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DOI: 10.1148/radiol.2412051330
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Volumetric Cartilage Measurements of Porcine Knee at 1.5-T and 3.0-T MR Imaging: Evaluation of Precision and Accuracy1

Jan S. Bauer, MD, Stefanie J. Krause, MD, Christian J. Ross, MD, Roland Krug, PhD, Julio Carballido-Gamio, PhD, Eugene Ozhinsky, BA, Sharmila Majumdar, PhD and Thomas M. Link, MD

1 From Musculoskeletal and Quantitative Imaging Research, Department of Radiology, University of California, San Francisco, Calif. Received August 9, 2005; revision requested October 17; revision received November 4; accepted December 1; final version accepted February 6, 2006. Supported by National Institutes of Health grants AR46905 and AG17762. Address correspondence to J.S.B., Institut für Röntgendiagnostik, Technische Universität München, Ismaninger Strasse 22, 81675 München, Germany (e-mail: jsb{at}roe.med.tum.de).


Figure 1
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  		Figure 1: Graph shows calculated SI for the 3.0-T fat-saturated SPGR sequence with different repetition times (TR) and flip angles ({alpha}) at an echo time of 10.6 msec; higher SIs are plotted as lighter grays.

 

Figure 2
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  		Figure 2a: Graphs show calculated SNRE (left) and CNRE (right) values (plotted along y-axis in sec–1/2) for (a) different bandwidths, (b) different flip angles, and (c) different echo times (TE). Required echo times for partial and full Fourier space acquisition, respectively, were 3.5 and 11.5 msec (for the 1.5-T fat-saturated [fs] SPGR sequence), 3.2 and 10.6 msec (for the 3.0-T fat-saturated SPGR sequence), and 5.8 and 11.0 msec (for the 3.0-T water excitation [WE] sequence). FSE = fast spin echo.

 

Figure 2
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  		Figure 2b: Graphs show calculated SNRE (left) and CNRE (right) values (plotted along y-axis in sec–1/2) for (a) different bandwidths, (b) different flip angles, and (c) different echo times (TE). Required echo times for partial and full Fourier space acquisition, respectively, were 3.5 and 11.5 msec (for the 1.5-T fat-saturated [fs] SPGR sequence), 3.2 and 10.6 msec (for the 3.0-T fat-saturated SPGR sequence), and 5.8 and 11.0 msec (for the 3.0-T water excitation [WE] sequence). FSE = fast spin echo.

 

Figure 2
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  		Figure 2c: Graphs show calculated SNRE (left) and CNRE (right) values (plotted along y-axis in sec–1/2) for (a) different bandwidths, (b) different flip angles, and (c) different echo times (TE). Required echo times for partial and full Fourier space acquisition, respectively, were 3.5 and 11.5 msec (for the 1.5-T fat-saturated [fs] SPGR sequence), 3.2 and 10.6 msec (for the 3.0-T fat-saturated SPGR sequence), and 5.8 and 11.0 msec (for the 3.0-T water excitation [WE] sequence). FSE = fast spin echo.

 

Figure 3
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  		Figure 3: Representative sagittal images obtained with optimized MR imaging sequences. A, 1.5-T fat-saturated SPGR sequence, B, 3.0-T fat-saturated SPGR sequence, C, 3.0-T water excitation sequence, and, D, 3.0-T fast spin-echo sequence. Contrast between bone marrow and cartilage (solid arrowheads) was compromised by noise in the 1.5-T SPGR sequence and by blurring in the fast spin-echo sequence. Delineation of adjacent cartilage layers (open arrowheads) was better with the fat-saturated SPGR sequence than with the water excitation sequence at 3.0 T.

 

Figure 4
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  		Figure 4: Graphs show correlation of volumetric cartilage measurements at fat-saturated (fs) SPGR MR imaging at 1.5 T (left) and 3.0 T (right) with cartilage volumes determined by using the water displacement method. The specific correlation coefficients for different volumes are shown in Tables 2 and 4.

 




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