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Thomas J Vogl - One of the best experts on this subject based on the ideXlab platform.

Luis Nombelafranco - One of the best experts on this subject based on the ideXlab platform.

Simon S Martin - One of the best experts on this subject based on the ideXlab platform.

Harriet C Thoeny - One of the best experts on this subject based on the ideXlab platform.

  • diffusion weighted imaging of the parotid gland influence of the choice of b values on the apparent diffusion coefficient value
    Journal of Magnetic Resonance Imaging, 2004
    Co-Authors: Harriet C Thoeny, Frederik De Keyzer, Chris Boesch, Robert Hermans
    Abstract:

    PURPOSE: To determine how the ADC value of parotid glands is influenced by the choice of b-values. MATERIALS AND METHODS: In eight healthy volunteers, diffusion-weighted echo-planar imaging (DW-EPI) was performed on a 1.5 T system, with b-values (in seconds/mm2) of 0, 50, 100, 150, 200, 250, 300, 500, 750, and 1000. ADC values were calculated by two alternative methods (exponential vs. logarithmic fit) from five different sets of b-values: (A) all b-values; (B) b=0, 50, and 100; (C) b=0 and 750; (D) b=0, 500, and 1000; and (E) b=500, 750, and 1000. RESULTS: The mean ADC values for the different settings were (in 10(-3) mm2/second, exponential fit): (A) 0.732+/-0.019, (B) 2.074+/-0.084, (C) 0.947+/-0.020, (D) 0.890+/-0.023, and (E) 0.581+/-0.021. ADC values were significantly (P <0.001) different for all pairwise comparisons of settings (A-E) of b-values, except for A vs. D (P=0.172) and C vs. D (P=0.380). The ADC(B) was significantly higher than ADC(C) or ADC(D), which was significantly higher than ADC(E). ADC values from exponential vs. logarithmic fit (P=0.542), as well as left vs. right parotid gland (P=0.962), were indistinguishable. CONCLUSION: The ADC values calculated from low b-value settings were significantly higher than those calculated from high b-value settings. These results suggest that not only true diffusion but also perfusion and saliva flow may contribute to the ADC.

  • diffusion weighted imaging of the parotid gland influence of the choice of b values on the apparent diffusion coefficient value
    Journal of Magnetic Resonance Imaging, 2004
    Co-Authors: Harriet C Thoeny, Frederik De Keyzer, Chris Boesch, Robert Hermans
    Abstract:

    Purpose To determine how the ADC value of parotid glands is influenced by the choice of b-values. Materials and Methods In eight healthy volunteers, diffusion-weighted echo-planar imaging (DW-EPI) was performed on a 1.5 T system, with b-values (in seconds/mm2) of 0, 50, 100, 150, 200, 250, 300, 500, 750, and 1000. ADC values were calculated by two alternative methods (exponential vs. logarithmic fit) from five different sets of b-values: (A) all b-values; (B) b = 0, 50, and 100; (C) b = 0 and 750; (D) b = 0, 500, and 1000; and (E) b = 500, 750, and 1000. Results The mean ADC values for the different settings were (in 10−3 mm2/second, exponential fit): (A) 0.732 ± 0.019, (B) 2.074 ± 0.084, (C) 0.947 ± 0.020, (D) 0.890 ± 0.023, and (E) 0.581 ± 0.021. ADC values were significantly (P < 0.001) different for all pairwise comparisons of settings (A–E) of b-values, except for A vs. D (P = 0.172) and C vs. D (P = 0.380). The ADC(B) was significantly higher than ADC(C) or ADC(D), which was significantly higher than ADC(E). ADC values from exponential vs. logarithmic fit (P = 0.542), as well as left vs. right parotid gland (P = 0.962), were indistinguishable. Conclusion The ADC values calculated from low b-value settings were significantly higher than those calculated from high b-value settings. These results suggest that not only true diffusion but also perfusion and saliva flow may contribute to the ADC. J. Magn. Reson. Imaging 2004;20:786–790. © 2004 Wiley-Liss, Inc.

Louis Laflamme - One of the best experts on this subject based on the ideXlab platform.