Clinical application of MOSkin dosimeters to rectal wall in vivo dosimetry in gynecological HDR brachytherapy

M. Carrara, A. Romanyukha, C. Tenconi, D. Mazzeo, A. Cerrotta, M. Borroni, D. Cutajar, M. Petasecca, M. Lerch, J. Bucci, A. Richetti, S. Presilla, C. Fallai, G. Gambarini, E. Pignoli, A. Rosenfeld

Research output: Contribution to journalArticle

Abstract

Purpose Three MOSkins dosimeters were assembled over a rectal probe and used to perform in vivo dosimetry during HDR brachytherapy treatments of vaginal cancer. The purpose of this study was to verify the applicability of the developed tool to evaluate discrepancies between planned and measured doses to the rectal wall. Materials and methods MOSkin dosimeters from the Centre for Medical Radiation Physics are particularly suitable for brachytherapy procedures for their ability to be easily incorporated into treatment instrumentation. In this study, 26 treatment sessions of HDR vaginal brachytherapy were monitored using three MOSkin mounted on a rectal probe. A total of 78 measurements were collected and compared to doses determined by the treatment planning system. Results Mean dose discrepancy was determined as 2.2 ± 6.9%, with 44.6% of the measurements within ±5%, 89.2% within ±10% and 10.8% higher than ±10%. When dose discrepancies were grouped according to the time elapsed between imaging and treatment (i.e., group 1: ≤90 min; group 2: >90 min), mean discrepancies resulted in 4.7 ± 3.6% and 7.1 ± 5.0% for groups 1 and 2, respectively. Furthermore, the position of the dosimeter on the rectal catheter was found to affect uncertainty, where highest uncertainties were observed for the dosimeter furthest inside the rectum. Conclusions This study has verified MOSkin applicability to in-patient dose monitoring in gynecological brachytherapy procedures, demonstrating the dosimetric rectal probe setup as an accurate and convenient IVD instrument for rectal wall dose verification. Furthermore, the study demonstrates that the delivered dose discrepancy may be affected by the duration of treatment planning.

Original languageEnglish
Pages (from-to)5-12
Number of pages8
JournalPhysica Medica
Volume41
DOIs
Publication statusPublished - Sep 1 2017

Keywords

  • HDR brachytherapy
  • In vivo dosimetry
  • Solid state dosimetry
  • Vaginal cancer

ASJC Scopus subject areas

  • Biophysics
  • Radiology Nuclear Medicine and imaging
  • Physics and Astronomy(all)

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    Carrara, M., Romanyukha, A., Tenconi, C., Mazzeo, D., Cerrotta, A., Borroni, M., Cutajar, D., Petasecca, M., Lerch, M., Bucci, J., Richetti, A., Presilla, S., Fallai, C., Gambarini, G., Pignoli, E., & Rosenfeld, A. (2017). Clinical application of MOSkin dosimeters to rectal wall in vivo dosimetry in gynecological HDR brachytherapy. Physica Medica, 41, 5-12. https://doi.org/10.1016/j.ejmp.2017.05.003