Assessment of using electronic portal imaging device for analysing bolus material utilised in radiation therapy

Abstract

In this study, the feasibility of using electronic portal imaging device (EPID) as an analysing equipment for bolus material was evaluated in terms of its dosimetric parameters. Seven superflab bolus material samples, 4 samples of 0.5 cm (S1–S4) and 3 samples of 1 cm thickness (S5–S7), were analysed and compared with tissue equivalent water phantom, which was selected for reference material. Gamma analysis method was used to evaluate the dose distribution of the boluses. In addition, 487,204 point-dose values of each bolus were compared with the point-doses of corresponding reference material by using Spearman’s correlation coefficient analysis. The passing rates varied from 58.3 to 100% for 0.5 cm thick samples, and on the other hand, the passing rates of all the 1 cm thick boluses were 100%. All the correlation coefficient values were above 0.975. The correlation was statistically significant for all the samples (p < 0.001). The correlation coefficient of S4 bolus sample was the highest among the 0.5 cm thick bolus samples with a result of 0.989. Likewise, S5 and S6 bolus samples were the highest among the 1 cm thick ones with a result of 0.995. The results indicated that the material planned to be used as bolus can be evaluated with EPID in daily use.

The influence of Nd2O3 on the radiation shielding, physical, mechanical, and acoustic properties of the (75 − x)TeO2–15MgO–10Na2O–xNd2O3 glasses as a potent radiation shielding material

“…The cost, noncorrosive, eco-friendly properties, high transparency, non-toxic nature, and good mechanical features are the advantages of using glasses as shielding materials. [11][12][13][14][15][16][17][18][19][20][21][22][23][24][25][26][27][28][29][30] Researches show that tellurite glass is extremely effective against gamma photon in comparison with the other types of glasses. [20][21][22][23] Sayyed [22] surveyed the effect of the Bi 2 O 3 on the shielding ability of the tellurite glass with the general formula of TeO 2 -B 2 O 3 -ZnO.…”