Biomedical Engineering Reference
In-Depth Information
protons, one can control the deposition of dose along the direction of
the beam as well as laterally. So, the question is, when it comes to
planning proton beam therapy, what's all the fuss about? Why isn't
Table 11.1. List of the steps in the planning process which differ in proton
beam planning as compared with photon beam planning.
step
protons vs.
photons
1
Evaluate the patient using all relevant diagnostic
tools, and decide whether to employ radiation
therapy.
∼
same
(but protons
may affect
choice of
modality)
2
Obtain and inter-register imaging studies with
the patient lying in the position to be used for
therapy.
same
3
Delineate on the planning CT the target volumes
(GTV, CTV and PTV) and normal tissues.
~same
(but PTV has
different
interpretation)
4
Establish the planning aims for the treatment.
same
5
Design one or more sets of beams, together with
their weights, each of which fulfills, to the extent
possible, the requirements of the planning aims.
different
6
Evaluate these plan(s) and either select one of
them for use or revise the planning aims and
return to step 5.
same
7
Finalize the prescription.
same
8
Simulate the selected plan to ensure it is
deliverable.
same
9
Deliver the treatment, and verify that the
delivery is correct.
∼
same
(but QA
harder)
10
Re-evaluate the patient during the course of
treatment and, if necessary, return to step 5, or
even 2, to re-plan the remainder of the treatment.
same
11
Document and archive the final treatment plan.
same
12
Review the treatment plan at the time of patient
follow-up or possible recurrence.
same
