E. Schneider, M. NessAiver Osteoarthritis and Cartilage

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Presentation transcript:

The Osteoarthritis Initiative (OAI) magnetic resonance imaging quality assurance update E. Schneider, M. NessAiver Osteoarthritis and Cartilage Volume 21, Issue 1, Pages 110-116 (January 2013) DOI: 10.1016/j.joca.2012.10.011 Copyright © 2012 Osteoarthritis Research Society International Terms and Conditions

Fig. 1 Example longitudinal measurements of the ACR phantom (A) length (site 1) and (B) diameter (site 4) from slice 5 (25mm off-isocenter). In both (A) and (B), the solid green line represents the nominal value (148.0mm length; 190.0mm diameter). In (B), the four measurement directions are individually identified: A/P (dark blue diamond), left/right (L/R; pink square), left upper to right lower diagonal (diag up; yellow triangle), and left lower to right upper diagonal (diag down; blue circle). No ACR phantom changes occurred during the measurement period, however the MR system upgrade (black arrow) occurred in April 2010 for site 1 and in September 2005 for site 4. This change is more apparent in the length measurement (A). Actual ACR phantom length is 148.0mm and diameter 190.0mm. Osteoarthritis and Cartilage 2013 21, 110-116DOI: (10.1016/j.joca.2012.10.011) Copyright © 2012 Osteoarthritis Research Society International Terms and Conditions

Fig. 2 Example longitudinal measurements of the OAI phantom (A) 3D spherical volume (site 3) and (B) T2 value (site 1). In (A), the volume for the right (+60mm off-isocenter; blue square) and left knee (−60mm off-isocenter; pink square) coil positions are tracked separately to understand the impact of gradient non-linearity. In (B), in addition to tracking the right and left knee coil positions separately, the outer phantom is mathematically divided into are quadrants to understand the impact of RF non-uniformity as well as the interaction between the RF and gradient fields. Thus four separate measurements are available for each the right and left knee coils positions. The top two quadrants are shown for the left knee coil position (upper left quadrant pink square; upper right quadrant pink triangle) and the right knee coil position (upper left quadrant blue square; upper right quadrant blue triangle). Both site 3 (November 2007) and site 1 (September 2005) replaced OAI phantoms (green arrow) during the measurement period. The MR system upgrade (black arrow) for both sites occurred in May 2010. The 5% volume change in (A) was caused by the different phantom. Approximate (original) phantom spherical volume is 210mm3 (new phantom: 222mm3) and the outer compartment target T2 value is 50ms. Osteoarthritis and Cartilage 2013 21, 110-116DOI: (10.1016/j.joca.2012.10.011) Copyright © 2012 Osteoarthritis Research Society International Terms and Conditions