24 Questions
At what stage of pregnancy should MRI be avoided?
In the first half of pregnancy
What is a contraindication for MRI?
Maternal weight/size exceeds table recommendations or MRI caliber
When can gadolinium contrast with MRI be used?
When it significantly improves diagnostic performance and is expected to improve fetal or maternal outcome
What is an indication for MRI?
Fetal surgery assessment
Why does MRI image quality suffer in the first half of pregnancy?
Due to the movement of the fetus
What is not a contraindication for MRI?
Suspicion of fetal CNS anomalies
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
What is the primary indication for performing a limited ultrasound in any trimester?
To answer a specific clinical question
What is the frequency range of the abdominal transducer used in fetal ultrasound?
3 to 5 MHz
What is a contraindication for the use of Gadolinium contrast in fetal imaging?
Pregnancy
What is the primary purpose of a standard second-trimester scan in low-risk pregnancies?
To perform a simple fetal anatomic survey examination
What is the frequency range of the transvaginal transducer used in fetal ultrasound?
9 to 12 MHz
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
What is the optimal patient position for an MRI scan of the fetus?
Supine position with the body coils over the abdomen and pelvis
What is the primary sequence used for fetal brain assessment in MRI?
Single-shot T2-weighted sequence
What is the purpose of the three-plane HASTE sequence in MRI?
To localize and plan sequences for fetal assessment
What is the importance of instructing the patient to hold their breath during the MRI scan?
To reduce motion artifacts
Why is it necessary to remove all metal objects before entering the MRI scanner room?
To prevent projectile injuries
What is the primary factor that influences the diagnostic accuracy of ultrasound in fetal imaging?
Fetal position
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
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
What is the primary concern regarding radiation exposure during pregnancy?
The gestational age of the fetus
What is a limitation of ultrasound in fetal imaging?
It is operator dependent
What is the advantage of MRI in fetal imaging compared to ultrasound?
It has superb soft tissue characterization and a large field of view
Learn about the techniques involved in performing fetal imaging, including indications and contraindications, patient preparation, and fetal MRI. Understand the role of ultrasound and MRI in fetal imaging.
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