Abstract
Objectives
To investigate the effect of b value and size of region of interest (ROI) on apparent diffusion coefficient (ADC) measurement and its reproducibility in liver diffusion-weighted imaging (DWI).
Methods
Thirty-six volunteers underwent liver DWI twice with b values of 0, 100, 500, and 800 s/mm2. ADCs were measured with ROI of 50 mm2 on ADC maps generated with different b values of (0, 100), (0, 500), (0, 800), (0, 100, 500), (0, 100, 800), (0, 500, 800), and (0, 100, 500, 800) s/mm2. ADCs from b values of (0, 800) s/mm2 were measured with 4 ROI sizes (50, 100, 200 and 300 mm2). ANOVA analysis was used to compare differences of ADCs among different ROI sizes and different combined b values. Bland–Altman method was used to assess reproducibility of ADC measurement.
Results
ADCs with larger ROI size were slightly higher than those with smaller one, while no statistical difference was found (P > 0.05). And reproducibility of ADC measurement with different ROI sizes was comparable (LOA 7.0–8.2% for right lobe, 14.15–17.4% for left lobe). ADCs statistically decreased with increased maximum b values (P < 0.05). ADC measurement achieved the best reproducible with maximum b value of 800 s/mm2 regardless of the number of b values.
Conclusions
The b values influence ADC measurement and its reproducibility, while the ROI sizes do not affect them. Two b values of (0, 800) s/mm2 and ROI of 50 mm2 are recommended for liver ADC measurement.
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Change history
09 July 2021
A Correction to this paper has been published: https://doi.org/10.1007/s42058-021-00071-5
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Huang, Y., Xie, L., Cao, Z. et al. Effect of b values and size of region of interest on apparent diffusion coefficient measurement and its reproducibility in liver diffusion-weighted MRI. Chin J Acad Radiol 4, 56–62 (2021). https://doi.org/10.1007/s42058-021-00053-7
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DOI: https://doi.org/10.1007/s42058-021-00053-7