Stereographic targeting in prostate radiotherapy: speed and precision by daily automatic positioning corrections using kilovoltage/megavoltage image pairs

International Journal of Radiation Oncology, Biology, Physics
Theodore F MutangaB J Heijmen

Abstract

A fully automated, fast, on-line prostate repositioning scheme using implanted markers, kilovoltage/megavoltage imaging, and remote couch movements has been developed and clinically applied. The initial clinical results of this stereographic targeting (SGT) method, as well as phantom evaluations, are presented. Using the SGT method, portal megavoltage images are acquired with the first two to six monitor units of a treatment beam, immediately followed by acquisition of an orthogonal kilovoltage image without gantry motion. The image pair is automatically analyzed to obtain the marker positions and three-dimensional prostate displacement and rotation. Remote control couch shifts are applied to correct for the displacement. The SGT performance was measured using both phantom images and images from 10 prostate cancer patients treated using SGT. With phantom measurements, the accuracy of SGT was 0.5, 0.2, and 0.3 mm (standard deviation [SD]) for the left-right, craniocaudal, and anteroposterior directions, respectively, for translations and 0.5 degrees (SD) for the rotations around all axes. Clinically, the success rate for automatic marker detection was 99.5%, and the accuracy was 0.3, 0.5 and 0.8 mm (SD) in the left-right, cranio...Continue Reading

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Citations

Oct 25, 2011·International Journal of Radiation Oncology, Biology, Physics·Theodore F MutangaBen J M Heijmen
Oct 5, 2010·International Journal of Radiation Oncology, Biology, Physics·Monique H P SmitsmansMarcel van Herk
Jun 29, 2010·Radiotherapy and Oncology : Journal of the European Society for Therapeutic Radiology and Oncology·Mathilda van ZijtveldBen Heijmen
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Apr 10, 2010·Radiotherapy and Oncology : Journal of the European Society for Therapeutic Radiology and Oncology·Guila DelouyaDaniel Taussky
Jun 16, 2009·Radiotherapy and Oncology : Journal of the European Society for Therapeutic Radiology and Oncology·Sarah O S OsmanPeter C Levendag
Mar 13, 2009·Radiotherapy and Oncology : Journal of the European Society for Therapeutic Radiology and Oncology·Iskandar KassimBen J M Heijmen
Nov 26, 2008·International Journal of Radiation Oncology, Biology, Physics·Gerard J van der WielenHans C J de Boer
Nov 18, 2008·Radiotherapy and Oncology : Journal of the European Society for Therapeutic Radiology and Oncology·Joan PenninkhofMaarten Dirkx
Oct 16, 2015·International Journal of Radiation Oncology, Biology, Physics·Thomas LangerakMischa Hoogeman
Jun 22, 2015·International Journal of Radiation Oncology, Biology, Physics·Stefan L S KwaBen J M Heijmen
Jan 27, 2015·International Journal of Radiation Oncology, Biology, Physics·Johan de BoerJan-Jakob Sonke
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Sep 15, 2012·Physics in Medicine and Biology·Johan de BoerJan-Jakob Sonke

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