Abstract
Objective
The objective of this study was to evaluate a simplified intravoxel incoherent motion (IVIM) approach of diffusion-weighted imaging (DWI) with four b-values for liver lesion characterisation at 1.5 T.
Methods
DWI data from a respiratory-gated MRI sequence with b = 0, 50, 250, 800 s/mm2 were retrospectively analysed in 173 lesions and 40 healthy livers. The apparent diffusion coefficient ADC = ADC(0,800) and IVIM-based parameters D1′ = ADC(50,800), D2′ =ADC(250,800), f1′, f2′, D*′, ADClow = ADC(0,50), and ADCdiff=ADClow-D2′ were calculated voxel-wise without fitting procedures. Differences between lesion groups were investigated.
Results
Focal nodular hyperplasias were best discriminated from all other lesions by f1′ with an area under the curve (AUC) of 0.989. Haemangiomas were best discriminated by D1′ (AUC of 0.994). For discrimination between malignant and benign lesions, ADC(0,800) and D1′ were best suited (AUC of 0.915 and 0.858, respectively). Discriminatory power was further increased by using a combination of D1′ and f1′.
Conclusion
IVIM parameters D and f approximated from three b-values provided more discriminatory power between liver lesions than ADC determined from two b-values. The use of b = 0, 50, 800 s/mm2 was superior to that of b = 0, 250, 800 s/mm2. The acquisition of four instead of three b-values has no further benefit for lesion characterisation.
Key Points
• Diffusion and perfusion characteristics are assessable with only three b-values.
• Association of b = 0, 50, 800 s/mm2is superior to b = 0, 250, 800 s/mm2.
• A fourth acquired b-value has no benefit for differential diagnosis.
• For liver lesion characterisation, simplified IVIM analysis is superior to ADC determination.
• Simplified IVIM approach guarantees numerically stable, voxel-wise results and short acquisition times.
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Abbreviations
- ADC:
-
Apparent diffusion coefficient
- AUC:
-
Area under the curve
- CCC:
-
Cholangiocellular carcinoma
- DWI:
-
Diffusion-weighted imaging
- FNH:
-
Focal nodular hyperplasia
- HCC:
-
Hepatocellular carcinoma
- IVIM:
-
Intravoxel incoherent motion
- REF:
-
Reference tissue
- ROI:
-
Region of interest
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The scientific guarantor of this publication is Petra Mürtz.
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Mürtz, P., Sprinkart, A.M., Reick, M. et al. Accurate IVIM model-based liver lesion characterisation can be achieved with only three b-value DWI. Eur Radiol 28, 4418–4428 (2018). https://doi.org/10.1007/s00330-018-5401-7
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DOI: https://doi.org/10.1007/s00330-018-5401-7