Title Influence of magnetic field strength on $T2^{*}$ decay and phase effects in gradient echo MRI of vertebral bone marrowInfluence of magnetic field strength on $T2^{*}$ decay and phase effects in gradient echo MRI of vertebral bone marrow Author Parizel, P.M. Riet, van, B. Hasselt, van, B.A.A.M. Van Goethem, J.W.M. Van den Hauwe, L. Dijkstra, H.A.J. Wiechen, van, P.J. de Schepper, A.M. Faculty/Department Faculty of Medicine and Health Sciences Research group Antwerp Surgical Training, Anatomy and Research Centre (ASTARC) Department of Biomedical Sciences Faculteit Geneeskunde UZA Publication type article Publication 1995New York, N.Y., 1995 Subject Computer. Automation Source (journal) Journal of computer assisted tomography. - New York, N.Y., 1977, currens Volume/pages 19(1995):3, p. 465-471 ISSN 0363-8715 1532-3145 ISI A1995QY97700023 Carrier E Target language English (eng) Full text (Publishers DOI) Affiliation University of Antwerp Abstract Objective: The goal of this study was twofold: first, to quantify the influence of magnetic field strength (B-0) on T2* and T2(susceptibility) relaxation rates in vertebral bone marrow; and second, to determine the significance of in-phase/out-of-phase phenomena in GE MRI as a function of TEs at different B-0 values. Materials and Methods: Magnetic resonance imaging of the spine was performed at 1.5, 1.0, and 0.2 T using a GE sequence (2D-FLASH) with variable TE. Vertebral body signal intensities were measured and plotted against TE values. These curves were used to calculate T2* decay of bone marrow at different B-0 values. Results: At all field strengths, we observed exponential signal decay, modulated by a cosine function, the periodicity of which was proportional to B-0. The T2* values of vertebral bodies were 9.7 +/- 1.8 ms at 1.5 T, 17.2 +/- 2.4 ms at 1.0 T, and 53 +/- 5 ms at 0.2 T. True T2 relaxation time (independent of field strength) was 62 +/- 4 ms. The T2(susceptibility) was 11.7 ms at 1.5 T, 24.8 ms at 1.0 T, and 585 ms at 0.2 T. Conclusion: We conclude that at low B-0, susceptibility effects become less important and T2* approaches true T2 relaxation. E-info http://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcApp=PARTNER_APP&SrcAuth=LinksAMR&KeyUT=WOS:A1995QY97700023&DestLinkType=RelatedRecords&DestApp=ALL_WOS&UsrCustomerID=ef845e08c439e550330acc77c7d2d848 http://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcApp=PARTNER_APP&SrcAuth=LinksAMR&KeyUT=WOS:A1995QY97700023&DestLinkType=FullRecord&DestApp=ALL_WOS&UsrCustomerID=ef845e08c439e550330acc77c7d2d848 http://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcApp=PARTNER_APP&SrcAuth=LinksAMR&KeyUT=WOS:A1995QY97700023&DestLinkType=CitingArticles&DestApp=ALL_WOS&UsrCustomerID=ef845e08c439e550330acc77c7d2d848 Handle