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Study of MAGIC-F Gel and PENELOPE Code Simulation Response for Clinical Electron Beams

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T Pianoschi

T Pianoschi1*, M Alva-S�nchez2, M Santanna3, D C�sar4, P Nicolucci5, C Reis6, (1) University of Sao Paulo, Ribeirão Preto, Sao Paulo, (2) ,,,(3) Hospital do Câncer de Barretos, Barretos, Sao Paulo, (4) Hospital do Câncer de Barretos, Barretos, Sao Paulo, (5) University of Sao Paulo, Ribeirão Preto, São Paulo, (6) ,

SU-E-T-278 Sunday 3:00:00 PM - 6:00:00 PM Room: Exhibit Hall

Purpose:
To evaluate the response of MAGIC-f gel through dose response curves, percentage depth dose (PDD) and beam profile for clinical electron beams.
Methods:
Glass tubes (Vacutainer ®), with 6 cm length and 0.5 cm radius, with MAGIC-f were positioned inside a water phantom to study the gel response with doses from 0.5 Gy to 20 Gy in electron beams of 6, 9 e 12 MeV. Glass tubes of 20 cm length and 1 cm radius and PMMA phantoms of 10 x 5 x 5 cm³ were used to PDD and beam profiles determinations, respectively, with a maximum dose of 2 Gy to the gel. The samples were analyzed through magnetic resonance imaging (MRI) with a 3 T tomography using a head coil, multiple spin echo sequence with 16 echos, TE 15ms and TR 4000ms. The MAGIC-f response was simulated with PENELOPE Monte Carlo code in the same geometry used in the irradiations. The results obtained with MAGIC-f and PENELOPE were compared with clinical data.
Results:
Calibration curves for MAGIC-f showed a linear behavior, with correlation coefficient of 0.99, for all energies. The PDD and beam profile curves obtained with MAGIC-f presented differences lower than 1.5% and 3.0%, respectively, when compared to clinical data. Results obtained by PENELOPE and clinical data showed differences up to 1.0% and 1.5%, respectively, for PDD and profile curves.
Conclusions:
The dosimetric parameters for electron beams obtained experimentally with MAGIC-f and with PENELOPE code showed similar results to the clinical data. From the results it can be inferred that MAGIC-f can be used as a complementary dosimetric tool for electron beams due to its characteristics of high spatial resolution and the ability to construct tridimensional dose distributions. Also PENELOPE can be used to study MAGIC-f gel response in electron beams.


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