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The daily setup using kV imaging. The alignment of metal wire under the patient's sternum (from his previous thorax surgery) on DRR and kV imaging was used for daily setup with a single LAO field. The metal wires are downstream from the beam beyond the target, so they are not affecting the dose distribution. Abbreviations: DRR, digitally reconstructed radiograph; kV, kilovoltage; LAO, left anterior oblique field.
