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Pictorial essay: MRI of the fetal brain.

B GR, Ramamurthy B - Indian J Radiol Imaging (2009)

Bottom Line: Subtle or inconclusive USG abnormalities can be confirmed or ruled out by MRI.There have been no reports of deleterious effects of MRI on the fetus.A few case examples are presented to illustrate the advantages of MRI.

View Article: PubMed Central - PubMed

ABSTRACT
MRI is a useful supplement to USG for the assessment of fetal brain malformations. Superior soft tissue contrast and the ability to depict sulcation and myelination are the strengths of MRI. Subtle or inconclusive USG abnormalities can be confirmed or ruled out by MRI. In some cases, additional findings detected with MRI often help in arriving at a definitive diagnosis, which is necessary for parental counseling and for guiding management. Fast T2W sequences form the basis of fetal MRI. There have been no reports of deleterious effects of MRI on the fetus. A few case examples are presented to illustrate the advantages of MRI.

No MeSH data available.


Related in: MedlinePlus

Single live gestation at 33 weeks. T2W (A) and gradient-echo T2W (T2*) MRI images show intraventricular (arrows) and periventricular (arrowhead) hemorrhage. Fetal blood sampling was negative for TORCH IgMs. A platelet count of 50,000 / mm3 was noted. Pregnancy ended with a stillbirth at 35 weeks.
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Figure 0002: Single live gestation at 33 weeks. T2W (A) and gradient-echo T2W (T2*) MRI images show intraventricular (arrows) and periventricular (arrowhead) hemorrhage. Fetal blood sampling was negative for TORCH IgMs. A platelet count of 50,000 / mm3 was noted. Pregnancy ended with a stillbirth at 35 weeks.

Mentions: Fetal motion significantly degrades image quality. For this reason, fast T2W single-shot imaging techniques such as single-shot fast spin-echo (SSFSE), half-Fourier acquisition turbo spin-echo (HASTE), and rapid acquisition with relaxation enhancement (RARE) have been the most widely used pulse sequences for fetal MRI.[21–24] Such fast acquisition sequences provide good contrast and spatial resolution and are suitable for surface delineation, sulcational analysis, and biometry [Figure 1]. Studies mention a lag of one week of the brain development compared to the neuroanatomic findings.[25] Gradient-echo T2W images (T2*) are accurate in the detection of chronic hemorrhagic lesions and calcifications[5] [Figure 2]. T1W images are well suited for demonstrating small hyperintense lesions like tubers, calcification, lipomas, and laminar necrosis[2126–29] [Figure 3]. There are reports which mention a good correlation between USG and MRI measurements of biparietal diameter, head circumference and cerebellar width.[30–32] An initial fast localizing sequence is performed; sequences are then acquired in orthogonal planes relative to the immediately preceding plane. Imaging planes are chosen to represent sections relative to the fetus.[519]


Pictorial essay: MRI of the fetal brain.

B GR, Ramamurthy B - Indian J Radiol Imaging (2009)

Single live gestation at 33 weeks. T2W (A) and gradient-echo T2W (T2*) MRI images show intraventricular (arrows) and periventricular (arrowhead) hemorrhage. Fetal blood sampling was negative for TORCH IgMs. A platelet count of 50,000 / mm3 was noted. Pregnancy ended with a stillbirth at 35 weeks.
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC2747421&req=5

Figure 0002: Single live gestation at 33 weeks. T2W (A) and gradient-echo T2W (T2*) MRI images show intraventricular (arrows) and periventricular (arrowhead) hemorrhage. Fetal blood sampling was negative for TORCH IgMs. A platelet count of 50,000 / mm3 was noted. Pregnancy ended with a stillbirth at 35 weeks.
Mentions: Fetal motion significantly degrades image quality. For this reason, fast T2W single-shot imaging techniques such as single-shot fast spin-echo (SSFSE), half-Fourier acquisition turbo spin-echo (HASTE), and rapid acquisition with relaxation enhancement (RARE) have been the most widely used pulse sequences for fetal MRI.[21–24] Such fast acquisition sequences provide good contrast and spatial resolution and are suitable for surface delineation, sulcational analysis, and biometry [Figure 1]. Studies mention a lag of one week of the brain development compared to the neuroanatomic findings.[25] Gradient-echo T2W images (T2*) are accurate in the detection of chronic hemorrhagic lesions and calcifications[5] [Figure 2]. T1W images are well suited for demonstrating small hyperintense lesions like tubers, calcification, lipomas, and laminar necrosis[2126–29] [Figure 3]. There are reports which mention a good correlation between USG and MRI measurements of biparietal diameter, head circumference and cerebellar width.[30–32] An initial fast localizing sequence is performed; sequences are then acquired in orthogonal planes relative to the immediately preceding plane. Imaging planes are chosen to represent sections relative to the fetus.[519]

Bottom Line: Subtle or inconclusive USG abnormalities can be confirmed or ruled out by MRI.There have been no reports of deleterious effects of MRI on the fetus.A few case examples are presented to illustrate the advantages of MRI.

View Article: PubMed Central - PubMed

ABSTRACT
MRI is a useful supplement to USG for the assessment of fetal brain malformations. Superior soft tissue contrast and the ability to depict sulcation and myelination are the strengths of MRI. Subtle or inconclusive USG abnormalities can be confirmed or ruled out by MRI. In some cases, additional findings detected with MRI often help in arriving at a definitive diagnosis, which is necessary for parental counseling and for guiding management. Fast T2W sequences form the basis of fetal MRI. There have been no reports of deleterious effects of MRI on the fetus. A few case examples are presented to illustrate the advantages of MRI.

No MeSH data available.


Related in: MedlinePlus