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VMAT

Rx: 20GyPTV & 25GyGTV SIB single fx

2017 TROG / ProKnow Plan Study

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~9min VMAT treatment field delivery time (estimated)

Beams
DVH
Metrics

Name (ID): TROG2017, SBRTspine (SBRT_Spine), (De-identified for TROG)
Plan or PlanSum ID: P6_HD_12IDA

Structure ID Structure Code Patient Structure DVH Objective Evaluator Variation Priority Met Achieved
PTV   PTV D90%[Gy] >=20 16   Goal 20.105 Gy
GTV   GTV D99%[Gy] >=25 20   Goal 25.113 Gy
PTV   PTV D0%[Gy] >=25     Goal 26.936 Gy
PTV   PTV D0%[Gy] <28     Goal 26.936 Gy
Spinal cord PRV   Spinal Cord PRV D0.03cc[Gy] <=10 12   Goal 8.825 Gy
OESOPHAGUS   Oesophagus D0.03cc[Gy] <=12 15.4   Goal 11.295 Gy
SKIN   Skin D0.03cc[Gy] <=6 24   Goal 5.617 Gy
LIVER   Liver D700cc[Gy] <=0.25 15   Goal 0.073 Gy
WHOLE LUNG   Whole lung D1000cc[Gy] <=0 7.4   Variation 0.566 Gy
HEART   Heart D15cc[Gy] <=5 16   Goal 4.936 Gy
DESCENDING AORTA   Descending Aorta D4cc[Gy]         12.922 Gy
Technical Plan Comments

This VMAT plan consists of five (5) arcs with collimators spaced 30 degrees apart (300, 330 -skipping 0- 30, 60, 90).  Due to the large fraction size, additional arcs have minimal to no impact on treatment delivery 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.  This plan was submitted for this plan study and was 4th overall.  The highest scoring plan (also on HDMLC) used controversial 90degree couch with anterior arcs and scored .3 points higher.

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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