Validation of 4D dose calculation using an independent motion monitoring by the calypso tracking system and 3D polymer gel dosimetry
P. Mann,N. Saito,C. Lang,A. Runz,W. Johnen,M Witte,D Schmitt,Christian P. Karger +7 more
- Vol. 847, Iss: 1, pp 012040
TLDR
An in-house developed 4D dose calculation algorithm that uses Calypso motion tracking data and to compare the results against 3D polymer gel dosimetry measurements shows good agreement with the gel-dosimetric measurements in most of the volume.Abstract:
This study aims to evaluate an in-house developed 4D dose calculation algorithm that uses Calypso motion tracking data and to compare the results against 3D polymer gel dosimetry measurements. For this, a cylindrical water phantom was constructed that allows to insert (i) the polymer gel, (ii) a PinPoint ® ionization chamber and (iii) Calypso beacons™ for motion tracking. A treatment plan covering a gel flask in the center of the static phantom plus a 1 mm margin homogeneously with dose was generated. During irradiation, however, the phantom was moved periodically by means of a robot with a peak-to-peak amplitude of 2.5 cm. The results of the 4D dose calculations show good agreement with the gel-dosimetric measurements in most of the volume. Remaining small deviations have to be evaluated in further experiments. The developed experimental setup allows for 3D-dosimetric validation of 4D dose calculations algorithms prior to application in patients.read more
Citations
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Absolute dosimetry with polymer gels-a TLD reference system.
TL;DR: This study presents a novel method combining 3D PG and TL dose measurements for the purpose of absolute 3D dose measurements that can also be applied in complex anthropomorphic phantoms using only a single measurement.
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4D in vivo dose verification for real-time tumor tracking treatments using EPID dosimetry.
TL;DR: Clinical feasibility and baseline accuracy are established of using the transmission EPID-based, in vivo patient dose verification for MLC-tracking treatments and a dynamic anthropomorphic phantom to verify baseline accuracy.
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