Positioning is the single biggest controllable variable in radiographic image quality. Five small habits in the procedure room reduce repeat exposures, improve diagnostic accuracy and shorten study times.
1. Centre on the anatomy, not the patient
The X-ray beam centre, the patient anatomy of interest and the detector centre must align. If you centre on the patient’s middle but the cardiac silhouette sits off-centre, the resulting film distorts the heart shadow. Decide what you are imaging before you position.
2. Use sandbags and positioning aids — don’t restrain by hand
Manual restraint introduces operator radiation exposure, motion blur and uneven positioning. Foam wedges, troughs and sandbags hold patients in true lateral or true VD position without anyone in the room. For aggressive or painful patients, consider mild sedation rather than manual hold.
3. Mark every image with R/L
Lead markers showing right or left should be in the primary beam — not added in post-processing. A misidentified side leads to wrong-site surgery or missed lateralised lesions. This is non-negotiable.
4. Pay attention to limb extension
For thoracic laterals, both forelimbs pulled cranially. For lateral abdomen, both pelvic limbs pulled caudally. The goal is to remove muscle and limb shadow from the region of interest. Cranial-only or caudal-only extension produces partially superimposed images.
5. Always check the technique before the next exposure
A wasted exposure is a wasted dose. Look at the previous image — adjust kVp, mAs and centring — then expose again. A two-second review prevents three retakes.
Bonus: training new staff
Document your positioning protocols with photos and post them in the procedure room. New technicians learn faster from a visual cheat sheet than from memory or hand-me-down notes.
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