Planning for the Installation of a Compact Superconducting...
Transcript of Planning for the Installation of a Compact Superconducting...
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Planning for the Installation of a Compact Superconducting Proton
Therapy Unit in a Busy Medical Center Environment
Barry W. Wessels, Ph.D.Director of Medical Physics and DosimetryCase Western Reserve University School of Medicine
Cleveland, OH, USA
Adapted from a presentation given by David B. Mansur, M.D.At PTCOG 53 (June 2013)
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Disclosures
• Collaboration Contract with Philips Medical Systems for Proton RTP (No cost)
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Cleveland, Ohio, USA
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New Brunswick
Existing Proton Centers NE USA
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Existing + Planned Proton Centers
New Brunswick
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Protons in Cleveland: Our Mission
• Build the first proton therapy facility in the region
• Establish a center of excellence for pediatric radiation oncology
• Supplement existing advanced technologies (Cyberknife, Perfexion Gamma Knife, VMAT, Tomotherapy, IORT) at Seidman CC for select patients.
• Participate in national and institutional clinical trials
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Proton Clinical Benefit - Avoid collateral dose
Photon Beam Delivery
Proton Beam Delivery
Pediatric Medulloblastoma% DoseRec’d
100
50
10
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250%
20%
40%
60%
80%
100%
0 5 10 15 20 30 35
Depth in Water (cm)
Dose (%
)
BAD DoseGood
Dose
Tumor
More BAD Dose
Good DoseGood Dose/Bad Dose
11/10/2013 8
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Protons in Cleveland: Our plan
• A 6,000 square foot all inclusive facility in the heart of our existing NCI designated comprehensive cancer center
• Down one corridor, 30 meters from Rainbow Babies and Children’s Hospital
• 2 phase project, one vault for each phase• Orthogonal KV, and diagnostic CT image
guidance initially for IGRT.
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Protons in Cleveland: Our Campus
• Case Western Reserve University and School of Medicine• > 1000 Beds:• University Hospitals
– Lerner Tower– Mather Pavilion– Lakeside Hospital– MacDonald Women’s Hospital– University Psychiatric Center– Hanna Pavilion
• Seidman Cancer Center – Dedicated Cancer hospital and outpatient treatment facility
• Rainbow Babies and Children’s Hospital– 240 bed tertiary care children’s hospital
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N
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1717N
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Size Does Matter• Limited space precludes large, multi-gantry
proton therapy systems with fixed external cyclotron
• Smaller facility using a compact superconducting Cyclotron needed to meet the mission of the UH Case Medical Center – Full Energy (250 MeV) proton beam and dose on target (2 – 4 Gy/min)
• Single room system would be ideal in this location
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1946
1996
2000
2008
Harvard
IBA
Accel
Still River
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This device has not been cleared by the US Food and Drug Administration for clinical use
A 10 Tesla Superconducting Magnet enables a smaller, lower cost gantry mounted Cyclotron.
Superconducting Synchrocyclotron
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Vive la difference
• Cyclotron– Single large magnet– Constant (in time) magnetic field– Orbits increase is size as energy increases
• Synchrotron– Many small magnets– Orbit is constant in size (ring)– Magnetic field increases (ramping) as energy
increases11/10/2013 Penn Ohio AAPM Chapter Meeting 21
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Mevion S250
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Beam Shaping
Passive Scattering and Active Scanning Beams
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Passive Beam Delivery Schematic
Cyclotron
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Patient Specific Apertures and Energy Range Shifters
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Pencil Beam Scanning
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Mevion Proton TherapyBeam Delivery: Uniform Field and Dedicated IMPT
• Uniform Field: modern 4th generation with exclusive direct beam modulation –passive scattering– Safe, automated, and precise– Standard with 2012 deliveries– Retrofittable and upgradable
• IMPT: fast spot scanning supported by exclusive direct beam modulation– Under development: working prototype end 2012 with release in
2014 – High speed with up to 10 target painting per minute– Retrofittable and upgradable
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IMPT – Spot Scanning - Mevion
Spot Size exit accelerator: 1.3 x 1.3 mm 2 Gy/min to 1 liter with 10 repainting Work-in-Progress – Feb.
2012
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Comparison – Beam Scattering to Scanning
Modality/Property Passive Scattering Active Scattering
2 D field shaping Yes Yes
3 D field shaping No Yes
Sensitive to organ motion Moderate High
Field Adapter Yes Superior field definition if used
Range Compensator Yes No
Neutron activation Moderate - safe Low - safe
System Maturity Standard – 80,000 patient worldwide experience
Emerging technology < 1,000 patient worldwide
System maintenance and required QA
Standard, patient specific compensator fabrication required
High, Patient specific QA required, no compensator
Patient through-put per room/day
10 -15 – 10 hr day Low - < 6 pts/day (March 2012)
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Unique Shielding Considerations
• Primary Proton beam and neutron production– Occupancy
Factors• Neutrons
– CT scanner• Magnetic Field and
Radio waves– Proximity of MRI
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Scattered Beam
Corridor
Finance Office
Department
CT angio
*
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Primary and Scattered Beam
Analytical Calculations
Courtesy Jim Brindle, Ph.D and Barry Wessels ,Ph.D
Monte Carlo Calculations Courtesy Jeff Siebers, Ph.D
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11/10/2013 UH Shielding Evaluation© 2013 J.V. Siebers
Note: Wall is angled here, so
attenuation does
correspond with wall
Elevation Section Through Maze 1’ thick maze ceiling to match tx room roof
Towards MR
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Neutron Damage to CT?
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RF and Magnetic Fields
MRI
Suite
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RF Grounded Shield
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Magnetic Field
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Setting up a commissioning plan
•We just bought a proton-therapy system!
•A cyclotron based system with not one, not two, but three gantries!
•We are going to treat 1200 patients a year, 14 hours a day, and for six days a week.
•There will be pediatric cases, prostates, head&neck, lung, radio-surgery…..
•We will be starting on September 1.
•Can you commission the system for us?
Boss
UHCMC approach is scaled appropriately for anticipated market
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Business plan • Patient mix
– Pediatric Anesthesia 35%– Lung 15 %– Brain/spine 15%– Targeted Reirradiation or boost 15%– Head and Neck 10%– GU/Prostate 10%
• Operation – after year 2– 14-16 hours scheduled – with Physics QA– 15-25 patients per day
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Definitions of acceptance and commissioning
• Acceptance Testing
‘.. to determine that all applicable radiation safety standards are met or exceeded and that the machine meets or exceeds the contractual specifications.’
‘A satisfactorily completed acceptance test simply assures that the accelerator and its associated systems satisfy all performance specifications and pertinent safety requirements.’
• Commissioning
‘….refers to the process whereby the needed machine-specific beam data are acquired and operational procedures are defined.’
AAPM code of practice for radiotherapy accelerators: Report of AAPM Radiation Therapy Task Group No. 45
→ Vendor and customer
→ Customer
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Determine the parameters to verify
• range• modulation width• dose variation uniform region• distal fall-off• skin dose / proximal region D
epth
dos
e
• uniformity profile (tilt/flatness) • maximum field size• lateral penumbra vs. depth• field size vs. depth
Late
ral
• dose per MU• dose rate
Abso
lute
Prescription
• range• modulation width• field size• dose rate• dose• gantry angle• SSD (air gap)• snout size
DeliveryEquipment settings
For what subset of prescribed parameters do these need to be
verified?
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Defining the subset – PDD uniformity
Option YesSuboption YesModulation NoField size YesSnout size MaybeGantry angle UnlikelyDose rate UnlikelyDose NoSSD Yes
Does the pdd uniformity depend on……
Measure…• 1 full-mod SOBP per suboption• 2 sobp for all snouts• 1 sobp for 2 gantry angles • 1 sobp for 3 dose rates• 2 sobp for varying SSD• sobp’s for small aperture size
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Treatment PlanningTreatment Planning: : Eclipse, CMS, Pinnacle
Oncology Information SystemOncology Information System: : IMPAC or ARIA
• Workflow anticipated to be similar to conventional linear accelerator• Schedule, treat, verify and record
R&V IntegrationR&V IntegrationTPSTPS
Oncology Information System and TPS
Treatment ConsoleTreatment Console
Clinical Integration
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University Hospitals Team• Physics and Dosimetry
• Director of UH Proton Medical Physics (1 FTE) - TBA• Staff Proton physicist and Physicist Assistant (2 FTE) - TBA• Proton Dosimetrist (1 FTE) - TBA• Barry Wessels, PhD -- Director of Medical Physics• Jeff Siebers, PhD and Charles Bloch, PhD. – Technical and Shielding
Consultants
• Therapist – TBA - 4 FTE
• Physicians• David Mansur, MD – Director UH Proton Center• Mitch Machtay, MD – Chairman of Radiation Oncology
• Administration• Nathan Levitan, MD, MBA – President Seidman Cancer Center• Linda Mangosh, RTT, MBA – VP Operations Seidman Cancer Center • Brenda Myers, RTT – Clinical Manager Radiation Oncology
• Construction• Crandall Miller• Linda Hulsman
• Administrative Assistance• Edie Cawley
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Shovel in the Ground – 10/11/13
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Timeline• Complete architectural &
construction design Sept 2013
• Ground breaking Sept 2013
• Gantry embeds Jan 2013
• Receive Accelerator Sept 2014
• Complete installation Jan 2015
• Acceptance Mar 2015
• Commissioning August 2015
• Clinical operation September 2015
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Thank You