Simple range measurement of therapeutic ion beams using visible rays generated in a bare plastic scintillator block

Fukumura, Akifumi; Noda, Yutaka; Omata, K.; Hiraoka, Takeshi; Futami, Yasuyuki; Matsufuji, Naruhiro; Murakami, T.; Kanai, Tatsuaki

doi:10.1016/s0168-9002(98)00560-9

Cited by 7 publications

(6 citation statements)

References 7 publications

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“…The plastic scintillator and CCD camera system has been developed for use in heavy ion beam and proton beam range measurement. ( 11 – 12 ) We applied a method previously used for a particle beam to quantitatively acquire HDR

{}^{192}{normalI} r

source information.…”

Section: Introductionmentioning

confidence: 99%

New method for obtaining position and time structure of source in HDR remote afterloading brachytherapy unit utilizing light emission from scintillator

Kojima

Hanada

Katsuta

et al. 2009

J Applied Clin Med Phys

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When using a HDR remote afterloading brachytherapy unit, results of treatment can be greatly influenced by both source position and treatment time. The purpose of this study is to obtain information on the source of the HDR remote afterloading unit, such as its position and time structure, with the use of a simple system consisting of a plastic scintillator block and a charge‐coupled device (CCD) camera. The CCD camera was used for recording images of scintillation luminescence at a fixed rate of 30 frames per second in real time. The source position and time structure were obtained by analyzing the recorded images. For a preset source‐step‐interval of 5 mm, the measured value of the source position was 5.0±1.0.2emmm, with a pixel resolution of 0.07 mm in the recorded images. For a preset transit time of 30 s, the measured value was 30.0±0.6 s, when the time resolution of the CCD camera was 1/30 s. This system enabled us to obtain the source dwell time and movement time. Therefore, parameters such as normalI192r source position, transit time, dwell time, and movement time at each dwell position can be determined quantitatively using this plastic scintillator‐CCD camera system.PACS number: 87.53.Jw

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{}^{192}{normalI} r

source information.…”

Section: Introductionmentioning

confidence: 99%

New method for obtaining position and time structure of source in HDR remote afterloading brachytherapy unit utilizing light emission from scintillator

Kojima

Hanada

Katsuta

et al. 2009

J Applied Clin Med Phys

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“…This method has previously been used for measuring the range of proton and carbon particles and also for QA in brachytherapy and diagnostic computed tomography. (22)(23)(24)(25)(26)(27)(28)(29)(30) We investigated combining these simple devices to measure a complex IMRT field, and also examined the feasibility of using this as a tomotherapy QA technique.…”

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confidence: 99%

Investigation of the feasibility of a simple method for verifying the motion of a binary multileaf collimator synchronized with the rotation of the gantry for helical tomotherapy

Hashimoto

Uematsu

Ito

et al. 2012

J Applied Clin Med Phys

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In this paper, we suggest a new method for verifying the motion of a binary multileaf collimator (MLC) in helical tomotherapy. For this we used a combination of a cylindrical scintillator and a general‐purpose camcorder. The camcorder records the light from the scintillator following photon irradiation, which we use to track the motion of the binary MLC. The purpose of this study is to demonstrate the feasibility of this method as a binary MLC quality assurance (QA) tool. First, the verification was performed using a simple binary MLC pattern with a constant leaf open time; secondly, verification using the binary MLC pattern used in a clinical setting was also performed. Sinograms of simple binary MLC patterns, in which leaves that were open were detected as “open” from the measured light, define the sensitivity which, in this case, was 1.000. On the other hand, the specificity, which gives the fraction of closed leaves detected as “closed”, was 0.919. The leaf open error identified by our method was −1.3±7.5%. The 68.6% of observed leaves were performed within ± 3% relative error. The leaf open error was expressed by the relative errors calculated on the sinogram. In the clinical binary MLC pattern, the sensitivity and specificity were 0.994 and 0.997, respectively. The measurement could be performed with −3.4±8.0% leaf open error. The 77.5% of observed leaves were performed within ± 3% relative error. With this method, we can easily verify the motion of the binary MLC, and the measurement unit developed was found to be an effective QA tool.PACS numbers: 87.56.Fc, 87.56.nk

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“…The plastic scintillator is water-equivalent with a density close to 1.0 g cm −3 and consists of hydrogen and carbon. Therefore, it is expected that the range in a plastic scintillator can be converted to that in water with a minor correction (Fukumura et al 1998). The minor correction is only one conversion factor.…”

Section: Range Measurement Toolmentioning

confidence: 99%

“…Several methods for proton beam dosimetry have been developed: a scintillating-screen (Boon et al 1998(Boon et al , 2000, small scintillator and optical fibre (Sarios et al 2004) and a film (Daftari et al 1999, Piermattei et al 2000. A range measurement method for a heavy ion beam has been developed (Fukumura et al 1998), which consists of a plastic scintillator that has a very fast response and a charge-coupled device (CCD) camera, and can measure the range from the image recorded by the CCD camera. This method reduces the beam time for measurement of the range.…”

Section: Introductionmentioning

confidence: 99%

Development of an easy-to-handle range measurement tool using a plastic scintillator for proton beam therapy

Fukushima¹,

Hamada²,

Nishio³

et al. 2006

Phys. Med. Biol.

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Proton beam therapy can concentrate the dose on a tumour. In order to offer high-precision proton beam therapy to the patient, it is important to confirm the range every day. At the National Cancer Center Hospital East (NCC), the range measurement tool consists of a water phantom and an ionization chamber. These large and heavy tools take a long time to set up. Therefore, we developed a simple and easy-to-handle range measurement tool for proton beam therapy. This tool consists of a plastic scintillator block and a CCD camera. We recorded visible scintillation light generated by proton irradiation on the scintillator, and could measure the range from the shape of light distribution by using a computer with automatic analysis software installed. We carried out proton irradiation experiments with this tool to examine its performance as a tool of daily range measurements. The precision of the range measurement is within 0.3 mm (sd). The tool can measure possible short-term range variation with 1 s sampling time during the time interval of a typical treatment in a few minutes. We conclude that this tool can measure the range with sufficient resolution in a short time, and is useful for range control in a clinical setting.

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Simple range measurement of therapeutic ion beams using visible rays generated in a bare plastic scintillator block

Cited by 7 publications

References 7 publications

New method for obtaining position and time structure of source in HDR remote afterloading brachytherapy unit utilizing light emission from scintillator

New method for obtaining position and time structure of source in HDR remote afterloading brachytherapy unit utilizing light emission from scintillator

Investigation of the feasibility of a simple method for verifying the motion of a binary multileaf collimator synchronized with the rotation of the gantry for helical tomotherapy

Development of an easy-to-handle range measurement tool using a plastic scintillator for proton beam therapy

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