Benchmark FAQ for NRG BR001: A Phase Study of SBRT for...
Transcript of Benchmark FAQ for NRG BR001: A Phase Study of SBRT for...
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Benchmark & FAQ for NRG‐BR001: A Phase 1 Study of SBRT for the
Treatment of Multiple Metastases
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Credentialing Requirements(SECTION 5)
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3DCRT credentialing
SBRT credentialing
Separate isocenterfor each metastasis
Phantom irradiation with motion management:
Lung/Spine targets with SBRT using beams sharing a
single isocenter
Benchmark planning
IMRT credentialing
Facility Questionnaire
Phantom irradiation with step-and-shoot
or dynamic delivery
Phantom irradiation with 3D
conformal delivery
Single isocenterfor multiple metastases
Phantom irradiation with motion management:
Lung target with SBRT
IGRT credentialing
Lung or Liver SBRT case treated with motion management
Spine SBRT case
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Benchmark Planning
• Planning tool by which to familiarize each institution with the specific planning goals of the protocol
• Pre‐enrollment review versus pre‐treatment review
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NRG BR001: IROC Phantoms
• Institutions need to credential for only the most complex modality they intend to use! (3D IMRT VMAT)
• The following techniques must be included in credentialing prior to use in patients enrolled onto BR001:– Motion management technique– FFF beams
• Techniques may be combined – Ex: IMRT using FFF delivered with motion management
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NRG BR001: IROC SBRT PhantomsLung & Spine IrradiationLung
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NRG BR001: IGRT Credentialing
• Data from 2 anatomical sites:– Lung/Liver with same motion management technique your institution will utilize for BR001
– Spine
Insert screenshots of Duke credentialing
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Benchmark Planning
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BR001 Benchmark Case:Bilateral Adrenal Metastases
LT GTV & PTVRT GTV & PTV:Overlap with liver
Metastases Overlap with Parallel Organs
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BR001 Benchmark Case:Bilateral Adrenal Metastases
LT GTV & PTV:Overlap with Kidney
RT GTV & PTV
Metastases Overlap with Parallel Organs
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BR001 Benchmark Case:Bilateral Adrenal Metastases
LT GTV & PTV:Overlap with Stomach
Metastasis Overlap with Serial Organ
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NRG BR001: FAQ
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NRG BR001: FAQ
• Can my institution plan the benchmark with a single isocentereven though my institution has not yet credentialed to deliver treatment to 2 metastases using a single isocenter?– Yes
• What should I do if an OAR is not in the structure set?– Contour it if you would like to use it for planning
• What QA measurements are required?– None
• Should the benchmark plan be reviewed by our physician?– Absolutely! To ensure it’s clinically acceptable
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NRG BR001: FAQ
• If the plan is intended to treat both lesions simultaneously on the same day, am I required to submit separate dose grids for each lesion?– No (e.g., single VMAT plan)
• For an IMRT/VMATplan, is a normalization of 60‐90% required?– No, but ensure conformality is high
• How should the conformality of the plan be assessed?– See Table 6‐4– 80% isodose should break up between 2 lesions
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NRG BR001: FAQ• I cannot meet the PTV coverage requirements while also meeting
all the OAR constraints in Table 6‐6. How should these competing constraints be balanced?– BR001 provides guidance on the “planning priorities” (SECTION 6.4.5):
1. Spinal dose constraints, as assessed on the composite dose map, must always be met.
2. PTV coverage may not fall below 70% of the 45 Gy prescription dose in regions overlapping with OAR.
3. No dose >47.25Gy may exist outside PTV. In addition, no dose >47.25Gy may exist in PTV volumes that overlap directly with OAR (e.g., Liver, Kidney_L, Stomach, Bowel). See SECTIONS 6.4.3 & 6.5.4.
– It is left to the discretion of the institution as to whether they will prioritize PTV coverage over OAR (e.g., stomach) constraints.
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NRG BR001: Benchmark Evaluation
• How will the benchmark be evaluated?– Dose Volume Analysis (DVA) will be used to tabulate data– Composite dose will be used to evaluate all OAR constraints including
105% hotspot location– If each metastasis is planned for treatment on separate days,
individual dose maps will be evaluated for PTV coverage
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NRG BR001: Dose Volume Analysis (DVA) for Benchmark Evaluation
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Benchmark Examples & Reviews
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NRG BR001: Benchmark Case 1
Passed on 2nd Try.Passed on 2nd Try.
2 Isocenter Plan passed on 2nd Try.
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NRG BR001: Benchmark Case 1
Passed on 2nd Try.2 isocenters: passed on 2nd try.
120% = 54 Gy110% = 49.5 Gy105% = 47.25 Gy100% = 45 Gy95% = 42.75 Gy90% = 40.5 Gy80% = 36 Gy70% = 31.5 Gy50% = 22.5 Gy25% = 11.25 Gy
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NRG BR001: Benchmark Case 1
2 isocenters: passed on 2nd try.
120% = 54 Gy110% = 49.5 Gy105% = 47.25 Gy100% = 45 Gy95% = 42.75 Gy90% = 40.5 Gy80% = 36 Gy70% = 31.5 Gy50% = 22.5 Gy25% = 11.25 Gy
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NRG BR001: Benchmark Case 1
2 isocenters: passed on 2nd try.
120% = 54 Gy110% = 49.5 Gy105% = 47.25 Gy100% = 45 Gy95% = 42.75 Gy90% = 40.5 Gy80% = 36 Gy70% = 31.5 Gy50% = 22.5 Gy25% = 11.25 Gy
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NRG BR001: Benchmark Case 1
2 isocenters: passed on 2nd try.
120% = 54 Gy110% = 49.5 Gy105% = 47.25 Gy100% = 45 Gy95% = 42.75 Gy90% = 40.5 Gy80% = 36 Gy70% = 31.5 Gy50% = 22.5 Gy25% = 11.25 Gy
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NRG BR001: Benchmark Case 1D2cm = Max Dose at 2cm from PTV > 70%
2 isocenters: passed on 2nd try.
120% = 54 Gy110% = 49.5 Gy105% = 47.25 Gy100% = 45 Gy95% = 42.75 Gy90% = 40.5 Gy80% = 36 Gy70% = 31.5 Gy50% = 22.5 Gy25% = 11.25 Gy
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NRG BR001: Benchmark Case 15
Passed on 1st try using VMAT.
120% = 54 Gy110% = 49.5 Gy105% = 47.25 Gy100% = 45 Gy95% = 42.75 Gy90% = 40.5 Gy80% = 36 Gy70% = 31.5 Gy50% = 22.5 Gy25% = 11.25 Gy
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NRG BR001: Benchmark Case 6Priority = PTV
Passed on 1st try using VMAT.
120% = 54 Gy110% = 49.5 Gy105% = 47.25 Gy100% = 45 Gy95% = 42.75 Gy90% = 40.5 Gy80% = 36 Gy70% = 31.5 Gy50% = 22.5 Gy25% = 11.25 Gy
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NRG BR001: Benchmark Case 3Priority = Stomach
Passed on 1st try using VMAT.
120% = 54 Gy110% = 49.5 Gy105% = 47.25 Gy100% = 45 Gy95% = 42.75 Gy90% = 40.5 Gy80% = 36 Gy70% = 31.5 Gy50% = 22.5 Gy25% = 11.25 Gy
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NRG BR001: Benchmark Case 11
100% connecting
Met DVA criteria but did not pass.
120% = 54 Gy110% = 49.5 Gy105% = 47.25 Gy100% = 45 Gy95% = 42.75 Gy90% = 40.5 Gy80% = 36 Gy70% = 31.5 Gy50% = 22.5 Gy25% = 11.25 Gy
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NRG BR001: Benchmark Case 19
95% connecting
Met DVA criteria but did not pass.
120% = 54 Gy110% = 49.5 Gy105% = 47.25 Gy100% = 45 Gy95% = 42.75 Gy90% = 40.5 Gy80% = 36 Gy70% = 31.5 Gy50% = 22.5 Gy25% = 11.25 Gy
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NRG BR001: Benchmark Case 20 CyberKnife
Did not pass.
120% = 54 Gy110% = 49.5 Gy105% = 47.25 Gy100% = 45 Gy95% = 42.75 Gy90% = 40.5 Gy80% = 36 Gy70% = 31.5 Gy50% = 22.5 Gy25% = 11.25 Gy
> 90%
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NRG BR001: Benchmark Case 21 CyberKnife
Passed on 1st try.
120% = 54 Gy110% = 49.5 Gy105% = 47.25 Gy100% = 45 Gy95% = 42.75 Gy90% = 40.5 Gy80% = 36 Gy70% = 31.5 Gy50% = 22.5 Gy25% = 11.25 Gy
D2cm = Max Dose at 2cm from PTV = 79%
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IGRT Credentialing Review
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NRG BR001: IGRT Credentialing
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NRG BR001: IGRT Credentialing
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NRG BR001: IGRT Credentialing
• Purpose: – To assess whether positioning with image‐guidance will ensure
accurate PTV coverage
• How is this accomplished?– Assess description of IGRT workflow including threshold for correction
of translations & rotations– Assess image quality (technique, FOV) – Assess final treatment position relative to PTV margin required for
protocol
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NRG BR001: IGRT Credentialing
• Potential issues encountered with 3D registration:– Table movement prior to acquiring CBCT– Inter‐observer variation
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NRG BR001: IGRT Credentialing
• Recommended data for 2D IGRT:– 2D screenshots in addition to 2D DICOM images:
• Reticule or scale• PTV contours• OAR contours (e.g., lung, spine)
– 2D OBI screenshots at final treatment position helpful
• Recommended data for 3D IGRT:– Screenshots of in‐house registration between CBCT & planning CT
• Reticule or scale• 3D blending/subtraction
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NRG BR001: 3D Spine IGRT Case 3BrainLab ExacTrac
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NRG BR001: 3D Spine IGRT Case 3
OBI kV
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NRG BR001: 3D Spine IGRT Case 3
OBI kV
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NRG BR001: 3D Spine IGRT Case 3
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NRG BR001: 3D Spine IGRT Case 9
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NRG BR001: 3D Spine IGRT Case 9
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NRG BR001: 3D Spine IGRT Case 9
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NRG BR001: 3D Spine IGRT Case 9Axis X Y ZInstitution Shifts ‐8.0 1.0 2.0Reviewer Shifts ‐5.6 1.5 1.0Difference ‐2.4 0.5 1.0
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NRG BR001: 3D Spine IGRT Case 9
Axis X (mm) Y (mm) Z (mm)Institution’s Shifts ‐8.0 1.0 2.0Reviewer’s Shifts ‐5.6 1.5 1.0Difference ‐2.4 0.5 1.0
Rotational Differences < 2 degrees
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NRG BR001: 3D Spine IGRT Case 9
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NRG BR001: 3D Lung IGRT Case 9
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NRG BR001: 3D Lung IGRT Case 9
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NRG BR001: 3D Lung IGRT Case 9
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NRG BR001: 3D Lung IGRT Case 9
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NRG BR001: 3D Lung IGRT Case 9
Axis X (mm) Y (mm) Z (mm)Institution’s Shifts 2.3 ‐4.6 6.5Reviewer’s Shifts 1.6 0.1 ‐5.2Difference 0.7 ‐4.7 ‐1.3
Rotational Differences < 2 degrees
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NRG BR001: 3D Lung IGRT Case 9
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Available Resources & Guidelines
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NRG BR001: Resources
• IROC website with DVA & FAQ documents• Email PIs or physics PIs• Feedback is welcomed!