Items for "ultrasound"

Fiber Orientation Measurement on Short Fiber Reinforced PUR-RIM Components

Polyurethane components produced by a Reinforced Reaction Injection Moulding process (PUR-RRIM) show a distribution of fibre orientation that results from production and therefore affects the mechanical properties...

Keywords: nondestructive, microwaves, ultrasound, short fibre

Comparison of two- and three-dimensional ultrasonography in lung volume measurement of normal fetuses

Aim: The purpose of this study was to compare the two- and three-dimensional methods for measuring fetal lung volume of normal fetuses.

Methods: A cross-sectional study was performed with 51 normal pregnant women between 20 and 35 weeks...

Keywords: fetus, lung volume measurements, three-dimensional image, ultrasound

A simple anisotropy correction procedure for acoustic wood tomography

Anisotropy of acoustic propagation velocities is a ubiquitous feature of wood. This needs to be considered for successful application of travel time tomography, an increasingly popular technique for non-destructive testing of living trees...

Keywords: Acoustic, anisotropy, decay, inversion procedure, tomography, trees, ultrasound

The midsagittal view of the fetal brain: a useful landmark in recognizing the cause of fetal cerebral ventriculomegaly

Aim: To evaluate the positive predictive value of the midsagittal view of the fetal brain in recognizing the cause of ventriculomegaly diagnosed with traditional axial scan.

Methods: Fifty-eight pregnant women, referred to our Center following a generic diagnosis of ventriculomegaly have been evaluated: 38 had marked and 20 had borderline ventriculomegaly...

Keywords: Chiari II malformation, corpus callosum, Dandy-Walker complex, fetus, hydrocephalus, prenatal diagnosis, ultrasound, ventriculomegaly

Combined sonographic and endoscopic umbilical cord occlusion in twin and triplet gestations

Objective: To review our experience with a minimally invasive technique for umbilical cord occlusion as a method of selective feticide in monochorionic sets.

Study design: Umbilical cord occlusion was completed using 3 mm bipolar cautery under ultrasound guidance (3D/4D, n=6; 2D, n=6) with pre and post ligation endoscopic evaluation.

Results: 12 cases of monochorionic sets where selective feticide was performed were identified during the period 2000 to present...

Keywords: Endoscopic, feticide, triplets, twin-twin transfusion, ultrasound, umbilical cord occlusion

A sonographic short cervix as the only clinical manifestation of intra-amniotic infection

Objective: A sonographically short cervix is a powerful predictor of spontaneous preterm delivery...

Keywords: Cervical insufficiency, Cervical length, Chorioamnionitis, intra-amniotic infection, microbial invasion of the amniotic cavity, preterm delivery, short cervix, ultrasound

Gender- and parity-specific reference charts for fetal size in low risk singleton pregnancies at the onset of the third trimester

Objectives: To determine fetal growth in low risk pregnancies at the beginning of the third trimester and to assess the relative importance of fetal gender and maternal parity.

Setting: Dutch primary care midwifery practice.

Study design: Retrospective cohort study on 3641 singleton pregnancies seen at a primary care midwifery center in the Netherlands...

Keywords: Abdominal circumference, Fetal growth, gender differences, head circumference, normal ranges, parity, ultrasound

MRI and multiplanar 3D ultrasound compared in the prenatal assessment of enlarged posterior fossa

Our aim was to compare the diagnostic capabilities of the multiplanar mode of 3D ultrasound (3D US) and MRI in the assessment of a fetal enlarged cisterna magna...

Keywords: pregnancy, posterior fossa, ultrasound, VOCAL

Correlation between ultrasound and autopsy findings after 2^nd trimester terminations of pregnancy

Objective: To compare ultrasound (US) and fetal autopsy findings in 2^nd trimester termination of pregnancy because of structural fetal anomalies.

Methods: A total of 112 terminations of pregnancy (TOP) between 1999–2003 were reviewed retrospectively...

Keywords: Fetal malformations, ultrasound, autopsy

Ultrasonographic contrast-agent imaging of sub-millimeter vessel structures with spatial compounding: in vitro analyses / Kontrastmittelgestützte Ultraschallabbildung von Sub-Millimeter-Gefäßstrukturen mittels Spatial Compounding: In-vitro Analysen

In clinical diagnostics, ultrasonographic contrast-agent imaging gives access to medical parameters such as perfusion and vascularization...

Keywords: breast, mamma, microbubbles, subtraction angiography, tomography, ultrasound, Brust, Kontrastmittel, Mikrobläschen, Subtraktionsangiographie, Tomographie, Ultraschall