Signe Winther Hasler, Uffe Bernchou, Anders Bertelsen, Elisabeth van Veldhuizen, Tine Schytte, Vibeke Nordmark Hansen, Carsten Brink, Faisal Mahmood
Physics and imaging in radiation oncology 2020 JulMagnetic resonance imaging (MRI) has exquisite soft-tissue contrast and is the foundation for image guided radiotherapy (IGRT) with integrated magnetic resonance linacs. However, MRI suffers from geometrical distortions. In this study the MRI system- and patient-induced geometric distortion at four different tumor-sites was investigated: adrenal gland (7 patients), liver (4 patients), pancreas (6 patients), prostate (20 patients). Maximum level of total distortion within the gross-tumor-volume (GTV) was 0.96 mm with no significant difference between abdominal patients (adrenal gland, liver, pancreas) and pelvic patients (prostate). Total tumor-site specific distortion depended on location in the field-of-view and increased with the distance to MRI iso-center. © 2020 The Authors.
Signe Winther Hasler, Uffe Bernchou, Anders Bertelsen, Elisabeth van Veldhuizen, Tine Schytte, Vibeke Nordmark Hansen, Carsten Brink, Faisal Mahmood. Tumor-site specific geometric distortions in high field integrated magnetic resonance linear accelerator radiotherapy. Physics and imaging in radiation oncology. 2020 Jul;15:100-104
PMID: 33458333
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