Accuracy of Intracavitary Applicator Reconstruction for Cervix Cancer Brachytherapy ALMasri, Hussein Kakinohana, Yasumasa Toita, Takafumi Ariga, Takuro Kasuya, Goro Murayama, Sadayuki 2019-12-18T11:33:22Z 2019-12-18T11:33:22Z 2019-12-03
dc.description.abstract The accuracy of intracavitary applicator reconstruction for cervical cancer was assessed. A homemade phantom that mimics clinical applicator placement and reference points was used. Three stainless steel (15°, 30°, and 45°) tandems, x-ray markers, and three reference points were used to compare radiography- and CT-based systems. For CT reconstructions, two Fletcher CT compatible (15° and 30°) tandems, two ovoids, and two reference points, with and without inserted x-ray markers, were used. A 2.5-mm CT slice thickness was used. To check for inter- and intra-operator variations in CT, only a 30° tandem without x-ray markers and 1.25-mm CT slice thickness were used. Applicators were reconstructed three times for each image set to verify the operator reproducibility. A 6 Gy dose was prescribed and normalized at AL-point. Source dwell times were compared to check for dose variation at A-point. Maximum standard deviations SD (σ) for radiography and CT reconstructions were 0.35 and 0.83mm, respectively. Analysis of variance for the means of 15° and 30° tandems showed no significant difference. Levene’s test proved insignificant difference for 15° tandem (p value = 0.131), whereas it showed a significant difference for 30° tandem (p value = 0.011). This phantom study showed that the variance of dwell times between the two methods for 30° tandem was statistically significant due to increased applicator curvature. CT proves superiority to radiography. X-ray marker method was more accurate but has less image quality. Inter- and intra-oncologist variations showed good agreement. en_US
dc.identifier.issn 2523-8973
dc.language.iso en en_US
dc.publisher Springer en_US
dc.subject Brachytherapy en_US
dc.subject Intracavitary en_US
dc.subject Radiography en_US
dc.subject Computed tomography en_US
dc.subject Catheter reconstruction en_US
dc.title Accuracy of Intracavitary Applicator Reconstruction for Cervix Cancer Brachytherapy en_US
dc.type Article en_US
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