Siemens completed a technical investigation of the reported event; however, it is not currently known why the 550 txt did not detect an error, resulting in opening the safety circuit and tripping the motion stop for the complete system.After recalibration, the 550 txt performed as expected and the issue has been resolved.Additional action is not warranted at this time.
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It was reported to siemens by the customer when the tabletop is set to isocenter, the treatment table display (550 txt) shows the vertical measurement as being 6 cm off, but no error on the treatment table or control console occurred.This event did not occur during patient treatment.There was no report of patient mistreatment or injury.Based on the fact that the primary setup is performed with lasers, and not only with vertical readout, a coordinate system error would be easily detected.However, in a worse-case scenario, an incorrect configuration of the 550 txt treatment table could result in a collision, which could lead to severe bodily injury to the patient.
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