Medical Ultrasound Imaging
Tuesday, 14 May 2024
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Searchterm 'Sampling' found in 13 articles
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Power Mode
In power mode the amplitude (power) of color Doppler signals is displayed, regardless of the velocity. Power does not have negative values and is independent of sampling frequency. An aliasing artifact does not occur in power mode images. Caused by plotting the quantity enhanced by echo contrast agents in a power map, power mode is often used in contrast Doppler ultrasound examinations.
Also known as energy mode.
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Pregnancy Ultrasound
Pregnancy ultrasound plays a crucial role in monitoring the health and development of the fetus throughout pregnancy. It serves as a screening tool with various applications, including:
Verification of Due Date and Assessment of Pregnancy Health:
Fetal ultrasound examinations are used to accurately determine the estimated due date of the baby. They also aid in investigating the causes of bleeding during pregnancy and assessing the overall health and well-being of the fetus.
Evaluation of Fetal Development and Gender:
Ultrasound allows for visualizing the growth and development of the fetus, including assessing fetal anatomy and detecting any potential defects. Additionally, it can determine the gender of the baby, if desired by the parents.
Measurement of Amniotic Fluid and Placental Assessment:
Ultrasound is utilized to measure the amniotic fluid levels, which provide insights into fetal well-being and the functioning of the placenta. It also helps evaluate the condition of the placenta, ensuring proper nutrient and oxygen supply to the developing baby.
Early Pregnancy Confirmation and Multiple Fetuses Detection:
Around week five to seven of pregnancy, ultrasound is utilized to confirm the pregnancy, determine the fetal size, and detect the presence of multiple fetuses. It aids in distinguishing between intrauterine and ectopic pregnancies, ensuring appropriate management.
Third-Trimester Evaluation:
As the pregnancy progresses, ultrasound assessments are conducted to evaluate fetal size, position, growth, and the condition of the placenta. This information assists healthcare providers in monitoring the well-being of the fetus and planning for a safe delivery.
Guiding Procedures:
Ultrasound plays a vital role in guiding invasive procedures such as amniocentesis and chorionic villus sampling. It helps guide the placement of a needle to collect cells from the amniotic fluid or placenta, aiding in genetic testing and diagnosing potential fetal abnormalities.


See also Doppler Fluximetry in Pregnancy, Fetal Ultrasound, Obstetric and Gynecologic Ultrasound and Vaginal Probe.
Speckle
Speckle noise affects the quality of the ultrasound images and can mask pathology. This artifact can be reduced by using a phase insensitive technique, or by canceling the undesirable linear-phase representation. More system samplings (needs more channels and memory) or a fuzzy logic algorithm can filter out the speckle noise.
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 [last update: 2023-11-06 01:42:00]