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Radiation techniques for head and neck tumors.

K Bratengeier¹, L Pfreundner, M Flentje

¹Department of Radiation Oncology, University of Wuerzburg, Josef-Schneider-Strasse 11, D-97080 Wuerzburg, Germany.

Radiotherapy and Oncology : Journal of the European Society for Therapeutic Radiology and Oncology

|August 6, 2000

Summary

This study introduces a new rotational radiation therapy technique for oro- and hypopharyngeal cancers. It improves dose homogeneity in the planning target volume (PTV) while sparing the spinal cord.

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Area of Science:

Radiation Oncology
Medical Physics
Cancer Treatment

Background:

Advanced oro- and hypopharyngeal carcinomas require precise radiation delivery.
Conforming radiation techniques aim to improve dose homogeneity within the target volume.
Lateral opposed fields are a standard technique but may have limitations in dose distribution.

Purpose of the Study:

To present a novel radiation technique combining advantages of conforming methods for oro- and hypopharyngeal carcinomas.
To enhance dose homogeneity within the target volume compared to lateral opposed fields.
To spare the spinal cord during radiation treatment.

Main Methods:

A rotational technique using standard linear accelerator equipment and planning software was developed.

Related Experiment Videos

Static lateral wedged fields were employed to compensate for dose deficits near the spine.

Dose distributions were planned and evaluated for 25 consecutive patients.

Main Results:

Conforming techniques yielded more homogeneous dose distributions than lateral opposed fields.
A standard deviation of 4.6% was achieved in the planning target volume (PTV).
95% of the PTV was covered by the 90% isodose, with maximal spinal cord dose limited to 45 Gy.

Conclusions:

A rotational radiation technique, feasible with standard equipment, improves target volume dose coverage.
The technique effectively spares the spinal cord.
The presented method demonstrates competitive dose distributions compared to advanced techniques.