18 Questions
What is the primary concern when using ultrasound contrast agents?
The risk of inertial cavitation is higher
Why is routine scanning by spectral and color Doppler during the embryonic period rarely indicated?
It produces high intensities that may be harmful
What is the purpose of limiting exposure time and acoustic output during ultrasound examinations?
To prevent heating of adjacent tissues
Why is the transvaginal approach a concern during ultrasound examinations?
Heat is generated at the transducer surface
What is the primary risk of damage to the fetus during ultrasound examinations?
The risk of teratogenic agents in the first trimester
What is the reason for not performing routine ultrasound examinations for purely entertainment purposes?
It is not medically indicated
What is the term used for the angle at which the ultrasound beam is directed towards the object of interest?
Angle of insonation
What type of image is produced on the monitor when the ultrasound beam encounters a weak reflector, such as fluid or soft tissue?
Hypoechoic image
What is the name of the ultrasound mode that is no longer used in clinical obstetric and gynecologic ultrasound imaging?
A-mode
What is the purpose of calipers in ultrasound imaging, as shown in Figure 1.5?
To measure the maximal vertical pocket of amniotic fluid
What is the term used to describe the image produced on the monitor when the ultrasound beam encounters a strong reflector, such as bone?
Hyperechoic image
What is the format in which the ultrasound image is created from the returning echoes?
Grey scale format
What is the purpose of the M-mode display in ultrasound imaging?
To assess the motion of the fetal cardiac chambers and valves
What is the principle behind color and spectral (pulsed) Doppler modes?
The Doppler principle (effect)
What is the echogenicity of the amniotic fluid according to Table 1.4?
Anechoic
What is the orientation of the axes in the M-mode display?
Time on the x-axis and depth on the y-axis
What is the meaning of the term 'echogenic' in the context of ultrasound imaging?
Refers to the reflection of ultrasound waves
What is the primary use of the M-mode display in current ultrasound imaging?
To assess the motion of the fetal cardiac chambers and valves
Learn how ultrasound imaging works, including how different types of tissues affect the reflection of the ultrasound beam and how the image is created on the monitor. Understand the importance of the angle of incidence for optimal image quality.
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