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Stereotactic Radiosurgery for Gynecologic Cancer

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Published on: April 17, 2012

Elekta Precise Table characteristics of IGRT remote table positioning.

Hans L Riis¹, Sune J Zimmermann

¹Radiofysisk Laboratorium, Odense University Hospital, Odense C, Denmark. hans.lynggaard.riis@ouh.regionsyddanmark.dk

Acta Oncologica (Stockholm, Sweden)

|August 30, 2008

Summary

A new method accurately characterizes radiotherapy patient table positioning, ensuring high precision image-guided radiation therapy (IGRT). Reproducibility within 0.22 mm in lateral/longitudinal and 0.43 mm in vertical directions was achieved.

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Area of Science:

Medical Physics
Radiotherapy Technology
Image-Guided Interventions

Background:

Cone beam CT (CBCT) is crucial for patient positioning in radiotherapy.
Accurate patient table movement is essential for effective radiotherapy delivery.
Current methods require reliable systems for patient positioning verification.

Purpose of the Study:

To present a novel method for characterizing radiotherapy treatment table positioning.
To evaluate the reproducibility, linearity, and accuracy of table movements.
To ensure the reliability of patient positioning systems for image-guided radiation therapy (IGRT).

Main Methods:

Investigated table characteristics on Elekta Synergy Platforms with Precise Tables.
Utilized auto set-up (ASU) feature in linac control system software.
Employed high-precision rulers and a USB-microscope to measure table positions (vertical, lateral, longitudinal).
Simulated patient effects by applying external loads to the table top.

Main Results:

Demonstrated a linear relationship between linac control system readouts and measured table positions.
Observed reproducibility within a standard deviation of 0.22 mm (lateral/longitudinal) and 0.43 mm (vertical).
Identified effects of imperfect calibration on positioning accuracy.

Conclusions:

The presented method effectively characterizes radiotherapy treatment table positioning.
The findings confirm the suitability of the method for high-precision IGRT.
Knowledge of table positioning characteristics is vital for accurate XVI (imaging verification) procedures.