Abstract
In follow-up brain magnetic resonance imaging (MRI), precise reproducibility of the scan prescription is important so that over- or underestimating changes in volumes of clinical interest is prevented. (The scan prescription is defined as the location and orientation of the head with respect to the scan planes of the three-dimensional MRI matrix.) In this study, the misregistration between the original and a second scan was calculated in the case of both manual positioning and automatic positioning. These calculations were carried out both for a healthy volunteer scanned repeatedly and, in a retrospective study, for 225 patients who had an original and at least one follow-up scan. The effects of the scan operator being the same for both scans or being different were also examined. A commercially available 1.5 Tesla MRI system and a six-element head-array coil were employed in all of the imaging. The reproducibility of the scan prescription was determined by the registration of the original scan image to the follow-up scan image by use of the Fourier phase correlation method. Our results showed that (1) the reproducibility by automatic positioning was superior to that by manual positioning (p < 0.05), and (2) there was no significant difference in the results between when the operator was the same or different (p > 0.05). We conclude that, in follow-up brain MRI, automatic positioning should be used, because manual positioning decreases the reproducibility of the scan prescription even if the same operator performs the second scan.
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Acknowledgments
This research was partially supported by a Grant-in-Aid for Scientific Research (KAKENHI No. 21591571).
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The authors declare that they have no conflict of interest in this article.
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Kojima, S., Hirata, M., Shinohara, H. et al. Reproducibility of scan prescription in follow-up brain MRI: manual versus automatic determination. Radiol Phys Technol 6, 375–384 (2013). https://doi.org/10.1007/s12194-013-0211-8
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DOI: https://doi.org/10.1007/s12194-013-0211-8