Small field size dose-profile measurements using gel dosimeters, gafchromic films and micro-thermoluminescent dosimeters

Wong, Christopher J.; Ackerly, Trevor; He, Chao; Patterson, William R.; Powell, Clem E.; Qiao, Greg G.; Meder, Roger; Geso, Moshi

doi:10.1016/j.radmeas.2009.03.012

Cited by 25 publications

(26 citation statements)

References 31 publications

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“…To improve accuracy of treatment planning systems (TPS), determining of exact dosimetry is essential (3) . The dosimetric parameters required for commissioning and quality assurance of treatment planning systems include output factor (OF), off-axis ratio (OAR), and percentage depth dose (PDD) (4,5) .…”

Section: Introductionmentioning

confidence: 99%

“…These dosimeters don't perturb radiation ield because the material phantom and these detector are the same (10) . Because of these bene its several studies in radiation small ields have been accomplished by using several types of polymer gel dosimeter (3,7,(11)(12)(13)(14) but the MRI-based on MAGIC polymer gel dosimeter has not been evaluated for small ields. It is well recognized that effect of a gel is different from others; even a change in component of a unique gel causes a different response to absorbed dose.…”

Section: Introductionmentioning

confidence: 99%

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Evaluation of MRI-based MAGIC polymer gel dosimeter in small photon fields

Parwaie¹,

Yarahmadi²,

Nedaie³

et al. 2016

IJRR

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Background: Accurate small radia on field dosimetry is essen al in modern radiotherapy techniques such as stereotac c radiosurgery (SRS) and intensity modulated radiotherapy (IMRT). Precise measurement of dosimetric parameters such as beam profile, percentage depth doses and output factor of these beams are complicated due to the electron disequilibrium and the steep dose gradients. In the present work the MAGIC polymer gel was used for dosimetry of small circular photon beams. The results of MAGIC were compared with EBT2 measurements and Monte Carlo (MC) calcula ons. Materials and Methods: Experimental measurements were made by men oned dosimeters in four small field sizes 5, 10, 20 and 30 mm. The BEAMnrc code based on EGSnrc was used for simula on to calculate dosimetric parameters at these small fields. The phantoms were irradiated in a 6 MV photon beam Varian 2100C linear accelerator at SSD=100 cm. gel readout performed by 3 Tesla MRI scanner. Results: The results showed that the Percent depth dose (PDD) values measured and calculated by EBT2 film and MC had maximum local differences 4% and 5% with PDD values measured by MAGIC for field size of 5mm respec vely. These differences decreased for larger field sizes. The measurements of output factor and penumbra (80%-20%) and (90%-10%) showed good agreement between the measurements and MC calcula on. Conclusion: This study showed that the MAGIC polymer gel based on high resolu on MRI images is useful detector for small field dosimetry but its agreement with MC is less than agreement of EBT2 film with MC.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Evaluation of MRI-based MAGIC polymer gel dosimeter in small photon fields

Parwaie¹,

Yarahmadi²,

Nedaie³

et al. 2016

IJRR

View full text Add to dashboard Cite

show abstract

“…Other complication is the perturbation of the level of disequilibrium, which is inducted bye the dosimeter when introduced in the track of the radiation fields. Thus, due these characteristics of the small fields, an accurate dose verification of the delivery dose of the small radiation fields is required [42][43][44][45].…”

Section: Dose-distribution Of Small Fields Through the Magic-f Dosimementioning

confidence: 99%

3D Dosimetric Tools in Radiotherapy for Photon Beams

Alva-Sánchez¹,

Pianoschi²

2013

Frontiers in Radiation Oncology

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“…The literature has presented several types of photon detectors suitable for large and small field size dosimetry, such as ionization chambers, diodes, films, TLD and 3D gel dosimeters [2][3][4][5]. In this work we investigated the beam parameters related to photon beam for different field sizes using the chemical Fricke dosimeter and a cylindrical PTW 30013 0.6 cm 3 ionization chamber (IC).…”

Section: Introductionmentioning

confidence: 99%

A standard Fricke dosimeter compared to an ionization chamber used for dosimetric characterization of ⁶⁰Co photon beam

Moussous

Medjadj

2016

Polish Journal of Medical Physics and Engineering

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The main objective of this study was to investigate the Fricke dosimeter water equivalent system for measurement of dosimetric parameters for photon beam. The parameters measured with the Fricke dosimeter were compared to those obtained with an ionization chamber. In this work characteristics for 60 Co γ-rays of field sizes ranging from 5 × 5 cm 2 to 20 × 20 cm 2 are reported. The measurements were carried out in the secondary standard dosimetry laboratory using a collimated 60 Co gamma source therapy unit. The 60 Co beam output in terms of absorbed dose to water was obtained as per IAEA TRS 398 recommendations using cylindrical ionization chamber, whose N D,w has been supplied by the IAEA's reference laboratory. Specific quantities measured include: output factors, peak scatter factor, lateral beam profiles and percentage depth dose. The Fricke dosimeters were irradiated in a water phantom using the suitable poly (methyl methacrylate), PMMA stand. Our results demonstrate that Fricke dosimeter and ionization chamber agree with each other.

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Small field size dose-profile measurements using gel dosimeters, gafchromic films and micro-thermoluminescent dosimeters

Cited by 25 publications

References 31 publications

Evaluation of MRI-based MAGIC polymer gel dosimeter in small photon fields

Evaluation of MRI-based MAGIC polymer gel dosimeter in small photon fields

3D Dosimetric Tools in Radiotherapy for Photon Beams

A standard Fricke dosimeter compared to an ionization chamber used for dosimetric characterization of ⁶⁰Co photon beam

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Small field size dose-profile measurements using gel dosimeters, gafchromic films and micro-thermoluminescent dosimeters

Cited by 25 publications

References 31 publications

Evaluation of MRI-based MAGIC polymer gel dosimeter in small photon fields

Evaluation of MRI-based MAGIC polymer gel dosimeter in small photon fields

3D Dosimetric Tools in Radiotherapy for Photon Beams

A standard Fricke dosimeter compared to an ionization chamber used for dosimetric characterization of 60Co photon beam

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A standard Fricke dosimeter compared to an ionization chamber used for dosimetric characterization of ⁶⁰Co photon beam