The CATANA Protontherapy Beam Delivery System
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Transcript of The CATANA Protontherapy Beam Delivery System
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The CATANA
Protontherapy Beam Delivery System
Laboratori Nazionali del Sud (INFN)Via S. Sofia 44Catania, ITALY
Cuttone G., Cirrone G.A.P., Lojacono P.A., Lo Nigro S., Raffaele L., Rovelli A.,Sabini M.G., Salamone V.
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LNS Superconducting Cyclotron is the
unique machine in in Italy and South Europe used for protontherapy
Treatment of the choroidal melanoma
In Italy about 300 new cases for year
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•0 ° respect the switching magnet
•80 meter after extraction
•3 m proton beam line
LAYOUT OF LNSPRESENT TREATMENT ROOM
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OUR HISTORY STARTED THREE YEARS AGO......
1999
WITH A BARE BUT VERY STABLE TABLE
AND A SUPERCONDUCTOR CYCLOTRON SUITABLE FOR62 AMeV PROTON BEAM
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FIRST OF ALL WE TOOK IN CONSIDERATION TWO
PARAMETER FOR THE DEVELOPMENT OF OUR PROTON
BEAM DELIVERY SYSTEM:
ENERGY In order to obtain ranges up to 30 mm E.T.
OMOGENEITY In terms of lateral dose distribution in air
In order to reach a proton beam irradiation field:
Omogeneus within 2.5 %
With lateral penumbra of about 1mm
At least 30 mm in diameter
at isocenter in air
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WE DECIDED FOR A PASSIVE SCATTERER SYSTEM AND STUDIED THREE DIFFERENT EXPERIMENTAL
CONFIGUARATIONS
SIMULATION TOOLKIT : TRIM2000 UNDER NT OS
GEANT3.0 UNDER LINUX RED HAT 6.1 OS
SINGLE SCATTERER FOIL300 m Tantalum
DOUBLE SCATTERER FOIL80 m + 20 m Tantalum
DOUBLE SCATTERER FOIL WITH CENTRAL STOPPER15 m + 25 m + 7 mm thick copper beam stopper
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SIMULATION RESULTS
TRANSMITTED ENERGY [AMeV]
PRACTICAL RANGE
[mm WATER]
LATERAL OMOGENEITY [mm][FROM 95% TO 95%]
SINGLE FOIL
57.248 28.43 27
DOUBLE FOIL
57.625 29.12 24
DOUBLE FOIL WITH
BEAM STOPPER
60 30.97 47
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MONTE CARLO SIMULATION
EXPERIMENTAL RESULT(Silicon Diode)
EXPERIMENTAL RESULTS
OUR BEAM PROFILE WITH A 50 mm DIAMETER FINAL COLLIMATOR
SIMULATION VS. EXPERIMENTAL RESULT
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EXPERIMENTAL RESULTS
LNS PURE BRAGG PEAK
PRACTICAL RANGE
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PEAK/PLATEAU RATIO
FWHM [mm
water]
DISTAL FALL-OFF [mm water]
Energy [AMeV]
EXPERIMENTAL DATA 30.9 4.5 3 0.8 60
SIMULATION DATA 30.97 4.47 2.7 0.6 60
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Scatterer system
Modulator & Range shifter
Monitor chambers
Ligth field
Laser
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WE EVALUATED THE PROTON BEAM LATERAL DISTRIBUTION ALONG OUR BEAM LINE
1. JUST AFTER THE FIRST SCATTERER
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2. AFTER THE SECOND SCATTERER
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3. AT ISOCENTER WITH A 25 mm COLLIMATOR
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The actual distance beetwen modulator and range shifter is 33 cm
IN COLLABORATION WITH CCO WE PRODUCED A PRELIMINARY SET OF MODULATORS
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It is interesting to note we didn’t find any difference in the experimental results, varing this distance from 15 cm up to 33 cm
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1999
ACTUALLY THE BEAM LINE IS READY
2002, February
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WE ACKNOWLEDGE FOR THEIR SUPPORT AND ENCOURAGEMENT:
CCO A. Kacperek
M. Sheen
PSI E. Egger
TRIUMF E. Blackmore
MGH B. Gottshalk
AND LAST BUT NOT AT LEAST
Prof. G. Biti University of Florence
For his support in clinical authorization