Abstract：Objective To investigate the features of normal prostates in 3.0T DW MR (Diffusion-Weighted Magnetic Resonance) images so as to provide a basis for selection of the optimal b-value. Methods Three b-values (b=600, 800, 1000 s/mm2) were applied respectively in 3.0T DW MR imaging of twenty normal prostates. Then, the signal intensity, standard deviation of the background signal intensity and apparent diffusion coefficient (ADC) values were measured in DWI of the central zone and peripheral zone of prostates. The signal-noise ratio (SNR) and contrast-noise ratio (CNR) were computed. And the quality of MR images were evaluated. Results When b-value was 600, 800 and 1000s/mm2, the SNR was (18.36±1.75), (14.63±2.32) and (11.83±1.65) and the CNR was (0.55±0.14), (0.47±0.11) and (0.39±0.90) respectively. There were statistically significant difference in SNR and CNR between different b-values (P<0.05). When b-value was 600 s/mm2, the ADC values acquired in MR imaging of the peripheral zone and central zone of prostates were (2.07±0.26)×10-3 mm2/s and (2.01±0.15)×10-3 mm2/s respectively without statistically significant differences (P＞0.05). When b-value was 800 and 1000 s/mm2, the ADC values of the peripheral zone and central zone of prostates were (1.80±0.22)×10-3mm2/s and (1.65±0.24)×10-3 mm2/s, (1.54±0.14)×10-3 mm2/s and (1.31±0.19)×10-3 mm2/s respectively with statistically significant differences (P＜0.05). The quality of MR images at three b-values (600, 800, 1000 s/mm2) were evaluated as (3.4±0.68), (3.05±0.69) and (2.75±0.91) respectively with statistically significant differences (P＜0.05). Conclusion The optimal b-value in 3.0T DW MRI of prostates was 800 s/mm2, which can display the diffusion of water molecules and meanwhile ensure the quality of images.
王猛，姚申思，邓刚，刘建新，金光暐. 正常成人前列腺3.0T磁共振3种b值扩散加权成像研究[J]. 中国医疗设备, 2015, 30(2): 59-62.
WANG Meng, YAO Shen-si, DENG Gang, LIU Jian-xin,. Study on Three b-Values in 3.0T DW MRI of Normal Prostates. China Medical Devices, 2015, 30(2): 59-62.
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