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Keywords:
Tissue characterisation, Technical aspects, Ultrasound, Thyroid / Parathyroids, Head and neck
Authors:
K. S. S. K. Bhatia1, A. C. L. Lam2, A. D. King3, A. Ahuja3; 1Hong Kong/HK, 2Shatin/HK, 3Hong Kong/CN
DOI:
10.1594/ecr2014/C-1903
Results
The mean SWE kPa values of each thyroid tissue type at different levels of compression are shown in Table 1 (Fig.
3).
All tissue types had higher SWE stiffness at high compared to lower compression levels (P values <0.05).
SWE values were higher for papillary carcinoma than benign hyperplastic nodules,
and both tissues types were higher than normal parenchyma (P values <0.05).
Of importance,
these differences were statistically significant at all compression levels except for hyperplastic nodule vs.
papillary carcinoma at minimal compression level (Table 2 (Fig.
4)).
Graphs showing the relative SWE (kPa) increment (%) versus % axial strain for different types of thyroid tissue are shown in Fig 5.
Boxplots of absolute SWE (kPa) increment for different tissue types at different compression levels compared to minimal compression level are shown in Fig 6.
There was an increase in SWE stiffness (kPa) for each tissue type for successive increases in axial compression.
Importantly,
the rate of increase in SWE stiffness was different for each tissue type,
evidenced by differences in the slopes of the SWE (kPa) versus strain graphs (Fig 5 d).
In this respect,
the SWE stiffness increment was higher for papillary carcinoma than MNG,
i.e.
steeper slope of the papillary Ca best-fit line,
and both types of nodule were higher than normal parenchyma.