Environmental Engineering Reference
In-Depth Information
Changing of Ion & Organ
(Ionization by Energy Losses)
Changing of Organ
Changing of Ion
Optimized Energy Selection
Optimized Energy Selection
(Energy Recoils by Energy Losses)
(Energy Recoils by Energy Losses)
Calculations of
E
m
or E
t
Comparisons
for Better erapy
FIGURE 7.6
Protocol.for.ion.beam.therapy.(PIBT).
incorporated.with.simulations.are.programmed.by.this.protocol..Therefore,.
the.eficiency.of.removing.cancer.cells.could.be.increased..Systematic.simu-
lations. can. avoid. the. risk. of. overdosing. normal. cells.. Following. the.
as low
as reasonably achievable
.(ALARA).concept.of.radiation.protections,.radiation.
hazards.are.prevented.by.this.protocol..This.new.protocol.could.eliminate.
the.possibility.of.overdose.accidents..In.addition,.the.cost.of.accelerator.oper-
ations.is.reduced.because.simulation.can.be.done.on.a.small.personal.com-
puter..Treatment.time.reduction.is.also.a.very.important.advantage.
To. solve. the. dose. distribution. of. the. ion. beam,. it. will. be. necessary. to.
determine.how.to.manage.the.ion.beam.so.that.it.can.be.shaped.appropri-
ately.(Kanai.et.al..1997,.Loncol.et.al..1997)..Therefore,.as.we.examined.in.this.
chapter,.heavy.ion.energy.can.affect.the.different.Bragg.peak.distributions..
Spreading. out. of. the. Bragg. peak. can. be. accomplished. by. varying. beam.
intensity.. Probabilistically,. like. the. Monte. Carlo. simulation. of. the. study.
where.an.ion.beam.is.generated.as.the.random.sampling.for.the.simulation.
of.the.interactions.between.beam.and.organ,.the.higher.intensity.beam.can.
penetrate.into.the.deep.regions.of.the.human.body..In.a.real.hospital.facil-
ity,. it. will. be. necessary. to. make. room. for. therapy. planning. and. the. staff's.
operation.space..In.addition,.the.accelerator.should.be.designed.for.various.
energies.and.intensities..The.Bragg.peak.can.be.varied.based.on.the.energy.
of.the.ion.and.the.human.organ.characteristics,.so.the.dose.and.its.related.
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