To date, ultrasound and Doppler study took the bottom of the main places in the technique of complex examination of pregnant women. What is an ultrasound studies in obstetrics: Technology for images based on the change in power and frequency of ultrasonic waves reflected from the object of its research on fabrics that affects the ultrasonic radiation, converting it into heat energy. Thermal effect on tissues depends on: Characteristics of devices (power) mode (UDC, pulsed Doppler and B-mode), exposure time (research) This implies that the dose in hundredths of W/cm2. small to cause an embryo or fetus obvious harm. Despite the fact that no reliable information about the damaging effect of this imagistic a product of conception, to conduct ultrasound and Doppler studies during pregnancy should only be indicated. In the early stages pregnancy is advisable to use transvaginal ultrasound (TV U.S.), allowing a detailed analysis of anatomical structures of the embryo and ovum needed to assess nature of pregnancy and the forecast.
In the 1 st trimester to assess the following criteria for the state of fetal eggs and embryos: Determination of the primary visualization of the embryo in the uterus. Measurement and assessment of the crown-rump length embryo. Evaluation of the viability of the embryo. The study of the anatomical structure of the embryo. Measuring the size of the cavities ovum. Determination of the contents of the cavities ovum.
Score yolk sac. The study of chorion. Screening time studies during pregnancy: 10-11 weeks 18-24 weeks 28-32 weeks of the study in terms of 10-11 weeks are crucial for early detection of possible fetal malformations (Down's syndrome and heart defects). Doppler conducted with 18 weeks of gestation provides an estimate of the rate of blood flow and to identify possible irregularities in utero-placental-fruit system. There are individual time studies, depending on the identified pathology. Unfortunately not all the vices with ultrasonic scanning.