Ultrasound Imaging Fundamentals

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What is the primary concern when using ultrasound contrast agents?

The risk of inertial cavitation is higher (correct)
The transducer may overheat
The contrast agents may cause fetal damage
The ultrasound signal may be weak

Why is routine scanning by spectral and color Doppler during the embryonic period rarely indicated?

It produces high intensities that may be harmful (correct)
It may cause fetal damage due to teratogenic agents
The ultrasound signal may not penetrate the bone
It is not effective during the embryonic period

What is the purpose of limiting exposure time and acoustic output during ultrasound examinations?

To obtain better image quality
To make the examination more comfortable for the patient
To prevent heating of adjacent tissues (correct)
To reduce the cost of the examination

Why is the transvaginal approach a concern during ultrasound examinations?

Heat is generated at the transducer surface (B) Signup and view all the answers

What is the primary risk of damage to the fetus during ultrasound examinations?

The risk of teratogenic agents in the first trimester (D) Signup and view all the answers

What is the reason for not performing routine ultrasound examinations for purely entertainment purposes?

It is not medically indicated (C) Signup and view all the answers

What is the term used for the angle at which the ultrasound beam is directed towards the object of interest?

Angle of insonation (C) Signup and view all the answers

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 (A) Signup and view all the answers

What is the name of the ultrasound mode that is no longer used in clinical obstetric and gynecologic ultrasound imaging?

A-mode (C) Signup and view all the answers

What is the purpose of calipers in ultrasound imaging, as shown in Figure 1.5?

To measure the maximal vertical pocket of amniotic fluid (B) Signup and view all the answers

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 (B) Signup and view all the answers

What is the format in which the ultrasound image is created from the returning echoes?

Grey scale format (A) Signup and view all the answers

What is the purpose of the M-mode display in ultrasound imaging?

To assess the motion of the fetal cardiac chambers and valves (C) Signup and view all the answers

What is the principle behind color and spectral (pulsed) Doppler modes?

The Doppler principle (effect) (B) Signup and view all the answers

What is the echogenicity of the amniotic fluid according to Table 1.4?

Anechoic (C) Signup and view all the answers

What is the orientation of the axes in the M-mode display?

Time on the x-axis and depth on the y-axis (B) Signup and view all the answers

What is the meaning of the term 'echogenic' in the context of ultrasound imaging?

Refers to the reflection of ultrasound waves (A) Signup and view all the answers

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 (A) Signup and view all the answers