include apices and costophrenic angles, and collimate to the chest. Instruct full inspiration and hold breath. Verify no rotation (clavicles symmetric) and adjust exposure for clear lung markings.