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Fig. 2B —Comparison of calculated signal-to-noise ratio (SNR) and contrast-to-noise ratio (CNR) between patellar cartilage and articular fluid values with IDEAL–SPGR (dark gray) and fat-saturated SPGR (light gray) techniques. Error bars represent standard error above and below mean. Other than SNR of synovial fluid, all results are statistically significant (p < 0.05). Graph shows IDEAL–SPGR markedly improving CNR between patellar cartilage and articular fluid compared with fat-saturated SPGR for both patellar and femoral cartilage.