Mazaheri Y, Vargas HA, Akin O, Goldman DA, Hricak H. Reducing the influence of b‐value selection on diffusion‐weighted imaging of the prostate: evaluation of a revised monoexponential model within a clinical setting. J Magn Reson Imaging 2012;35:660–668

Abstract

Some of the values reported in the legend of Figure 1 were incorrect as published. The authors regret the error and thank Dr. Daniel G.Q. Chong, PhD, and Dr. Lauren J. Bains, PhD, both from the Department of Diagnostic, Interventional and Pediatric Radiology, Inselspital, Bern Switzerland, for identifying the errors. The legend for Figure 1 appeared as follows: Figure 1. Simulated normalized logarithmic diffusion signal intensity (log(S(b))/S(0)) as a function of b-value based on values reported by Riches et al (13). The estimated values of ADC400 and ADC700 were obtained from the standard monoexponential model and the estimated values of D and f were obtained from the revised monoexponential model. A: For benign PZ, the simulated biexponential signal was generated using the following reported parameters (13): D = 1.45 × 10−3 mm2/s, f = 0.20, and D* = 21.20 × 10−3 mm2/s. Estimated ADC values were: ADC400 = 2.00 × 10−3 mm2/s, ADC700 = 1.80 × 10−3 mm2/s. Estimated values for the revised monoexponential were: D = 1.45 × 10−3 mm2/s, f = 0.20. B: For tumor the simulated biexponential signal was generated using the following reported parameters (13): D = 1.10 × 10−3 mm2/s, f = 0.15, and D* = 25.20 × 10−3 mm2/s. Estimated ADC values were: ADC400 = 1.50 × 10−3 mm2/s, ADC700 = 1.30 × 10−3 mm2/s. Estimated values for the revised monoexponential were: D = 1.10 × 10−3 mm2/s, f = 0.15. It should have appeared as follows: Figure 1. Simulated normalized logarithmic diffusion signal intensity (log(S(b))/S(0)) as a function of b-value based on values reported by Riches et al (13). The estimated values of ADC400 and ADC700 were obtained from the standard monoexponential model and the estimated values of D and f were obtained from the revised monoexponential model. A: For benign PZ, the simulated biexponential signal was generated using the following reported parameters (13): D = 1.45 × 10−3 mm2/s, f = 0.20, and D* = 21.20 × 10−3 mm2/s. Estimated ADC values were: ADC400 = 2.01 × 10−3 mm2/s, ADC700 = 1.77 × 10−3 mm2/s. Estimated values for the revised monoexponential were: D = 1.45 × 10−3 mm2/s, f = 0.22. B: For tumor the simulated biexponential signal was generated using the following reported parameters (13): D = 1.10 × 10−3 mm2/s, f = 0.15, and D* = 25.20 × 10−3 mm2/s. Estimated ADC values were: ADC400 = 1.51 × 10−3 mm2/s, ADC700 = 1.33 × 10−3 mm2/s. Estimated values for the revised monoexponential were: D = 1.10 × 10−3 mm2/s, f = 0.16.