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Björk-Shiley Convexoconcave Valves: Susceptibility Artifacts at Brain MR Imaging and Mechanical Valve Fractures¹

¹ From the Julius Center for Health Sciences and Primary Care (M.J.v.G., Y.v.d.G.) and Department of Radiology (C.J.G.B., T.D.W., L.M.P.R., W.P.T.M.M.), University Medical Center Utrecht, Heidelberglaan 100, PO Box 85500, Room D01.335, 3508 GA Utrecht, the Netherlands; and Department of Cardiothoracic Surgery, Academic Medical Center, Amsterdam, the Netherlands (B.A.J.M.d.M.). From the 2000 RSNA scientific assembly. Received November 26, 2002; revision requested February 20, 2003; final revision received July 3; accepted July 28. Address correspondence to Y.v.d.G. (e-mail: Y.vanderGraaf@jc.azu.nl).

View larger version (175K): [in a new window]   Figure 1a.  (a) BSCC heart valve with large inlet strut and small outlet strut (arrows); the positions of the struts relative to the disk are shown. (b) Scanning electron microscopic image (magnification, x7.5) of an explanted BSCC valve with an SLF (arrow) of the outlet strut. (c) Scanning electron microscopic image (magnification, x60) of one leg of the outlet strut of an explanted BSCC valve with an SLF. (d) Scanning electron microscopic image (magnification, x60) of one end of a fractured outlet strut.

View larger version (195K): [in a new window]   Figure 1b.  (a) BSCC heart valve with large inlet strut and small outlet strut (arrows); the positions of the struts relative to the disk are shown. (b) Scanning electron microscopic image (magnification, x7.5) of an explanted BSCC valve with an SLF (arrow) of the outlet strut. (c) Scanning electron microscopic image (magnification, x60) of one leg of the outlet strut of an explanted BSCC valve with an SLF. (d) Scanning electron microscopic image (magnification, x60) of one end of a fractured outlet strut.

View larger version (197K): [in a new window]   Figure 1c.  (a) BSCC heart valve with large inlet strut and small outlet strut (arrows); the positions of the struts relative to the disk are shown. (b) Scanning electron microscopic image (magnification, x7.5) of an explanted BSCC valve with an SLF (arrow) of the outlet strut. (c) Scanning electron microscopic image (magnification, x60) of one leg of the outlet strut of an explanted BSCC valve with an SLF. (d) Scanning electron microscopic image (magnification, x60) of one end of a fractured outlet strut.

View larger version (196K): [in a new window]   Figure 1d.  (a) BSCC heart valve with large inlet strut and small outlet strut (arrows); the positions of the struts relative to the disk are shown. (b) Scanning electron microscopic image (magnification, x7.5) of an explanted BSCC valve with an SLF (arrow) of the outlet strut. (c) Scanning electron microscopic image (magnification, x60) of one leg of the outlet strut of an explanted BSCC valve with an SLF. (d) Scanning electron microscopic image (magnification, x60) of one end of a fractured outlet strut.

View larger version (124K): [in a new window]   Figure 2.  Transverse T2*-weighted gradient-echo MR image (710/27.6) of the brain obtained in 58-year-old man with a history of BSCC valve OSF shows two susceptibility artifacts (arrows).

View larger version (104K): [in a new window]   Figure 3a.  MR images of the brain obtained in 74-year-old man in whom intact BSCC valve was removed for prophylactic reasons. (a) Transverse T2*-weighted gradient-echo image (710/27.6) shows susceptibility artifact (arrow). (b) Corresponding coronal T2*-weighted gradient-echo image (710/27.6) shows the typical dipolar distortion generated by the same artifact (arrow).

View larger version (116K): [in a new window]   Figure 3b.  MR images of the brain obtained in 74-year-old man in whom intact BSCC valve was removed for prophylactic reasons. (a) Transverse T2*-weighted gradient-echo image (710/27.6) shows susceptibility artifact (arrow). (b) Corresponding coronal T2*-weighted gradient-echo image (710/27.6) shows the typical dipolar distortion generated by the same artifact (arrow).