DOSE DELIVERY SYSTEM OF THE VARIAN PROBEAM SYSTEM WITH CONTINUOUS BEAM
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1 DOSE DELIVERY SYSTEM OF THE VARIAN PROBEAM SYSTEM WITH CONTINUOUS BEAM EUCARD 2 WORKSHOP ON INNOVATIVE DELIVERY SYSTEMS IN PARTICLE THERAPY TORINO, FEB 2017 VARIAN PARTICLE THERAPY HOLGER GÖBEL MANGER BEAM DELIVERY
2 TOPICS Commissioning and performance of Varian ProBeam System - Central Beam - Beam Delivery System - Beam Matching Continuous Beam versus Pulsed Beam - Pencil Beam Scanning - Challenges for Pulsed Beam Treatment Time Dose Monitor Stability
3 Dynamic Peak Scanning 2 nd Generation IMPT Dynamic Peak Scanning Varian IMPT since 2009 clinical Focus on dedicated scanning nozzles 2 Gy / L / min Documented beam precision <0.5 mm radius sphere 30 x 40 cm field size Total of 17 treatment rooms in Munich, San Diego, Baltimore and Cincinnati 3 VARIAN PARTICLE THERAPY
4 PROPERTIES BEAM DELIVERY I CENTRAL AXIS BEAM COMMISSIONING RESULTS VARIAN PARTICLE THERAPY
5 Beamline Bragg Peaks at isocenter peak measurements 5 VARIAN PARTICLE THERAPY
6 Beamline Fine Steering to Isocenter DEDICATED MEASUREMENT TOOLS DEVELOPED BY VARIAN AUTOMATED AND INTEGRATED INTO COMMISSIONING SOFTWARE TOOL 6 VARIAN PARTICLE THERAPY
7 Beamline Beam shape at isocenter 7 VARIAN PARTICLE THERAPY
8 PROPERTIES BEAM DELIVERY II SCANNING BEAM COMMISSIONING RESULTS VARIAN PARTICLE THERAPY
9 Pro Beam Delivery Nozzle Scanning Magnets asi Flat Panels (kv imaging) Vacuum Chamber Dose and Position Monitors Nozzle extension for Range-Shifter(s) 9 VARIAN PARTICLE THERAPY
10 Spot measurements with imaging system 244 MeV 69 MeV Active detection area 30cm x 40cm 10 VARIAN PARTICLE THERAPY
11 Scanning Magnets uncalibrated SPTC TR3 11 VARIAN PARTICLE THERAPY
12 Scanning Magnets calibrated SPTC TR3 12 VARIAN PARTICLE THERAPY
13 PROPERTIES BEAM DELIVERY III BEAM MATCHING BETWEEN ROOMS VARIAN PARTICLE THERAPY
14 Pencil Beam Scanning Commissioning of ECLIPSE Treatment Planning System PENCIL BEAM SCANNING ALGORITHM RELATIVE INTEGRATED DEPTH DOSE CALIBRATION OF DEPTH DOSE CURVES 2D SPOT SHAPES AT DIFFERENT DISTANCES ALL MEASUREMENTS CAN BE ACQUIRED WITHIN LESS THAN A DAY 14 VARIAN PARTICLE THERAPY
![IPDD [%] Matching of beam data: PDDs PDDs measured at different gantries 120 100 typical residual of two PDDs (230 MeV, different gantries) 80 60 40 20 0-1](/docs-images/81/83980218/images/15-1.jpg "Residual of 2 Bragg Peaks of same beam energy at two different gantries -2-3 0 50 100 150 200 250 300 350 400 depth in water [mm] 15 VARIAN PARTICLE")
15 IPDD [%] Matching of beam data: PDDs PDDs measured at different gantries typical residual of two PDDs (230 MeV, different gantries) Residual of 2 Bragg Peaks of same beam energy at two different gantries depth in water [mm] 15 VARIAN PARTICLE THERAPY
16 Pencil Beam Scanning Dose-to-MU Output Calibration STABLE PERFORMANCE OF SYSTEM NO DAILY OUTPUT ADJUSTMENTS NECESSARY DD<1% NO GANTRY ANGLE DEPENDENCE LONG-TIME STABILITY initial system setup in San Diego vs. RPTC Munich 16 VARIAN PARTICLE THERAPY
17 planned vs. measured dose INTITAL SETUP OF TREATMENT PLANNING SYSTEM WITHOUT REFINEMENTS CUBIC VOLUMES IRRADIATED AND DISTIBUTION MEASURED WITH PTW 2DARRAY PASSRATE 99% FOR GAMMA-TEST (3%/3MM) (2Gy central TR3/16Aug2013) 17 VARIAN PARTICLE THERAPY
18 CONTINUOUS BEAM VERSUS PULSED BEAM CHALLENGES VARIAN PARTICLE THERAPY
19 Pencil Beam Scanning Scanning Control System One subsystem out of many for Proton Therapy System Treatment Planner (Eclipse ) User Interface treatment results Gantry angle for the field, energy for each layer, (x, y, MU) for each spot start, hold and pause irradiation progress data Scanning Subsystem beam current and Energy for each layer Turn beam on and off, Terminate irradiation Beam Adjustment Server Proton Cyclotron Controls beam current 19 VARIAN PARTICLE THERAPY
20 Pencil Beam Scanning Sequence during irradiation 1. Adjust beam energy 2. Set scanning magnet currents for first spot 3. Regulate the required accelerator beam current 4. Start irradiation 5. Measure monitor units until switch limit reached 6. Move beam to next spot (w/ or wo/ beam turned off) 7. Goto 5) until last spot in layer 8. Switch off beam and goto 1) until last layer Add-ons Checking various devices Pause, resume, or terminate irradiation at any time Acquire irradiation results 20 VARIAN PARTICLE THERAPY
21 Spot position Spot position Pencil Beam Scanning Scanning Method Far away spot Close spot Beam on time Beam on time 21 VARIAN PARTICLE THERAPY
22 POSITION DOSE BEAM Pencil Beam Scanning Scanning Method DOSE DRIVEN SPOT SCANNING D 1 D 2 D3 ON OFF CONTINUOUS BEAM FROM CYCLOTRON FAST BEAM ON/OFF BETWEEN CONSECUTIVE SPOTS IN E.G. MEANDER PATTERN OPTIMIZED DELIVERY FOR SHORT TREATMENT TIMES TIME DEFLECTION IN X- AND Y-DIRECTION:. 0,3 0,5 ms (spot to spot) Irradiation pattern /order of spots is given by treatment plan VARIATION OF ENERGY LAYER: < 0.9s. TYPICAL SPOT DURATION: 3 50 ms 22 VARIAN PARTICLE THERAPY
23 Pencil Beam Scanning 23 VARIAN PARTICLE THERAPY
24 Pencil Beam Scanning Basic Characteristics for Scanning Technique FEATURE energy range at isocenter average dose rate maximum field size at isocenter beam accuracy at isocenter (radius) SCANNING Typically MeV 2 Gy / l / min 30 x 40 cm 1 mm nominal spot size (one sigma value) mm (+/- 15%) layer switching time IMPT capable < 0.9 s yes 24 VARIAN PARTICLE THERAPY
25 POSITION DOSE BEAM Continuous beam versus pulsed beam Challenges Precision and a minimum spot weight of 1cGy at Bragg Peak and total spot area (1cm 2 ) translates into protons at 70 MeV and protons at 250 MeV ON OFF Spots with high spot weight up to 50cGy: protons at 70 MeV and protons at 250 MeV (4mm spot spacing, focused beam) TIME Time to switch to the next spot / switch off the high dose rates: ~200µs With a continuous beam, one can predict, when to switch 25 VARIAN PARTICLE THERAPY
26 Continuous beam versus pulsed beam Challenges Several pulses will be needed to get to the needed precision: Case 1: precision 2% per spot, uncertainty of the number of protons per pulse 20% => the planned MU per spot can be irradiated with 3 pulses: 83% + 14% + 3% Case 2: precision 2%, uncertainty of the number of protons per pulse 50% => the planned MU per spot can be irradiated with 5 pulses 67% + 22% + 7% + 3% + 1% If the beam is off, this amount of contribution of a pulse to the whole spot is too high, in order to stay within the 0,25 Gy to terminate the irradiation, and second for steering of the beam position, one needs to reduce the contribution of each pulse even more. 26 VARIAN PARTICLE THERAPY
27 Continuous beam versus pulsed beam Challenges A high beam current in the pulse is needed due to low duty factor in order to keep treatment time low Very good control of number of protons extracted per pulse by the accelerator High variability of the number of protons extracted per pulse in order to irradiate spots with high spot weight fast enough and with the needed precision Control loop and interfaces for the next pulse must be very fast in order to take into account the already delivered monitor units (collecting time of ionization chamber is ~ µs) and the measured beam position 27 VARIAN PARTICLE THERAPY
28 Continuous beam versus pulsed beam Challenges Saturation effects at high beam currents have to be corrected for the used primary and secondary dose monitor system Saturation of commercial available dosimetry equipment may be possible 70MeV: protons / 10µs = 128nA in the peak (0.13nA averaged) 250MeV: protons / 10µs = 400nA in the peak (0.4nA averaged) 70MeV: protons / 10µs = 6.4µA in the peak (6.4nA averaged) 250MeV: protons / 10µs = 20µA in the peak (20nA averaged) (average curent for 1kHz beam pulse repetiton) Beam position and beam width measurement have to be synchronous with the pulse beam time structure 28 VARIAN PARTICLE THERAPY
29 Continuous beam versus pulsed beam Impact on treatment time Increase the minimum spot weight from 1 cgy to several cgy in order to delivery faster with a focused beam, AND to still keep the clinical requirements Enlarge the spots by using a range-shifter as a scatterer in order to delivery faster by lowering the precision specifications and by increasing the minimum spot weight, BUT with a much less dose conformity than with focused beam. 29 VARIAN PARTICLE THERAPY
30 PROPERTIES BEAM DELIVERY IV TREATMENT TIME DOSE MONITOR STABILITY VARIAN PARTICLE THERAPY
31 Fast Treatment times Lung case Summary of treatment times (calculated) No layer switch time 200 ms 500 ms 900 ms 2F Plan Field 1/2 6.6 s 7.8 s 9.6 s 12 s Field 2/2 7.6 s 9 s 11.1 s 13.9 s 3F Plan Field 1/3 4 s 4.8 s 6 s 7.6 s Field 2/3 4.1 s 4.9 s 6.1 s 7.7 s Field 3/3 3.5 s 4.7 s 6.5 s 8.9 s 31 VARIAN PARTICLE THERAPY
32 Case 1 Liver Motion Managed Using Gating Moving shallow liver tumor of close to 1 Liter in size 2 field treatment 15 fractions of 4.5 Gy The Qfix SDX spirometry system was used 32 VARIAN PARTICLE THERAPY
33 Case 1 Liver Motion Managed Using Gating Fast beam delivery aids in motion management Field 1 delivered in 2 breath-holds Field 2 delivered in 1 breath-hold 33 VARIAN PARTICLE THERAPY
34 deviation (%) Dose Monitor Stability Stability Results of the absolute dose measurements over a 6months period Deviation measuremant to referenz [%] chamber 1 chamber 2 chamber 3 chamber 4 chamber time data courtesy of Mr Skalsky / RPTC Munich 34 VARIAN PARTICLE THERAPY
35 Planned vs measured dose 10cm x 10cm x cm depth Gamma Criteria of 3%/3mm: 98.5% (green area) 35 VARIAN PARTICLE THERAPY
36 Dynamic Peak Scanning 2 nd Generation IMPT Dynamic Peak Scanning Varian IMPT since 2009 clinical Focus on dedicated scanning nozzles 2 Gy / L / min Documented beam precision <0.5 mm radius sphere 30 x 40 cm field size Total of 17 treatment rooms in Munich, San Diego, Baltimore and Cincinnati 36 VARIAN PARTICLE THERAPY
37 Summary Pencil Beam Scanning with continuous beam High experience in clinical environment Short irradiation time per field, even within one breath hold Dose delivery is very stable very good dose conformity Well understood technology installation, commissioning and service can be handled by technicians not experts 37 VARIAN PARTICLE THERAPY
38 THANK YOU FOR YOUR ATTENTION THANKS TO THE ORGANIZERS VARIAN PARTICLE THERAPY HOLGER GÖBEL MANGER BEAM DELIVERY
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