H2 updated.H6 updated.H10 updated.The investigation was completed by conducting a thorough evaluation of the product and the reported information.The customer reported a discrepancy between the treatment fields' parameters in mosaiq and the imported plans.Elekta used the same plan in-house provided by the customer to evaluate import processing and found that plan promotion works as expected.The parameter values (e.G., gantry, collimator, field size, etc.) in mosaiq matched those of the plan.Once promoted, the plan is in a pending state and values can be changed without version roll until the plan has been approved or treated.From the logs it was determined that changes by the user from the original plan occurred after the initial plan was imported and were accepted by the user.Based upon information available elekta physics have assessed that overall the patient received an underdose which is considered non-serious.The error led to an underdose of 50% to the intended region on two of four days of treatment.If this had been the only error the error in dose would be an underdose of 25%.This is expected to reduce the effectiveness of the treatment but is not expected to directly cause any significant health impact.The dose was not as intended on the other 2 days of treatment, however the dosimetric impact from the error in geometry on those days was smaller and does not further impact the assessment above.Mosaiq did not have any malfunction and worked as designed and intended.The issue was due to use error.
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