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Dose enhancement in bone in electron beam therapy.

S C Prasad, T E Ames, T B Howard

|May 1, 1984

Summary

Electron beam therapy can increase radiation dose to bone tissue, potentially causing injury. This study quantifies dose enhancement in bone during electron beam radiation, highlighting risks in clinical applications.

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Area of Science:

Medical Physics
Radiation Oncology
Radiotherapy Dosimetry

Background:

Bone tissue exhibits different electron density compared to surrounding soft tissues.
Accurate dose calculation in bone is crucial for effective radiotherapy planning.
Electron beam therapy is used for treating various cancers, often near bone structures.

Purpose of the Study:

To investigate and quantify the dose enhancement in bone tissue during electron beam therapy.
To assess the impact of different electron beam energies on bone dose.
To evaluate the clinical implications of dose deposition in bone during radiotherapy.

Main Methods:

Measurements using films and thermoluminescent dosimeters in polystyrene phantoms with bone inhomogeneity.

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Utilized electron beam energies of 15-MeV, 12-MeV, and 9-MeV.

Inclusion of phantoms with simulated bone and actual mandibular bone and teeth.

Main Results:

Dose increase in bone material (electron density 1.73) ranged from 11% to 18% across tested electron energies.
Dose enhancement in mandibular bone (electron density 1.60) was approximately 10% (15-MeV) and 7% (9-MeV).
Observed dose increases are relative to the dose in the surrounding polystyrene phantom material.

Conclusions:

Electron beam therapy can lead to significant dose enhancement in bone tissue.
The findings suggest a potential risk of bone injury in clinical scenarios involving high-dose electron therapy.
Accurate dosimetry and treatment planning are essential to mitigate potential bone damage during radiotherapy.