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Keywords:
Liver, Ultrasound physics, Elastography, Diagnostic procedure, Cirrhosis
Authors:
L. Chami1, C. Pellot-Barakat1, M. Lefort1, A. Ayed2, I. Huynh-Charlier1, S. Egels1, O. Lucidarme1; 1Paris/FR, 2Paris /FR
DOI:
10.1594/ecr2014/C-2180
Results
Clinical indexes :
- Liver structure on B-mode US imaging was described as homogeneous (grade 0 and 1) in 41 patients (58,6%) and heterogeneous (grade 2 and 3) in 25 (41,4%).
- Patients Body Mass Index were : 31 normal weight (44,3%),
26 overweight (37,2%),
10 obesity (14,3%),
3 underweight (4,2%)
- Skin-to-liver thickness : mean 17,68 mm ; range 9-44 mm
Performances of linear and abdominal probes in elasticity measurements (average values on selected frames):
- At the time of examination,
the convex probe failed to provide elasticity measurements in 12 patients (17%) because no consistent frame could be selected by the operator for SWE measurements (insufficient colored pixels filling): 7 of 12 (58.3%) were patients with BMI > 25 (i.e overweight or obesity)
- The linear probe failed to provide elasticity measurements in only 2 cases (0.03 %).
- The degree of heterogeneity on US imaging was more correlated with the degree of liver stiffness when using the convex probe than when using the linear probe: r= 0.45 and r= 0.19 respectively (Fig 1)
- Linear and abdominal probes showed poor correlation in elasticity measurements: (r=0.22) (Fig 2)
Influence of pathological conditions of liver on SWE data quality (abdominal probe)
- Liver stiffness (ie average elasticity value of 3 selected frames) was correlated with the Spatial Variability data (SV) [r= 0.65] but not with TV [r= 0.02] and PNF [r=0.19] (Fig 3)
- Liver structure on B-mode US imaging (grade 0 to 3) was not correlated with any SWE data quality [r ≤ 0.2]
Influence of patient morphotype and body shape on SWE data quality (abdominal probe)
- Skin-to-liver thickness showed moderate correlation with Spatial variability (SV) (r= 0.43),
poor correlation with Percentage of Non Filling (PNF) (r=0.27) and no correlation with Temporal Variability (TV) (r= 0.03) (Fig 4)
- Body Mass Index showed moderate correlation with Spatial Variability data (r= 0.47) (Fig 5),
but not with PNF and TV data: r = 0.18 and r= 0.10 respectively.
Fig 6 summarizes our results.