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Quantification of Skeletal Involvement in Adults with Type I Gaucher's Disease: Fat Fraction Measured by Dixon Quantitative Chemical Shift Imaging as a Valid Parameter

Mario Maas1, Carla E. M. Hollak2, Erik M. Akkerman1, Johannes M. F. G. Aerts3, Jaap Stoker1 and Gerard J. Den Heeten1

1 Department of Radiology, Academic Medical Center, Meibergdreef 9, G1-231, 1105 AZ Amsterdam, The Netherlands.
2 Department of Hematology, Academic Medical Center, 1105 AZ Amsterdam, The Netherlands.
3 Department of Biochemistry, Academic Medical Center, 1105 AZ Amsterdam, The Netherlands.



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  		Fig. 1A. —35-year-old healthy male volunteer in whom placement of measurement slice and determination of region of interest is illustrated. Measurement slice is indicated on midsagittal localizer image. It is perpendicular to localizer image and passes through junction of anterior three quarters and posterior quarter of vertebral body L4. Slight angulation from true coronal plane is applied to make slice pass optimally through posterior parts of L3 and L5.

 


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  		Fig. 1B. —35-year-old healthy male volunteer in whom placement of measurement slice and determination of region of interest is illustrated. In coronal in-phase magnitude image, vertebrae are clearly distinguishable from their surroundings.

 


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  		Fig. 1C. —35-year-old healthy male volunteer in whom placement of measurement slice and determination of region of interest is illustrated. Interactively, with help of mouse, contours of vertebrae L3, L4, and L5 are drawn.

 


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  		Fig. 1D. —35-year-old healthy male volunteer in whom placement of measurement slice and determination of region of interest is illustrated. By applying four erosion operations to interior region of contours, we obtained regions of interest in coronal plane.

 


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  		Fig. 2. —Plot of fat fraction for healthy volunteers and patients with Gaucher's disease. Dixon QCSI = Dixon quantitative chemical shift imaging, dark gray = women, light gray = men.

 


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  		Fig. 3. —Plot of distribution of fat fraction in relation to clinical bone complications. A = healthy, B = Gaucher's disease without complications, C = Gaucher's disease with mild complications, D = Gaucher's disease with severe complications.

 

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