Comparison Between CT and MR Images as More Favorable Reference Data Sets for Fusion Imaging-Guided Radiofrequency Ablation or Biopsy of Hepatic Lesions: A Prospective Study with Focus on Patient’s Respiration
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To identify the more accurate reference data sets for fusion imaging-guided radiofrequency ablation or biopsy of hepatic lesions between computed tomography (CT) and magnetic resonance (MR) images.
Materials and Methods
This study was approved by the institutional review board, and written informed consent was received from all patients. Twelve consecutive patients who were referred to assess the feasibility of radiofrequency ablation or biopsy were enrolled. Automatic registration using CT and MR images was performed in each patient. Registration errors during optimal and opposite respiratory phases, time required for image fusion and number of point locks used were compared using the Wilcoxon signed-rank test.
The registration errors during optimal respiratory phase were not significantly different between image fusion using CT and MR images as reference data sets (p = 0.969). During opposite respiratory phase, the registration error was smaller with MR images than CT (p = 0.028). The time and the number of points locks needed for complete image fusion were not significantly different between CT and MR images (p = 0.328 and p = 0.317, respectively).
MR images would be more suitable as the reference data set for fusion imaging-guided procedures of focal hepatic lesions than CT images.
KeywordsFusion imaging Ultrasonography Computed tomography Magnetic resonance imaging Automatic registration
This study was supported by a Samsung Medison Grant [#PHO0132251].
Compliance with Ethical Standards
Conflict of interest
The funder only provided support in the form of salaries for authors who are employees of Samsung Medison. Authors who are employees of Samsung Electronics Co. [Y.O., J.J., J.C., J.R., K.J.L., J.K. and W.C.B.] or Samsung Medison [D.K.S., S.J.C. and D.K.] participated in the development of the S-Fusion, provided technical advices and analysis tools during the clinical trial and contributed in writing the manuscript, especially technical parts. Only the authors from Samsung Medical Center, Department of Radiology, had full control of the study design, data collection, decision to publish or preparation of the manuscript. One author (M.W.L.) is also a consultant for Samsung Medison.
All procedures performed in studies involving human participants were in accordance with the ethical standards of the institutional and/or national research committee and with the 1964 Declaration of Helsinki and its later amendments or comparable ethical standards.
Written informed consent was obtained from all patients for this prospective study.
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