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Three-dimensional treatment planning for maxillary cancer using a CT simulator

Y Nagata¹, K Okajima, R Murata

¹Department of Radiology, Kyoto University Hospital, Japan.

International Journal of Radiation Oncology, Biology, Physics

|November 15, 1994

Summary

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Three-dimensional treatment planning using computed tomography simulators improved radiation therapy for maxillary cancer. This method reduced radiation field size and decreased complications like vision loss compared to older techniques.

Area of Science:

Radiation Oncology
Medical Imaging
Cancer Treatment

Background:

Maxillary cancer treatment traditionally used 2D planning.
Advancements in imaging technology prompted evaluation of new planning methods.

Purpose of the Study:

To evaluate the efficacy of 3D treatment planning using computed tomography (CT) simulators for maxillary cancer.
To compare outcomes between 2D and 3D planning techniques.

Main Methods:

Retrospective analysis of 83 maxillary cancer patients (1979-1992).
Group 1: X-ray simulator and plain films (n=25).
Group 2: X-ray simulator and CT films (n=34).
Group 3: CT simulator (n=24).
Increasing proportion of Stage IV disease from Group 1 to Group 3.

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Main Results:

Average radiation field size decreased from Group 1 (72.9 cm²) to Group 3 (66.5 cm²).
Lens radiation dose on the affected side decreased significantly in Group 3 (13%) vs. Groups 1 & 2 (44%).
Reduced long-term visual activity decrease in Group 3 (11%) compared to Group 2 (32%) and Group 1 (44%).

Conclusions:

Three-dimensional treatment planning with CT simulators offers superior outcomes for maxillary cancer.
3D planning leads to reduced radiation field size and fewer treatment-related complications.
This approach enhances patient safety and treatment effectiveness.