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Partial lung shield for TBI

A Ho1, S Kishel, G Proulx

  • 1Henry Ford Hospital, Dept. of Radiation Oncology, Detroit, MI 48202, USA.

Medical Dosimetry : Official Journal of the American Association of Medical Dosimetrists
|December 24, 1998
PubMed
Summary
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This study details a method using alternating anterior and posterior lung blocks with a 4 MV linear accelerator to limit lung dose during radiation therapy. This technique effectively reduces lung exposure to approximately 73 cGy per fraction, ensuring patient safety.

Area of Science:

  • Radiation Oncology
  • Medical Physics

Background:

  • Accurate dose delivery is crucial in radiation therapy, especially for organs at risk like the lungs.
  • Lung dose determination can be complex due to varying tissue densities.

Purpose of the Study:

  • To describe and validate a method for limiting lung dose during radiation therapy using partial lung shielding.
  • To optimize treatment delivery by reducing the need for daily port films.

Main Methods:

  • Utilized an AP/PA setup with a 4 MV linear accelerator and a prescribed dose of 1000 cGy.
  • Employed alternating anterior and posterior lung blocks to reduce lung dose.
  • Determined optimal cerrobend shield thickness for desired transmission (approx. 73%).
  • Verified shield efficacy using diode measurements on patients.

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Main Results:

  • Open fields would deliver an average of 708 cGy to the lung without shielding.
  • The alternating lung block technique aims to limit lung dose to 10 Gy.
  • A cerrobend thickness of <1 cm provided ~65% transmission, approximating the target 73% broad beam transmission.

Conclusions:

  • The described method of constructing partial lung shields is effective in limiting lung dose.
  • This technique offers a practical approach to reduce lung exposure during radiation therapy.
  • The procedure is adaptable for different dose fractionation schedules.