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Electronic Distance Measuring Instruments (EDMs) are essential tools in modern surveying, offering precise distance measurements by emitting electromagnetic signals and calculating the time required for these signals to travel to a target and return. Two primary types of signals are used in EDMs — light waves and microwaves — each suited to specific environmental and distance requirements. Light-wave-based EDMs utilize either infrared or laser light, providing high accuracy over short...
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Electron Channeling Contrast Imaging for Rapid III-V Heteroepitaxial Characterization
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Small field measurements using electronic portal imaging device.

A Aziz Sait1, S A Yoganathan2, Glenn W Jones3

  • 1Department of Physics, Faculty of Engineering, Teerthanker Mahaveer University, Moradabad, India.

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|June 21, 2024
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Summary

This study shows that Electronic Portal Imaging Devices (EPIDs) can accurately measure small radiation fields when using specific correction factors. These validated correction factors improve the precision of small-field dosimetry verification.

Keywords:
epidoutput factorpddprofilesquality assurancesmall fieldstereotactic

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Area of Science:

  • Medical Physics
  • Radiation Oncology
  • Dosimetry

Background:

  • Small-field radiation measurements are critical for modern radiotherapy but present significant challenges.
  • Electronic Portal Imaging Devices (EPIDs) offer high resolution but their use in small-field dosimetry is not well-established.

Purpose of the Study:

  • To evaluate the performance of EPID for small-field dosimetry.
  • To develop and validate tailored correction factors for precise small-field dosimetry verification using EPID.

Main Methods:

  • Compared EPID measurements with high-resolution detectors (plastic scintillators, microSilicon, microDiamond) for various beam energies and field sizes.
  • Measured output factors, depth doses, and profiles using a Varian Truebeam linear accelerator.
  • Derived and validated correction factors using statistical fitting and independent EPID measurements.

Main Results:

  • EPID showed deviations of 1-15% for output factors and 1-19% for depth doses compared to W2 plastic scintillator.
  • Profile analysis revealed maximum differences of 4% in the 100%-80% region.
  • Validated correction factors demonstrated close agreement within 3% on independent EPIDs.

Conclusions:

  • EPID is a viable tool for small-field dosimetry verification.
  • The derived correction factors enhance the accuracy of EPID-based small-field dosimetry.