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Multi-parametric fit method in reconstruction of brachytherapy needles
1Petz County Teaching Hospital, Gyor, Department of Oncoradiology, Zrinyi str.13, H-9002 Gyor, Pf. 92, Hungary. palvolgyij@petz.gyor.hu
Purpose:
To adapt the multi-parametric fit method to reconstruct brachytherapy needles inserted with free hand technique for treatment of surface malignancies.
Methods:
An alternative reconstruction method for brachytherapy (BT) needles is presented. The method is based on the digitized tip and end coordinates on pairs of posterior-anterior and posterior-oblique reconstruction images obtained with a non-isocentric C-arm. The needles tip and end coordinates are computed with the multi-parametric fit method that also incorporates the determination of the magnification factors of the reconstruction images. We tested the reconstruction accuracy with radio-opaque markers inserted into known positions. The range of C-arm angles that resulted in an accurate reconstruction was also investigated. We applied the method in treatments of the vulvar cancer using 3 to 5 pieces of BT needles located in a distance of approximately 1 cm.
Results:
The phantom test showed largest difference between the reconstructed and expected distance between the simulated needles ±1.3 mm. In vulvar insertions, the reconstructed position of the BT needles obtained with different image pairs agreed within 3 mm.
Conclusion:
The reconstruction accuracy of the multi-parametric fit method in with proper imaging is suitable for the clinical use.
