Investigation of Dose Calculation Accuracy of Eclipse Treatment Planning System in the Presence of Metal Hip Prosthesis with Thermoluminescence Dosimeters

Abstract

Aim: This study investigated the dose calculation accuracy of different treatment planning algorithms used in radiotherapy patients with hip prostheses. Method: The current research produced a tissue-equivalent cylindrical phantom that imitates a leg using a 3D printer. Co-Cr-Mo alloy and Ti-6AI-4V alloy prostheses were placed in the centre of the phantom, respectively. Both prostheses' dose measurements were taken with thermoluminescent dosimeters (TLD) at 92 points. The dose calculation accuracy of the Analytical Anisotropic Algorithm (AAA) and Pencil Beam Convolution (PBC) algorithms, widely used in radiotherapy, were compared with the measurement results. Results: Since the Co-Cr-Mo hip prosthesis has a high density, the number of backscattered photons around it was higher than the Ti-6AI-4V hip prosthesis. The average surface dose of the Co-Cr-Mo alloy was 364.05 cGy, while the average surface dose of the Ti-6AI-4V alloy was 347.79 cGy. Conclusion: It was observed that the dose estimation abilities of the AAA and PBC algorithms decreased as the density of the hip replacement increased. In addition, the AAA algorithm predicted the surface dose in the phantom better than the PBC algorithm.

Keywords

• Hip prosthesis
• radiotherapy
• thermoluminescent dosimetry
• algorithms

Supporting Institution

Selcuk University

Project Number

21401102

Ethical Statement

This study was supported by the Scientific Research Projects (BAP) Grants Unit, Selcuk University, Konya, TURKEY [Grant Number: 21401102].

Metal Kalça Protezi Varlığında Eclipse Tedavi Planlama Sisteminin Doz Hesaplama Doğruluğunun Termolüminesans Dozimetreler ile Araştırılması

Abstract

Amaç: Bu çalışmada kalça protezi olan radyoterapi hastalarında kullanılan farklı tedavi planlama algoritmalarının doz hesaplama doğruluğu araştırıldı. Yöntem: Bu çalışmada 3D yazıcı kullanılarak bacağı taklit eden doku eşdeğeri silindirik bir fantom üretildi. Fantomun merkezine sırasıyla Co-Cr-Mo alaşımı ve Ti-6AI-4V alaşımı protezler yerleştirildi. Her iki protezin doz ölçümleri 92 noktada termolüminesan dozimetreler (TLD) ile alınmıştır. Radyoterapide yaygın olarak kullanılan Analitik Anizotropik Algoritma (AAA) ve Pencil Beam Convolution (PBC) algoritmalarının doz hesaplama doğruluğu ölçüm sonuçları ile karşılaştırıldı. Bulgular: Co-Cr-Mo kalça protezi yüksek yoğunluğa sahip olduğundan, etrafına geri saçılan foton sayısı Ti-6AI-4V kalça protezinden daha yüksekti. Co-Cr-Mo alaşımının ortalama yüzey dozu 364.05 cGy iken, Ti-6AI-4V alaşımının ortalama yüzey dozu 347.79 cGy idi. Sonuç: AAA ve PBC algoritmalarının doz tahmin yeteneklerinin kalça protezinin yoğunluğu arttıkça azaldığı gözlendi. Ayrıca AAA algoritması fantomdaki yüzey dozunu PBC algoritmasına göre daha iyi tahmin etti.

Keywords

• Kalça protezi
• radyoterapi
• termolüminesan dozimetri
• algoritmalar

Project Number

21401102

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