Magnetic Resonance in Medical Sciences
Online ISSN : 1880-2206
Print ISSN : 1347-3182
ISSN-L : 1347-3182
Histological Properties of a Chemically Fixed Human Embryo Visualized with Quantitative Susceptibility Mapping
Toru Shirai Yasuhiko TeradaKatsumi KoseShigehito Yamada
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JOURNAL OPEN ACCESS Advance online publication

Article ID: tn.2023-0149


A chemically fixed Carnegie stage 23 (approximately 56 days of gestation) human embryo specimen was imaged using 3D spin-echo and gradient-echo sequences in a static magnetic field strength of 4.74T, and a quantitative susceptibility map was calculated using the 3D gradient-echo image. The acquired 3D microscopic images (90 μm cube voxel size) clarified the relationship between R2 (transverse relaxation rate), R2* (apparent transverse relaxation rate), and magnetic susceptibility in the heart, liver, kidney, and spinal cord. The results suggested that the R2* and magnetic susceptibility in each tissue were probably due to paramagnetic iron ions originating from erythrocytes. The large R2* (~130 s-1) and magnetic susceptibility (~0.122 ppm) in the liver were attributed to its hemopoietic function. A large magnetic susceptibility (~0.116 ppm) was also observed in the spinal cord, but we conclude that more detailed future studies are needed.

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