Observation of the Impact of angle of cylinder wedge on wedge waves by laser ultrasound technique

2016 ◽  
Author(s):  
Jing Jia ◽  
Zhonghua Shen ◽  
Qingbang Han
Keyword(s):  
Laser Ultrasound ◽  
Ultrasound Technique ◽  
The Impact ◽  
Wedge Waves

Study of the impact of truncations on wedge waves by using the laser ultrasound technique

2015 ◽  
Vol 54 (24) ◽  
pp. 7406 ◽  
Author(s):  
Jing Jia ◽  
Zhonghua Shen ◽  
KaiHua Sun
Keyword(s):  
Laser Ultrasound ◽  
Ultrasound Technique ◽  
The Impact ◽  
Wedge Waves

Perinatal Profile of Twin Pregnancies: A Retrospective Review of 11 Years (1969–1979) at Hôpital Notre-Dame, Montréal, Canada

1982 ◽  
Vol 31 (3-4) ◽  
pp. 157-163 ◽  
Author(s):  
Marie-Françoise Desgranges ◽  
Xavier De Muylder ◽  
Jean-Marie Moutquin ◽  
Francisco Lazaro-Lopez ◽  
Bernard Leduc
Keyword(s):  
Perinatal Mortality ◽  
Perinatal Care ◽  
Fetal Mortality ◽  
Ultrasound Technique ◽  
Intrauterine Growth ◽  
Before And After ◽  
The Impact ◽  
Second Period ◽  
Twin Pregnancies ◽  
Main Factor

Four hundred and thirty four twins occurring in 220 women were studied during a period of 11 years (1969–1979) at Notre-Dame Hospital.Perinatal mortality (< 28 days) was compared before and after 1974, and the impact of ultrasound technique upon perinatal outcome was assessed during the second period (1974–1979). The main factor associated with perinatal mortality was low birth weight caused by either prematurity or intrauterine growth retardation.While fetal mortality remained unchanged within the two study periods, neonatal mortality decreased from 68.2/1,000 to 28.9/1,000 mainly due to increased survival rate of twins below 1,500 g at birth.With identical perinatal care during the same period, perinatal mortality and incidence of intrauterine growth-retarded twins remained unchanged despite early diagnosis by ultrasound.

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