Transcript Akcelerator medyczny Coline 15

Medical accelerator
Coline 15
Janusz Harasimowicz
Sławomir Wronka
[email protected]
[email protected]
Physics and engineering in the present medicine and health care – challenges
to Poland as a new EU member, 29-30 September 2005, Warsaw, Poland.
Physics and engineering in the present medicine and health care – challenges
to Poland as a new EU member, 29-30 September 2005, Warsaw, Poland.
Physics and engineering in the present medicine and health care – challenges
to Poland as a new EU member, 29-30 September 2005, Warsaw, Poland.
New medical linac
• Stable work and safety.
• Wider energy range.
• Integration with R&V
(record and verify)
systems by DICOM
standard.
• Electronic portal imaging
device (EPID) and
multileaf collimator
(MLC) as an option.
Physics and engineering in the present medicine and health care – challenges
to Poland as a new EU member, 29-30 September 2005, Warsaw, Poland.
Medical linac scheme
Electron
source
Bending
magnet
Accelerating structure
Pulse
modulator
Klystron or
magnetron
Treatment
head
Physics and engineering in the present medicine and health care – challenges
to Poland as a new EU member, 29-30 September 2005, Warsaw, Poland.
Accelerating structure
Physics and engineering in the present medicine and health care – challenges
to Poland as a new EU member, 29-30 September 2005, Warsaw, Poland.
Accelerating structure
• Total length: 1.4 m.
• 29 accelerating cells
made of deoxidized
cooper.
• Structure:
–
–
–
–
π/2 mode,
on-axis coupled,
standing wave,
operating at frequency
~2998 MHz.
Physics and engineering in the present medicine and health care – challenges
to Poland as a new EU member, 29-30 September 2005, Warsaw, Poland.
Accelerating structure
Physics and engineering in the present medicine and health care – challenges
to Poland as a new EU member, 29-30 September 2005, Warsaw, Poland.
Microwave power source
• Power source located
outside the gantry (thus
instability during gantry
rotation is eliminated).
• First accelerator equipped
with 3.1 MW magnetron:
– electron beam energy up to
15 MeV,
– photon beam energy up to
10 MeV.
• Possible use of klystron
(higher energies).
Physics and engineering in the present medicine and health care – challenges
to Poland as a new EU member, 29-30 September 2005, Warsaw, Poland.
Pulse modulator
• New modulator based on
„solid state” technology.
• Higher stability of work,
shorter pulse increase time
and lower E-M disturbance
emission in comparison to
thyratron based modulators
(„PFN” type) used so far.
• Lower „beam start-up-time”
thanks to separation of RF
and electron gun systems.
Physics and engineering in the present medicine and health care – challenges
to Poland as a new EU member, 29-30 September 2005, Warsaw, Poland.
Beam stability
• Measured signals are
digitalized and used for
dose rate monitoring,
total dose calculation and
dynamic correction of exit
beam position.
• Flatness and symmetry
are verified and corrected
online by two coils
located in 270o deflection
system.
Physics and engineering in the present medicine and health care – challenges
to Poland as a new EU member, 29-30 September 2005, Warsaw, Poland.
Dosimetry
• Two independent
dose monitoring
system (also independent power supply for
both dosimetry
channels).
• New construction of
ionization chamber
(four sectors).
Physics and engineering in the present medicine and health care – challenges
to Poland as a new EU member, 29-30 September 2005, Warsaw, Poland.
Control of beam energy
Physics and engineering in the present medicine and health care – challenges
to Poland as a new EU member, 29-30 September 2005, Warsaw, Poland.
Control of beam energy
Physics and engineering in the present medicine and health care – challenges
to Poland as a new EU member, 29-30 September 2005, Warsaw, Poland.
Beam parameters
Photon beam
Energy
Dose rate
Flatness*
Symmetry*
6 or 9 MeV
up to 600 MU/min.
 106/110 % **
 103 % **
Electron beam
Energy
Dose rate
Flatness*
Symmetry*
6-15 MeV (4 or 5)
to 1000 MU/min.
 10/20 mm **
 105 % **
* In accordance with suggested values of IEC 977 standard.
** Or better.
Physics and engineering in the present medicine and health care – challenges
to Poland as a new EU member, 29-30 September 2005, Warsaw, Poland.
Safety
• Fulfilment of Polish and European
standards guarantees safe work of
the accelerator.
• In particular it indicates application of
protection systems ensuring, for example,
accelerator auto-shut-down in case of
instability of dose, dose rate or energy
when it exceeds acceptable range.
Physics and engineering in the present medicine and health care – challenges
to Poland as a new EU member, 29-30 September 2005, Warsaw, Poland.
Standards
• PN-EN 60601-2-1:2005: Particular requirements for the
safety of electron accelerators in the range 1 MeV to 50 MeV.
• PN-EN 60601-1-4:2002(U): Programmable electrical medical
systems.
• PN-EN 60976:2002(U): Medical electron accelerators.
Functional performance characteristics.
• IEC 977: Medical electron accelerators in the range 1 MeV
to 50 MeV. Guidelines for functional performance
characteristics.
• PN-EN 60601-1-2:2002: Medical electrical equipment.
Electromagnetic compatibility. Requirements and tests.
• PN-EN ISO 14971:2004: Application of risk management
to medical devices.
Physics and engineering in the present medicine and health care – challenges
to Poland as a new EU member, 29-30 September 2005, Warsaw, Poland.
Electronic portal
imaging device
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•
•
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Amorphous silicon matrix
Scintillator screen: Lanex
Resolution:
1024 x 1024
Pixel pitch: 400 µm
Matrix size:
41 cm x 41 cm
ADC converter: 16 bits
Integration time:
from 66.45 ms
Energy range:
40 keV – 15 MeV
Physics and engineering in the present medicine and health care – challenges
to Poland as a new EU member, 29-30 September 2005, Warsaw, Poland.
Multileaf collimator
• 80 leaves („tongue
and groove” type)
made of tungsten.
• Leaf width at
isocentre: 1 cm.
• Maximum field size:
40 cm x 40 cm.
• Distance to
isocentre: ~40 cm.
Physics and engineering in the present medicine and health care – challenges
to Poland as a new EU member, 29-30 September 2005, Warsaw, Poland.
Research and development
Pomiary emisji cząstek generowanych
przez akcelerator Coline 15
1000
Liczba cząstek
100
10
1
0
200
400
600
800
Numer kanału
1000
1200
1400
Physics and engineering in the present medicine and health care – challenges
to Poland as a new EU member, 29-30 September 2005, Warsaw, Poland.
Coline 15
A part of the group involved in constructing of Coline 15
in front of the prototype.
Physics and engineering in the present medicine and health care – challenges
to Poland as a new EU member, 29-30 September 2005, Warsaw, Poland.
For more information
concerning present activity
of Establishment for
Nuclear Equipment visit:
www.zdaj.com
Thank you for your attention.
Any comments are welcome.
Janusz Harasimowicz
[email protected]
Physics and engineering in the present medicine and health care – challenges
to Poland as a new EU member, 29-30 September 2005, Warsaw, Poland.