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Purpose <p>Two-dimensional (2D) detector arrays are commonly used for patient-specific quality assurance (PSQA) in advanced radiotherapy. The steep dose gradients from multileaf collimator (MLC) beam modulations and dose rate variations from radiotherapy may affect PSQA measurement accuracy. This study aims to quantify the spatial dose performance of 2D detector arrays, focusing on its relevance to PSQA in advanced radiotherapy.</p> Methods <p>The Octavius Detector 1500 (PTW, Freiburg, Germany) was evaluated using a spatially varied dose map pattern delivered from a linac. The dose map measured by the detector was compared with the fluence maps constructed from the linac log data obtained during the delivery. A comparison was also made with the dose map obtained using a lower resolution Octavius Detector 729 and the gold standard radiochromic film.</p> Results <p>The resolution obtained from the dose profiles of the spatial dose pattern measured using the Octavius Detector 1500 was similar to that of the radiochromic film and linac log data, with a deviation within 4.5%. In contrast, the Octavius Detector 729 exhibited significantly larger errors, with deviations of up to 54.1%.</p> Conclusions <p>The Octavius Detector 1500 demonstrated spatial dose performance for PSQA of advanced radiotherapy that is comparable to the performance of radiochromic film. The integration of log data analysis provides a high-resolution approach for verifying the measurement accuracy.</p>

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Spatial resolution characterisation of 2D ionisation chamber detector array using linac log data

  • 期刊论文

  • 发表日期：

    2025年4月29日

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  • Kai Wei Chuah,
  • Gokula Kumar Appalanaido,
  • A. T. Abdul Rahman,
  • Hafiz M. Zin

摘要

Purpose

Two-dimensional (2D) detector arrays are commonly used for patient-specific quality assurance (PSQA) in advanced radiotherapy. The steep dose gradients from multileaf collimator (MLC) beam modulations and dose rate variations from radiotherapy may affect PSQA measurement accuracy. This study aims to quantify the spatial dose performance of 2D detector arrays, focusing on its relevance to PSQA in advanced radiotherapy.

Methods

The Octavius Detector 1500 (PTW, Freiburg, Germany) was evaluated using a spatially varied dose map pattern delivered from a linac. The dose map measured by the detector was compared with the fluence maps constructed from the linac log data obtained during the delivery. A comparison was also made with the dose map obtained using a lower resolution Octavius Detector 729 and the gold standard radiochromic film.

Results

The resolution obtained from the dose profiles of the spatial dose pattern measured using the Octavius Detector 1500 was similar to that of the radiochromic film and linac log data, with a deviation within 4.5%. In contrast, the Octavius Detector 729 exhibited significantly larger errors, with deviations of up to 54.1%.

Conclusions

The Octavius Detector 1500 demonstrated spatial dose performance for PSQA of advanced radiotherapy that is comparable to the performance of radiochromic film. The integration of log data analysis provides a high-resolution approach for verifying the measurement accuracy.