Radiochromic film is superior to ion chamber arrays for IMRT quality assurance

Dević, Slobodan; McEwen, M; Orton, Colin G.

doi:10.1118/1.3298377

Cited by 4 publications

(7 citation statements)

References 15 publications

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“…The ionization chamber is stable, reliable, easy to calibrate, accurate, shows long term stability and linearity with dose, capable of infinite repeatability and also provide integral and instantaneous doses. 2 Ionization chambers work on the basis of cavity theory. CPE has to be satisfied in order for cavity theory to work.…”

Section: Ion Chambermentioning

confidence: 99%

“…24,25 These features of the film may prove film to be superior to pinpoint chambers in very small lesions, especially for volumetric fluence modulation techniques, where overlapping penumbral regions may be a challenging aspect for ion chambers. 2 The film comes with certain disadvantages.…”

Section: Ebt3 Filmmentioning

confidence: 99%

“…Multiple films are required to yield uncertainties less than 1%. 2 Image formation in radiochromic films occurs as a polymerization process of photo-monomers when energy is transferred from either photons or electrons. These films are self-developing and do not require latent chemical, optical or thermal development.…”

Section: Ebt3 Filmmentioning

confidence: 99%

“…These small fields have high dose gradients, small spatial regions, and accompanying penumbra. 2 IMRT adds up small dose distributions in non-equilibrium conditions to treat large volumes using optimization routines. 3 Hence, uncertainty with beamlet-based treatment is a major concern when the width of the individual beamlet is smaller than 2 cm.…”

Section: Introductionmentioning

confidence: 99%

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Point dose verification of Cranial Stereotactic Radiosurgery using micro Ionization Chamber and EBT3 film for 6MV FF and FFF beams in Varian TrueBeam^® LINAC

Mamballikalam

Senthilkumar

Ahamed

et al. 2020

Polish Journal of Medical Physics and Engineering

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Introduction: Achieving high positional and dosimetric accuracy in small fields is very challenging due to the imbalance of charged particle equilibrium (CPE), occlusion of the primary radiation source, and overlapping penumbra regions. These factors make the choice of the detector for Stereotactic Radiosurgery (SRS) patient-specific quality assurance (PSQA) difficult. The aim of the study is to compare the suitability of EBT3 Gafchromic film against CC01 pinpoint chamber for the purpose of SRS and stereotactic Radiotherapy (SRT) dose verification.Material and Method: EBT3 Gafchromic film was calibrated against Treatment Planning System (TPS) doses (1 Gy – 35 Gy). CC01 pinpoint chamber and EBT3 film was used to verify Patient-Specific point doses of 21 intracranial lesions each planned with Static, Dynamic Conformal Arc (DCA), and Volumetric Arc Therapy (VMAT) using Varian TrueBeam Accelerator 6MV Flattening Filter (FF) and 6MV Flattening Filter Free (FFF) beams. The lesion sizes varied from 0.4 cc to 2.9 cc. The lesions were categorized into <1cc, 1cc-2cc and 2cc-3cc.Results: High variations in measured doses from TPS calculated dose were observed with small lesion volumes irrespective of the dosimeter. As the sizes decreased high uncertainty was observed in ion chamber results. CC01 was observed under-responding to film in small lesion sizes (<1cc), where nearly 50% of results under-responded in comparison with Film results. Film results were more or less consistent for static and DCA plans. Static and DCA plans were consistent passing more than 73% of the plans of the smallest lesion size category. VMAT showed very poor PSQA agreement for all three volumes (32.1% for <1cc, 14.3% for 2cc-3cc and 39.3% for 2cc-3cc). No significant difference was observed between 6MVFF and 6MVFFF beams from the chi-squared test.Conclusion: EBT3 Film was observed to be a more suitable detector for small lesion sizes less than 1cc, compared to CC01. As the volume increases, the response of CC01 and EBT3 film have no significant difference in performing PSQA for intracranial SRS/SRT. VMAT techniques for intra cranial SRS shows deviation from TPS planned dose for both EBT3 film and CC01 and should not be preferred choice of verification tools.

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Section: Ion Chambermentioning

confidence: 99%

Section: Ebt3 Filmmentioning

confidence: 99%

Section: Ebt3 Filmmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Point dose verification of Cranial Stereotactic Radiosurgery using micro Ionization Chamber and EBT3 film for 6MV FF and FFF beams in Varian TrueBeam^® LINAC

Mamballikalam

Senthilkumar

Ahamed

et al. 2020

Polish Journal of Medical Physics and Engineering

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“…EBT – ISP Corporation) for high resolution two-dimensional dosimetry. EBT films are near-tissue equivalent, structurally rugged, do not require developing nor show signs of sensitivity to room light or dose-rate [1]. These films also have the same high-resolution as their radiographic predecessors and can be digitized with flatbed scanners.…”

Section: Introductionmentioning

confidence: 99%

A 'quad-phantom' film dosimeter for use as a multi-planar verification tool for PRESAGE/optical-CT

Stunja¹,

Thomas²,

Adamovics³

et al. 2010

J. Phys.: Conf. Ser.

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Introduction To develop and characterize the accuracy and reproducibility of a quad-phantom dosimeter which will serve as an independent verification tool during commissioning of a PRESAGE/optical-CT 3D dosimetry system. Methods A 16cm × 12cm cylindrical quad-phantom was constructed from four pieces of solid polyurethane mimicking the PRESAGE material. Films were placed and anchored in orthogonal planes and the quad-phantom was fastened tightly together and placed in a water-filled Styrofoam container for irradiation. A simple, two-field plan consisting of 6×6cm anterior-posterior and right-lateral 6MV photon beams (400cGy) was delivered three times (fresh films inserted for each) with a Varian Clinac 600C. Image registration was performed in the Computational Environment for Radiological Research (CERR) and dose profiles and gamma analysis was performed in CERR and MATLAB. Results & Discussion Excellent reproducibility was observed during the irradiations, with ~2.3% standard deviation between all pixels. Using a 3%, 3mm gamma criteria, excellent dosimetric accuracy was observed, with 98.8% and 96.3% passing rates in the sagittal and axial planes, respectively. Conclusion The preliminary results indicate that the quad-phantom can serve as a reproducible and accurate system for high resolution dosimetry in orthogonal planes and should serve as an effective verification tool for PRESAGE/optical-CT in more challenging clinical scenarios.

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A high-resolution 3D radiochromic hydrogel photonic crystal dosimeter for clinical radiotherapy

Wang,

Chen,

Wang

et al. 2025

Mater. Horiz.

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Radiochromic film is superior to ion chamber arrays for IMRT quality assurance

Cited by 4 publications

References 15 publications

Point dose verification of Cranial Stereotactic Radiosurgery using micro Ionization Chamber and EBT3 film for 6MV FF and FFF beams in Varian TrueBeam^® LINAC

Point dose verification of Cranial Stereotactic Radiosurgery using micro Ionization Chamber and EBT3 film for 6MV FF and FFF beams in Varian TrueBeam^® LINAC

A 'quad-phantom' film dosimeter for use as a multi-planar verification tool for PRESAGE/optical-CT

A high-resolution 3D radiochromic hydrogel photonic crystal dosimeter for clinical radiotherapy

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Radiochromic film is superior to ion chamber arrays for IMRT quality assurance

Cited by 4 publications

References 15 publications

Point dose verification of Cranial Stereotactic Radiosurgery using micro Ionization Chamber and EBT3 film for 6MV FF and FFF beams in Varian TrueBeam® LINAC

Point dose verification of Cranial Stereotactic Radiosurgery using micro Ionization Chamber and EBT3 film for 6MV FF and FFF beams in Varian TrueBeam® LINAC

A 'quad-phantom' film dosimeter for use as a multi-planar verification tool for PRESAGE/optical-CT

A high-resolution 3D radiochromic hydrogel photonic crystal dosimeter for clinical radiotherapy

Contact Info

Product

Resources

About

Point dose verification of Cranial Stereotactic Radiosurgery using micro Ionization Chamber and EBT3 film for 6MV FF and FFF beams in Varian TrueBeam^® LINAC

Point dose verification of Cranial Stereotactic Radiosurgery using micro Ionization Chamber and EBT3 film for 6MV FF and FFF beams in Varian TrueBeam^® LINAC