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VMAT1

Rx: 20GyPTV & 25GyGTV SIB single fx

2017 TROG / ProKnow Plan Study

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~18min VMAT treatment field delivery time (estimated)

Beams
DVH
Metrics

Name (ID): TROG2017, SBRTspine (SBRT_Spine), (De-identified for TROG)
Plan or PlanSum ID: P4_147.47fina

Structure ID Structure Code Patient Structure DVH Objective Evaluator Variation Priority Met Achieved
PTV   PTV D90%[Gy] >=20 16   Goal 20.091 Gy
GTV   GTV D99%[Gy] >=25 20   Goal 25.209 Gy
PTV   PTV D0%[Gy] >=25     Goal 27.739 Gy
PTV   PTV D0%[Gy] <28     Goal 27.739 Gy
Spinal cord PRV   Spinal Cord PRV D0.03cc[Gy] <=10 12   Goal 9.726 Gy
OESOPHAGUS   Oesophagus D0.03cc[Gy] <=12 15.4   Goal 11.836 Gy
SKIN   Skin D0.03cc[Gy] <=6 24   Goal 5.883 Gy
LIVER   Liver D700cc[Gy] <=0.25 15   Goal 0.102 Gy
WHOLE LUNG   Whole lung D1000cc[Gy] <=0 7.4   Variation 0.840 Gy
HEART   Heart D15cc[Gy] <=5 16   Variation 5.144 Gy
DESCENDING AORTA   Descending Aorta D4cc[Gy]         14.369 Gy
Technical Plan Comments

This VMAT plan consists of six (6) arcs with collimators spaced 30 degrees apart (300, 330, 0, 30, 60, 90).  Due to the large fraction size, additional arcs have minimal to no impact on treatment deliver time for this case.  An optimization PTV was created to account for the desired dose gradient surrounding the spinal canal and the max dose constraint to the esophagus.  While this plan wasn’t submitted to this plan study, this plan’s achieved score is better than 90% of the plans that were submitted.

Comparative Plan Quality
Links

Review 3rd party software generated full treatment plan report

PDF

                              

Download full DICOM CT, struct, plan and dose file         

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Any reference to a "plan study" are simply what the organizers call each case and may not be a "study" in the FDA sense as they may not have been published in a peer reviewed journal.
Varian does not provide medical advice and these are illustrative examples only.
Leading plans by expert planner. Your results may vary.

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