Machine QA -- StarTrack based LINAC QA

Watch the presentation of Anna Arns, University Hospital Mannheim, Clinic for Radiotherapy and Radiooncology, Mannheim, Germany, speaking at the IBA Symposium held at the ESTRO Congress 2013

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Do you measure your monthlyQa in water phantom ? How you calibrated the if ur measurements outside tolerable do you depend the matrixx or water phantom with absolute measurements?