E. Mezzenga, E. Cagni, A. Botti, M. Orlandi, M. Iori Medical Physics Unit, ASMN-IRCCS of Reggio Emilia, Italy

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Presentation transcript:

E. Mezzenga, E. Cagni, A. Botti, M. Orlandi, M. Iori Medical Physics Unit, ASMN-IRCCS of Reggio Emilia, Italy

DOSIMETRY CHECK TM : configuration Clinical beam profile measurements from acceptance test measurements (ATP) (example case for field width 1cm) Gaussian monoenergatic dose kernel Minimizing the cost function  between measured and computed Percent Depth Dose (PDD) Modelling New photonic spectra (  ) Polyenergetic dose kernel (not gaussian) YES NO Fit Tomotherapy dose kernel final results for all field width

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 voxel: 5mm FW (cm)  mean (  ≤  local point diff% PLAN 51,00,40496,3%-2,0% PLAN 32,50,58182,4%-3,3% PLAN 15,00,47580,8%-4,2% DC voxel: 2mm FW (cm)  mean (  ≤  local point diff% PLAN 51,00,35798,4%-1,7% PLAN 32,50,40296,3%-0,8% PLAN 15,00,42195,7%-1,5% TPS vs 2Darray/OCTAVIUS FW (cm)  mean (  ≤  local point diff% PLAN 51,00,365100,0%2,7% PLAN 32,50,227100,0%0,6% PLAN 15,00,182100,0%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!

In-vivo simulation of a prostate treatment performed on 2Darray/OCTAVIUS Point 1 Point 2 Point 3Point 4 Iso_Plan

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)

In-vivo dosimetry of patient-specific Tomotherapy treatment plans: Brain Brain Prostate Prostate Head & neck Head & neck Thorax Thorax considered during the first session of their treatment session.

Sagittal view Coronal view Transverse 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

Prostate Sagittal view Coronal view Transverse 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

Head & neck Sagittal view Coronal view Transverse 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

Thorax Line profiles (dotted TPS, continuous DOSIMETRY CHECK) along the dotted yellow line in the corresponding upper view. 3D gamma analysis Sagittal view Coronal view Transverse view 3D Isodose line comparison (blue TPS, green DOSIMETRY CHECK).

Sagittal view Coronal view Transverse view 3D Isodose line comparison (blue TPS, green DOSIMETRY CHECK). 3D gamma analysis Planning kVCT a) In-vivo dosimetry of a head & neck patient-specific Tomotherapy treatment plan: MVCT merged on planning kVCT DVH 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

Acknowledgments W.D. Renner, Peter Myshrall MathResolution LLC, Columbia, MD, USA A. Peroni, D. Raspanti, L.Valli TemaSinergie 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”