Baş Plaka Fantomunda Kullanılan Biyomalzemelerde Oluşan İkinci Pikin Proton Bragg Pikine Etkisi

Yıl 2020, , 129 - 136, 01.03.2020

Mustafa Hicabi Bölükdemir , Fatih Ekinci

https://doi.org/10.2339/politeknik.523001

Cited By: 4

Öz

Bu çalışmada Monte Carlo benzetimi
ile biyomalzemeli baş plaka fantomunda terapötik enerji aralığında kalan
160-220 MeV’lik protonların Bragg eğrileri hesaplanmıştır. Biyomalzeme olarak
Ti₆Al₄V, Co-Ni-Cr-Mo, Al₂O₃,
Paslanmaz Çelik, Nital, Vitallium ve Teflon seçilmiş, biyomalzeme türünün ve kalınlığının
Bragg eğrisi üzerine etkisi incelenmiştir. Protonlar az yoğundan daha yoğun bir
katmana geçerken Bragg eğrisinde ikinci bir pik oluşur. Baş-plaka fantomunda
ikinci pik ve genliğinin Bragg piki üzerine etkisi de incelenmiştir. Kortikal
kemik kalınlığı arttıkça Bragg piki konumunun % 0,47-3,3 arasında azaldığı
görülmüştür. Proton enerjisi arttıkça ikinci pikin genliğinin ve Bragg pik
konumuna etkisinin azaldığı görülmüştür. Kullanılan biyomalzemeler içerisinde
kortikal kemiğe en yakın biyomalzemenin teflon olduğu tespit edilmiştir.

Anahtar Kelimeler

Proton tedavi, biyomalzeme, bragg piki, baş plaka fantomu

The Effect of the Second Peak formed in Biomaterials used in a Slab Head Phantom on the Proton Bragg Peak

Öz

In this study, Bragg curves of 160-220 MeV protons in
the therapeutic energy range were calculated with Monte Carlo simulation. Ti₆Al₄V,
Co-Ni-Cr-Mo, Al₂O₃, Stainless Steel, Nital, Vitallium and
Teflon were selected as biomaterials and the effect of biomaterial type and
thickness on Bragg curve was investigated. A second peak is formed when protons
pass from a less dense to a denser layer. The effect of the second peak and
amplitude on the Bragg peak is also investigated in the slab head phantom. It
has been seen that as the cortical bone thickness increases, the Bragg peak
position decreases by 0.47-3.3%. As the proton energy increased, the amplitude
of the second peak and the effect of the Bragg peak position decreased. The
biomaterial which gives the closest results to the cortical bone among the
biomaterials used was found to be Teflon.

Anahtar Kelimeler

Proton therapy, biomaterial, bragg peak, slab head phantom

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