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Comparison between Clinically Used Irregular Fields Shielded by Cerrobend and Standard Lead Blocks.

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Summary

Cerrobend and lead block shielding methods show no significant differences in central axis dose distribution for photon beam radiation therapy. Both methods are effective for protecting normal tissues in head and neck cancer patients.

Keywords:
CerrobendDosimetryLead blockRadiation therapyShieldTLD dosimetry

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Area of Science:

  • Medical Physics
  • Radiation Oncology
  • Radiotherapy Dosimetry

Background:

  • Normal tissue protection in radiation therapy typically uses Cerrobend or lead block shielding.
  • This study investigates the impact of these shielding methods on photon beam dose distribution from a Cobalt unit under clinical conditions.

Purpose of the Study:

  • To compare the effectiveness of Cerrobend and lead block shielding in radiation therapy.
  • To evaluate the influence of these shielding methods on central axis dose distribution.

Main Methods:

  • Measurements were conducted using 60Co gamma-ray beams.
  • Cerrobend blocks were fabricated from commercial materials, and lead blocks were standard Cobalt unit shields.
  • Data was collected using a calibrated ionization chamber, relative dosimetry systems, and TLD dosimetry.

Main Results:

  • Percent depth dose (PDD) measurements for various field sizes showed no significant differences between lead and Cerrobend shielding.
  • Absolute dosimetry measurements at different depths also revealed no significant differences between the two shielding methods.
  • TLD dosimetry on patient skin yielded consistent results, indicating no significant difference in skin dose.

Conclusions:

  • Cerrobend and lead block shielding methods demonstrate comparable efficacy in radiation therapy.
  • Both shielding techniques are suitable for protecting normal tissues without compromising dose distribution.
  • Melt shielding techniques, like Cerrobend, offer an easy and fast shield fabrication method with equivalent dosimetric outcomes to lead blocks.