Characterization of a 2D ionization chamber array for IMRT plan verification

Alashrah, Saleh; Kandaiya, S.; Yong, Sun; Cheng, Soon Keong

doi:10.1016/j.nima.2009.10.125

Cited by 10 publications

(10 citation statements)

References 12 publications

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“…The basic dosimetric properties of the 2D ionization chamber array I'mRT MatriXX investigated in this study were reported in a previous paper [7]. These tests included the location of the effective point of measurement, dose linearity, energy dependence, the start-up behavior of the I'mRT MatriXX, field size dependence, dose rate effect and the stability of the detector over time.…”

Section: Introductionmentioning

confidence: 94%

“…The background radiation was subtracted from the readings. The detector was exposed to levels above 1500 cGy and required an initial warm-up of 60 minutes for the detector readings to be stable [7]. The effective depth of the detector was taken from the manufacturer-specified value of 3.6 ± 0.1 mm.…”

Section: D Array I'mrt Matrixxmentioning

confidence: 99%

“…However these films are normally scanned after a 24 hour post-irradiation and the results are not immediately available [3,4]. 2D ionization chamber arrays have provided direct measurement of dose without frequent calibration, and the measurements are in real time [5][6][7].…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Depth dependence of the single chamber response function of the I’mRT MatriXX array in a 6 MV photon beam

Alashrah

Kandaiya

Lum

et al. 2013

Zeitschrift für Medizinische Physik

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Section: Introductionmentioning

confidence: 94%

Section: D Array I'mrt Matrixxmentioning

confidence: 99%

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Depth dependence of the single chamber response function of the I’mRT MatriXX array in a 6 MV photon beam

Alashrah

Kandaiya

Lum

et al. 2013

Zeitschrift für Medizinische Physik

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“…However, most literature about the influence of the radiation field size on the passing rate is limited to the effective measurement range of MatriXX. [17,18]…”

Section: Introductionmentioning

confidence: 99%

A study on the correlation between radiation field size and gamma index passing rate for MatriXX

et al. 2019

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This study aimed to analyze the influence of the radiation field size on the passing rate of the treatment planning system using MatriXX if the field irradiated the circuit. Two sets of static fields which were 10 cm and 30 cm in the left-right direction (X), and was 31 cm to 40 cm in gun-target direction (Y) were designed. In these fields, the gantry was 0 and the monitor units were 200 MU. Two plans from an esophagus carcinoma patient with a planning target volume of 86.4 cm 3 and a cervical carcinoma patient with a planning target volume (PTV) of 2094.1 cm 3 were chosen. The passing rates of these plans were gained without and with protecting the circuit area from lead alloys. The gamma analysis was used and the standard was set to 3%/3 mm. The verification passing rate decreased from 95.0% to 69.2% when X was 10 cm while Y increased from 31 cm to 40 cm. With the protection from low melting point lead alloys, the passing rate was from 96.2% to 89.6%. The results of the second set of plans without lead alloys were similar but the passing rate decreased more sharply. The passing rates of the 2 patients were 99.5% and 57.1%. With the protection of the lead alloys, their passing rates were 99.8% and 72.1%, respectively. The results showed that with the increase of the radiation field size in the Y direction, more areas were irradiated in the circuit, and the passing rate gradually decreases and dropped sharply at a certain threshold. After putting lead alloys above the circuit, the passing rate was much better in the static field but was still less than 90% in the second patient volumetric modulated arc therapy (VMAT) because the circuit was irradiate in other directions. In daily QA, we should pay attention to these patients with long size tumor.

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“…The dose distribution on the target can be additionally formed by modulating the intensity of each field used. Owing to the complexity of the technique, confirmation of the dose distribution is significant [4].…”

Section: Introductionmentioning

confidence: 99%

Comparison of dose accuracy between 2D array detectors and Epid for IMRT of nasopharynx cancer

Altiparmak¹,

Coban²,

Merih³

et al. 2017

AIP Conference Proceedings

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The aim of this study is to perform the dosimetric controls of nasopharynx cancer patient's intensity modulated radiation therapy (IMRT) treatment plans that generated by treatment planing system (TPS) with using two different equipments and also to make comparison in terms of their reliability and practicability. This study has been performed at Radiation Oncology Department, Medicine Faculty in Gaziosmanpasa University by using the VARIAN CLINAC DHX linear accelerator which is operated in the range of 6 MV. Selected 10 nasopharynx patients planned in TPS (Eclipce V13.0) and approved for treatment by medical physicists and radiation oncologists. These plans recalculated on EPID and mapcheck which are 2D dosimetric equipments to obtain dose maps. To compare these two dosimetric equipments gamma analysis method has been preferred. Achieved data is presented and discussed.

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Characterization of a 2D ionization chamber array for IMRT plan verification

Cited by 10 publications

References 12 publications

Depth dependence of the single chamber response function of the I’mRT MatriXX array in a 6 MV photon beam

Depth dependence of the single chamber response function of the I’mRT MatriXX array in a 6 MV photon beam

A study on the correlation between radiation field size and gamma index passing rate for MatriXX

Comparison of dose accuracy between 2D array detectors and Epid for IMRT of nasopharynx cancer

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