VMAT patient QA

Use your portal imager as absolute dosimeter to verify VMAT plans following these steps:

• Replace patient 3D model with water phantom and reset gantry angles to zero for dose calculation
• Calculate verification plan using YOUR CLINICAL dose calculation algorithm
• DICOM export dose plane at d_max as a reference matrix
• Deliver the VMAT plan normal way while acquiring integrated image
• Compare calculated versus acquired dose matrices using Epiqa

Benefits of using Epiqa for VMAT plan QA:

• Simple QA plan preparation
• Instant detector preparation for measurement – just deploy portal imager arm
• Easy QA plan delivery – can be performed by therapist
• Fast data export – export only 4 DICOM objects
• Quick results evaluation. In just few minutes user can print final protocol for approval
• The method verifies not just the delivery device but also TPS performance
• Supports also FFF-VMAT plans (more about FFF beams)
  

Example of evaluation of RapidArc plan using FFF beam (18 Gy/fraction, 10 MV FFF, 2400 MU/min):

Related references:

Using EPIQA for the verification of FFF-RapidArc Plans on the TrueBeam

Fredh A. et.al: Patient QA systems for rotational radiation therapy: A comparative experimental study with intentional errors, Med. Phys. 40, 031716 (2013)

White paper: Hrbacek J.: Verification of RapidArc^® plan using Epiqa^TM

Last update on 13. February 2018