VMAT SX1

Rx: 30Gy/12fx to Brain, 51Gy to metastases (simultaneous integrated boost)

2015 AAMD/Sun Nuclear Plan Challenge

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< 3 min VMAT treatment arc delivery time (estimated)

Beams
DHV
Simple DVH Metrics

Name (ID): AAMD2015, HCSWB_SIB (AAMD2015)
Plan or PlanSum ID: HCSWB_SIB4a

Structure ID Structure Code Patient Structure DVH Objective Evaluator Variation Priority Met Achieved
GTV_TOTAL_MET   GTV_Total_Met D99.0%[Gy] >=50 48   Goal 51.765 Gy
PTV_TOTAL_MET   PTV_Total_Met D98.0%[Gy] >=49 46   Goal 51.310 Gy
PTV_TOTAL_MET   PTV_Total_Met D2.0%[Gy] <=55 57   Variation 55.160 Gy
PTV_TOTAL_MET   PTV_Total_Met V51.0Gy[%] >=95 90   Goal 99.21 %
PTV_WB   PTV_WB D98.0%[Gy] >=27 25   Goal 27.993 Gy
PTV_WB   PTV_WB D2.0%[Gy] <=37.5 40   Variation 38.784 Gy
PTV_WB   PTV_WB V30.0Gy[%] >=93 90   Goal 94.45 %
HIPPOCAMPUS_TOTL   Hippocampus_Totl D0.03cc[Gy] <=16 30   Goal 15.879 Gy
HIPPOCAMPUS_TOTL   Hippocampus_Totl Mean[Gy] <=12 20   Goal 11.634 Gy
HIPPOCAMPUS_TOTL   Hippocampus_Totl Min[Gy] <=9 15   Goal 8.757 Gy
CHIASM   Chiasm D0.03cc[Gy] <=31 37.5   Goal 30.650 Gy
BRAINSTEM   Brainstem D0.03cc[Gy] <=33 37.5   Goal 32.649 Gy
CORD   Cord D0.03cc[Gy] <=25 37.5   Goal 24.292 Gy
LEYE   Leye Mean[Gy] <=6 15   Variation 6.695 Gy
REYE   Reye Mean[Gy] <=6 15   Variation 6.801 Gy
LLACRIMAL   LLacrimal Mean[Gy] <=10 20   Goal 9.853 Gy
RLACRIMAL   RLacrimal Mean[Gy] <=10 20   Goal 8.869 Gy
LLENS   LLens D0.03cc[Gy] <=4 10   Goal 3.713 Gy
RLENS   RLens D0.03cc[Gy] <=4 10   Goal 3.781 Gy
LOPTIC   Loptic D0.03cc[Gy] <=30 37.5   Goal 29.545 Gy
ROPTIC   Roptic D0.03cc[Gy] <=30 37.5   Goal 29.587 Gy
Technical Plan Comments

Four (4) arc VMAT technique was chosen and 4 almost complete arcs were used.  Each arc used a different start and stop angle (offset by 1 degree) to stagger the available control points throughout each arc rotation and unique collimator rotations per field were automatically generated utilizing the arc geometry tool. 

 

The plan challenge plan quality metric grading criteria was designed expecting the use a non-coplanar  arc arrangement with a vertex arc, but this beam arrangement proved not to be critical as the resulting coplanar plan created here scored higher than 80% of the cases submitted in this year’s challenge  The resulting plan suffers a bit in the homogeneity criteria mainly as a result of a less sharp dose gradient around the metastases, likely due to being limited to a coplanar arc arrangement. 

Comparative Plan Quality
Links

3rd party software plan report

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DICOM patient export         

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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.
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