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Polymer gel dosimetry using a three‐dimensional MRI acquisition technique
Author(s) -
Baras P.,
Seimenis I.,
Kipouros P.,
Papagiannis P.,
Angelopoulos A.,
Sakelliou L.,
Pappas E.,
Baltas D.,
Karaiskos P.,
Sandilos P.,
Vlachos L.
Publication year - 2002
Publication title -
medical physics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.473
H-Index - 180
eISSN - 2473-4209
pISSN - 0094-2405
DOI - 10.1118/1.1514657
Subject(s) - brachytherapy , dosimetry , materials science , monte carlo method , nuclear medicine , irradiation , calibration , biomedical engineering , optics , radiation therapy , physics , radiology , medicine , mathematics , nuclear physics , statistics , quantum mechanics
In this work, three‐dimensional (3‐D) MRI techniques are employed in N‐Vinylpyrrolidone‐Argon‐ (VIPAR‐) based polymer gel dosimetry. VIPAR gels were irradiated using a Nucletron microSelection192 Ir HDR brachytherapy remote afterloading system with single source dwell position and intravascular brachytherapy irradiation protocols. A single VIPAR gel and a single irradiation are adequate to obtain the full calibration curve needed. The 3‐D dose distributions obtained with the 3‐D MRI method were found to be in good agreement with the corresponding Monte Carlo calculations, for brachytherapy and intravascular irradiations. The method allows the reconstruction of isodose contours over any plane, with increased spatial resolution and accuracy following a single MR acquisition. VIPAR gel measurements using a 3‐D MRI readout technique can be of particular use in the experimental dosimetry of brachytherapy sources, as well as for dose verification purposes when complex irradiation regimes and three‐dimensional dose gradients are investigated.