Abstract
Objective
To investigate whether a trained group of technicians using a modified breathing command during gadoxetate-enhanced liver MRI reduces respiratory motion artefacts compared to non-trained technicians using a traditional breathing command.
Materials and methods
The gadoxetate-enhanced liver MR images of 30 patients acquired using the traditional breathing command and the subsequent 30 patients after training the technicians to use a modified breathing command were analyzed. A subgroup of patients (n = 8) underwent scans both by trained and untrained technicians. Images obtained using the traditional and modified breathing command were compared for the presence of breathing artefacts [respiratory artefact-based image quality scores from 1 (best) to 5 (non-diagnostic)].
Results
There was a highly significant improvement in the arterial phase image quality scores in patients using the modified breathing command compared to the traditional one (P < 0.001). The percentage of patients with severe and extensive breathing artefacts in the arterial phase decreased from 33.3 % to 6.7 % after introducing the modified breathing command (P = 0.021). In the subgroup that underwent MRI using both breathing commands, arterial phase image quality improved significantly (P = 0.008) using the modified breathing command.
Conclusion
Training technicians to use a modified breathing command significantly improved arterial phase image quality of gadoxetate-enhanced liver MRI.
Key Points
• A modified breathing command reduced respiratory artefacts on arterial-phase gadoxetate-enhanced MRI (P < 0.001).
• The modified command decreased severe and extensive arterial-phase breathing artefacts (P = 0.021).
• Training technicians to use a modified breathing command improved arterial-phase images.
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Acknowledgments
The scientific guarantor of this publication is Andreas Gutzeit. The authors of this manuscript declare relationships with the following companies: Johannes M. Froehlich works as a consultant for a contrast media company. The other authors had full control of data and information that might have represented a conflict of interest for the author who is a consultant of a company. The authors state that this work has not received any funding. The professional biostatistician Nicole Graf (www.biostatistics.ch) kindly provided statistical advice for this manuscript. The institutional review board had generally approved retrospective studies. Written informed consent concerning anonymized data evaluation had been obtained from all subjects (patients) in this study. Neither this cohort nor a subset thereof has been published elsewhere. Methodology: retrospective, observational, performed at one institution. We would like to thank our innovative and wonderful technician team, who helped us examine all the patients: Sara Schwarz MT, Sarah Suter MT, Florentina Podrimaj MT, Christian Meier MT, Barbara Eichenberger MT and Katrin Pucher MT. We would also like to thank Rene Patzwahl MD, who gave us the idea for this project after intense discussion of the first paper by Davenport et al. [9].
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Gutzeit, A., Matoori, S., Froehlich, J.M. et al. Reduction in respiratory motion artefacts on gadoxetate-enhanced MRI after training technicians to apply a simple and more patient-adapted breathing command. Eur Radiol 26, 2714–2722 (2016). https://doi.org/10.1007/s00330-015-4086-4
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DOI: https://doi.org/10.1007/s00330-015-4086-4