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A modified 60C teletherapy unit for total body irradiation

C Dominique¹, L H Schwartz, J Lescrainier

¹Department of Radiation Oncology, Hôpital Tenon, Paris, France.

International Journal of Radiation Oncology, Biology, Physics

|November 1, 1995

Summary

This study modified a teletherapy unit for total body irradiation (TBI) using a vertical beam, offering a comfortable and reproducible patient position. This approach provides a cost-effective alternative to linear accelerators for TBI.

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Area of Science:

Radiation Oncology
Medical Physics

Background:

Total body irradiation (TBI) is a critical component of certain cancer treatments, often requiring specialized equipment.
Conventional TBI delivery methods can be complex and resource-intensive.

Purpose of the Study:

To describe the modification of a standard teletherapy unit for efficient total body irradiation (TBI) in a conventional treatment room.
To evaluate the feasibility and outcomes of TBI using a modified vertical beam setup.

Main Methods:

A standard 60Co teletherapy unit was modified with a vertical beam configuration, including elevation and a custom beam flattening filter.
Patients were treated in prone and supine positions to achieve uniform dose distribution.
Dose delivery protocols included single doses (10 Gy) and fractionated doses (12 Gy over 3 days).

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Main Results:

The modified unit achieved a large irradiation field (248 cm diameter at 210 cm) suitable for tall patients.
Dose distribution was comparable to that achieved with linear accelerators using side-lying patient positions.
The system allowed for comfortable, reproducible patient positioning and effective organ shielding.

Conclusions:

The modified teletherapy unit offers a practical and effective method for delivering total body irradiation (TBI).
This setup provides a comfortable and reproducible patient experience.
It represents a potentially less expensive and viable alternative to linear accelerators for TBI delivery.