Table 1.
Axial 2D diffusion-weighted spin echo - echo planar imaging (DWI-SE-EPI) sequence: acquisition parameters for scanner-A, scanner-B and scanner-C.
Figure 1.
Schematic description of a) breast coil, phantom and acquisition slab (21 slices), as well as b) ROIref positioning.
Figure 2.
Phantom ADC along each of the main orthogonal directions (ADCi - i = 1, readout/left-right; i = 2, phase-encoding/anterior-posterior; i = 3, slice-selection/head-foot) for scanner-A, scanner-B and scanner-C.
The bar charts depict the mean of the average value within ROIref ± standard deviation across five repetitions. The dashed line represents the known phantom diffusion coefficient (2.14±0.03×10−3 mm2/s) at the reference temperature value of 22°C.
Figure 3.
Coefficient of variation for repeated measurements of phantom ADC along each of the main orthogonal directions ( - i = 1, readout/left-right; i = 2, phase-encoding/anterior-posterior; i = 3, slice-selection/head-foot) for scanner-A, scanner-B and scanner-C.
The bar charts depict the mean value ± standard deviation within ROIref.
Figure 4.
Non-uniformity of maps of phantom ADC along each of the main orthogonal directions ( - i = 1, readout/left-right; i = 2, phase-encoding/anterior-posterior; i = 3, slice-selection/head-foot) for scanner-A, scanner-B and scanner-C.
The bar charts depict the mean value ± standard deviation across five repetitions.
Figure 5.
Mean ADC along the main orthogonal directions (<ADC>) as well as mean diffusivity (MD) of the phantom for scanner-A, scanner-B and scanner-C.
The bar charts depict the mean of the average value within ROIref ± standard deviation across five repetitions. The dashed line represents the known phantom diffusion coefficient (2.14±0.03×10−3 mm2/s) at the reference temperature value of 22°C.
Table 2.
CV<ADC> and CVMD results [mean value (standard deviation within ROIref)] as well as NU<ADC> and NUMD results [mean value (standard deviation across five repetitions)] for scanner-A, scanner-B and scanner-C.