Fetal Imaging Lecture 10: Techniques and Indications

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At what stage of pregnancy should MRI be avoided?

When ultrasound provides accurate information

In the second half of pregnancy

In the first half of pregnancy (correct)

During fetal surgery assessment

What is a contraindication for MRI?

Suspicion of fetal CNS anomalies

Fetal intrathoracic lesions

Morbidly adherent placenta

Maternal weight/size exceeds table recommendations or MRI caliber (correct)

When can gadolinium contrast with MRI be used?

When it significantly improves diagnostic performance and is expected to improve fetal or maternal outcome (correct)

Only when ultrasound provides accurate information

In complicated twin pregnancies

In the first half of pregnancy

What is an indication for MRI?

Fetal surgery assessment Signup and view all the answers

Why does MRI image quality suffer in the first half of pregnancy?

Due to the movement of the fetus Signup and view all the answers

What is not a contraindication for MRI?

Suspicion of fetal CNS anomalies Signup and view all the answers

What is the main advantage of Fetal MRI over other fetal imaging modalities?

It has a larger field of view for simultaneous evaluation of the whole fetal body and maternal structures Signup and view all the answers

What is the primary indication for performing a limited ultrasound in any trimester?

To answer a specific clinical question Signup and view all the answers

What is the frequency range of the abdominal transducer used in fetal ultrasound?

3 to 5 MHz Signup and view all the answers

What is a contraindication for the use of Gadolinium contrast in fetal imaging?

Pregnancy Signup and view all the answers

What is the primary purpose of a standard second-trimester scan in low-risk pregnancies?

To perform a simple fetal anatomic survey examination Signup and view all the answers

What is the frequency range of the transvaginal transducer used in fetal ultrasound?

9 to 12 MHz Signup and view all the answers

What is the primary purpose of obtaining a consent form from the patient?

To inform the patient of the potential risks associated with the scan Signup and view all the answers

What is the optimal patient position for an MRI scan of the fetus?

Supine position with the body coils over the abdomen and pelvis Signup and view all the answers

What is the primary sequence used for fetal brain assessment in MRI?

Single-shot T2-weighted sequence Signup and view all the answers

What is the purpose of the three-plane HASTE sequence in MRI?

To localize and plan sequences for fetal assessment Signup and view all the answers

What is the importance of instructing the patient to hold their breath during the MRI scan?

To reduce motion artifacts Signup and view all the answers

Why is it necessary to remove all metal objects before entering the MRI scanner room?

To prevent projectile injuries Signup and view all the answers

What is the primary factor that influences the diagnostic accuracy of ultrasound in fetal imaging?

Fetal position Signup and view all the answers

What is the advantage of ultrasound in fetal imaging when it comes to calcified lesions?

Better for calcified lesions, such as brain, liver, and placenta Signup and view all the answers

In what situations may MRI provide additional information in fetal imaging?

In cases where the diagnostic accuracy of ultrasound is compromised due to maternal adiposity or fetal ossification Signup and view all the answers

What is the primary concern regarding radiation exposure during pregnancy?

The gestational age of the fetus Signup and view all the answers

What is a limitation of ultrasound in fetal imaging?

It is operator dependent Signup and view all the answers

What is the advantage of MRI in fetal imaging compared to ultrasound?

It has superb soft tissue characterization and a large field of view Signup and view all the answers