726 poster SEED STRENGTH MEASUREMENTS PERFORMANCE OF AN UPGRADED SEED-LOADER SYSTEM FOR PERMANENT PROSTATE IMPLANTS

Bourque, Albert; Morrier, Janelle; Beaulieu, Lucie

doi:10.1016/s0167-8140(11)70848-9

Cited by 1 publication

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“…This is because if it is not done, the afterloader does not check the train composition regarding seeds/spacers. The method proposed in this study will be valid even if a more accurate array on this afterloader is implemented in the future [9], because it allows to evaluate the S K and compare it to the manufacturer value previously to a surgical procedure.…”

Section: Discussionmentioning

confidence: 99%

Physics Contributions I-125 seed calibration using the SeedSelectron® afterloader: a practical solution to fulfill AAPM-ESTRO recommendations

Pérez‐Calatayud

Richart

Guirado³

et al. 2012

jcb

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PurposeSeedSelectron® v1.26b (Nucletron BV, The Netherlands) is an afterloader system used in prostate interstitial permanent brachytherapy with I-125 selectSeed seeds. It contains a diode array to assay all implanted seeds. Only one or two seeds can be extracted during the surgical procedure and assayed using a well chamber to check the manufacturer air-kerma strength (SK) and to calibrate the diode array. Therefore, it is not feasible to assay 5–10% seeds as required by the AAPM-ESTRO. In this study, we present a practical solution of the SeedSelectron® users to fulfill the AAPM- ESTRO recommendations.Material and methodsThe method is based on: a) the SourceCheck® well ionization chamber (PTW, Germany) provided with a PTW insert; b) n = 10 selectSeed from the same batch and class as the seeds for the implant; c) the Nucletron insert to accommodate the n = 10 seeds on the SourceCheck® and to measure their averaged SK. Results for 56 implants have been studied comparing the SK value from the manufacturer with the one obtained with the n = 10 seeds using the Nucletron insert prior to the implant and with the SK of just one seed measured with the PTW insert during the implant.ResultsWe are faced with SK deviation for individual seeds up to 7.8%. However, in the majority of cases SK is in agreement with the manufacturer value. With the method proposed using the Nucletron insert, the large deviations of SK are reduced and for 56 implants studied no deviation outside the range of the class were found.ConclusionsThe new Nucletron insert and the proposed procedure allow to evaluate the SK of the n = 10 seeds prior to the implant, fulfilling the AAPM-ESTRO recommendations. It has been adopted by Nucletron to be extended to seedSelectron® users under request.

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Section: Discussionmentioning

confidence: 99%