Assessment of levator hiatus by 3D ultrasound volume contrast imaging in normal nulliparas

Abstract

The ability of 3D ultrasound volume contrast imaging in C-plane (VCI-C) in the assessment of female levator hiatus was analyzed in eighty normal nulliparas. Interoperator variability in levator hiatus measurements was analyzed. The comparison of the axial image of magnetic resonance imaging (MRI) and C-plane image of volume contrast imaging (VCI) in thirty normal nulliparas was also done. It shows that VCI-C can clearly demonstrate the structure and accurately quantitates the size of the levator hiatus. It is reliable, convenient and without contraindication in assessment of female levator hiatus. The technology opens up entirely new modality for assessing female pelvic floor.

Study on Different Connection Types of Air Spring

“…1 shows that the bellow is connected to the auxiliary reservoir through a single orifice, and the secondary suspension damping is entirely ensured by this orifice. When the air runs through the orifice, the air contact area is very small and the airflow moves fast, so it is regarded as one-dimensional isentropic flow through the orifice [10][11] . According to the Bernoulli equation, state equation of ideal gas, adiabatic equation and the contraction flow principle we can compute the orifice mass flow rate as follows:…”

Study on Influence of the Load Path on Formability of Variable Cross-Section Y-Shaped Tube Hydroforming

“…However, the practical application shows that both these two evaluation indexes can't express the comprehensive formability of Y-shaped hydroforming respectively, and for the difference of the methods, the results are different and sometimes even opposite completely. In order to avoid the one-sidedness problems which may be produced by single index, an evaluation index which is expressed by the product of effective forming height and average wall thickness on some section is presented in papers [5,6,7]. However, it can't reflect the variation of wall thickness of the whole tube, what's more, it's short of statistics of quantity.…”

Three-dimensional Ultrasound Appearance of Pelvic Floor in Nulliparous Women and Pelvic Organ Prolapse Women

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