Geometric inaccuracy and co-registration errors for CT,DynaCT and MRI images used in robotic stereotactic radiosurgery treatment planning |
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| Affiliation: | 1. Department of Physics, Carleton University, Ottawa, Ontario, Canada;2. Radiation Oncology Section, Department of Oncology, King Abdulaziz Medical City, National Guard Health Affairs, Riyadh, Saudi Arabia;3. Department of Medical Physics, The Ottawa Hospital Cancer Centre, Ottawa, Ontario, Canada;4. Department of Radiology, Faculty of Medicine, University of Ottawa, Ottawa, Ontario, Canada;5. Radiation Oncology, Memorial University of Newfoundland, St. John’s, Newfoundland, Canada;6. Department of Radiology, The Ottawa Hospital, Ottawa, Ontario, Canada;7. Department of Radiology, King Faisal Specialist Hospital & Research Centre, Riyadh, Saudi Arabia;1. Department of Microbiology, Faculty of Basic Sciences, Shahrekord Branch, Islamic Azad University, Shahrekord, Iran;2. Department of Microbiology, Damghan Branch, Islamic Azad University, Damghan, Iran;3. Young Researchers and Elite Club, Shahrekord Branch, Islamic Azad University, Shahrekord, Iran;1. Service d’imagerie médicale, CHU de la Cavale-Blanche, boulevard Tanguy-Prigent, 29609 Brest, France;2. Inserm UMR 1101, laboratoire de traitement de l’information médicale (LaTIM), 5, avenue Foch, 29200 Brest cedex, France;3. Service de neurochirurgie, CHU de la Cavale-Blanche, boulevard Tanguy-Prigent, 29609 Brest, France;4. Service de neuroradiologie interventionnelle, hôpital Bicêtre, AP–HP, 78, rue du Général-Leclerc, 94270 Le Kremlin-Bicêtre, France;5. SIEMENS S.A.S. Division Healthcare, service application, 40, avenue des Fruitiers, 93200 Saint-Denis, France;6. Groupe d’étude de la thrombose occidentale, CHU de la Cavale-Blanche, boulevard Tanguy-Prigent, 29609 Brest, France;1. Medical Physics Laboratory, Medical School, University of Athens, Greece;2. Gamma Knife Department, Hygeia Hospital, Athens, Greece;3. CT and MRI Department, Hygeia Hospital, Athens, Greece;4. Medical Physics Laboratory, Medical School, Democritus University of Thrace, Alexandroupolis, Greece;1. Division of Cardiology, Department of Internal Medicine, Kaohsiung Chang Gung Memorial Hospital, Chang Gung University College of Medicine, Kaohsiung, Taiwan;2. Institute of Clinical Medicine, College of Medicine, National Cheng Kung University, Tainan, Taiwan;3. Department of Radiology, Kaohsiung Chang Gung Memorial Hospital, Chang Gung University College of Medicine, Kaohsiung, Taiwan |
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| Abstract: | PurposeTo measure the combined errors due to geometric inaccuracy and image co-registration on secondary images (dynamic CT angiography (dCTA), 3D DynaCT angiography (DynaCTA), and magnetic resonance images (MRI)) that are routinely used to aid in target delineation and planning for stereotactic radiosurgery (SRS).MethodsThree phantoms (one commercial and two in-house built) and two different analysis approaches (commercial and MATLAB based) were used to quantify the magnitude of geometric image distortion and co-registration errors for different imaging modalities within CyberKnife’s MultiPlan treatment planning software. For each phantom, the combined errors were reported as a mean target registration error (TRE). The mean TRE’s for different intramodality imaging parameters (e.g., mAs, kVp, and phantom set-ups) and for dCTA, DynaCTA, and MRI systems were measured.ResultsOnly X-ray based imaging can be performed with the commercial phantom, and the mean TRE ± standard deviation values were large compared to the in-house analysis using MATLAB. With the 3D printed phantom, even drastic changes in treatment planning CT imaging protocols did not greatly influence the mean TRE (<0.5 mm for a 1 mm slice thickness CT). For all imaging modalities, the largest mean TRE was found on DynaCT, followed by T2-weighted MR images (albeit all <1 mm).ConclusionsThe user may overestimate the mean TRE if the commercial phantom and MultiPlan were used solely. The 3D printed phantom design is a sensitive and suitable quality assurance tool for measuring 3D geometric inaccuracy and co-registration errors across all imaging modalities. |
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| Keywords: | Image distortion MRI CBCT 3D printing phantoms |
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