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E. Mezzenga, E. Cagni, A. Botti, M. Orlandi, M. Iori
Medical Physics Unit, ASMN-IRCCS of Reggio Emilia, Italy
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DOSIMETRY CHECKTM : configurationClinical beam profile measurements from acceptance test measurements (ATP)
(example case for field width 1cm)
Gaussian monoenergatic
dose kernel
Minimizing the cost
function s(f) between
measured and computed
Percent Depth Dose
(PDD)
Modelling
New photonic
spectra (f)
Polyenergetic dose
kernel (not
gaussian)YES
NO
Fit Tomotherapy dose kernel final results for all field width
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Phantom test: voxel dimension and comparison
with conventional detector
TPS (blue) DC (green) dose
distribution comparison,
considering a Tomotherapy
IMRT verification test
Choice of the voxel dimension for dose computation performed by
DOSIMETRY CHECK.: DVHs comparison agreement
5 mm
3 mm
2 mm
2Darray vs DC
DC
vo
xel:
5m
m
FW (cm) gmean (g≤1)local point diff%
PLAN 5 1,0 0,404 96,3% -2,0%
PLAN 3 2,5 0,581 82,4% -3,3%
PLAN 1 5,0 0,475 80,8% -4,2%
DC
vo
xel:
2m
m
FW (cm) gmean (g≤1)local point diff%
PLAN 5 1,0 0,357 98,4% -1,7%
PLAN 3 2,5 0,402 96,3% -0,8%
PLAN 1 5,0 0,421 95,7% -1,5%
TPS vs 2Darray/OCTAVIUS
FW (cm) gmean (g≤1)local point diff%
PLAN 5 1,0 0,365 100,0% 2,7%
PLAN 3 2,5 0,227 100,0% 0,6%
PLAN 1 5,0 0,182 100,0% 0,7%
2D dose comparison perfomed by means of Verisoft v 4.2 between DC, TPS and 2Darray dose for
in-vivo simulationsituation
Best agreement
between DC
computed and
2Darray measured
dose!
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In-vivo simulation of a prostate treatment
performed on 2Darray/OCTAVIUS
Point 1
Point 2
Point 3 Point 4
Iso_Plan
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TPS dose vs 2Darray measurement
Gamma analisys: metric used in Verisoft
DC computed dose vs 2Darray
measurement
DVH comparison between TPS
(dotted) and DC (continuous)
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In-vivo dosimetry of patient-specific Tomotherapy
treatment plans:
•Brain
•Prostate
•Head & neck
•Thorax
considered during the first session of their
treatment session.
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Sagittal view Coronal viewTransverse view
3D Isodose line comparison (magenta TPS, green DOSIMETRY CHECK).
3D gamma analysis
Line profiles (dotted TPS, continuous DOSIMETRY CHECK) along the dotted yellow line in the corresponding upper view.
Brain
3D gamma analysis
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Prostate
Sagittal view Coronal viewTransverse view
3D Isodose line comparison (magenta TPS, green DOSIMETRY CHECK).
Line profiles (dotted TPS, continuous DOSIMETRY CHECK) along the dotted yellow line in the corresponding upper view.
3D gamma analysis
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Head & neck
Sagittal view Coronal viewTransverse view
3D Isodose line comparison (magenta TPS, green DOSIMETRY CHECK).
Line profiles (dotted TPS, continuous DOSIMETRY CHECK) along the dotted yellow line in the corresponding upper view.
3D gamma analysis
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Thorax
Line profiles (dotted TPS, continuous DOSIMETRY CHECK) along the dotted yellow line in the corresponding upper view.
3D gamma analysis
Sagittal view Coronal viewTransverse view
3D Isodose line comparison (blue TPS, green DOSIMETRY CHECK).
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Sagittal view Coronal viewTransverse view
3D Isodose line comparison (blue TPS, green DOSIMETRY CHECK).
3D gamma analysis
Planning kVCTa)
In-vivo dosimetry of a head & neck patient-specific
Tomotherapy treatment plan: MVCT merged on
planning kVCTDVH comparison between TPS (dotted) and DC (dashed) using the planning kVCT
Treat.#1 MVCT
DVH comparison between TPS (dotted) and DC (continuous) using the planning
kVCT merged with the MVCT acquired after the first treatment session
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AcknowledgmentsW.D. Renner, Peter Myshrall
MathResolution LLC, Columbia, MD, USA
A. Peroni, D. Raspanti, L.ValliTemaSinergie spa, Faenza, Italy
The results here shown represent a summary of those shown at:
Forthcoming pubblication:
E.Mezzenga et al., JINST, April 2014:
“Pre-treatment and in-vivo dosimetry of Helical Tomotherapy treatment plans using the
Dosimetry Check system”