Three-dimensional magnetic resonance imaging of fetal head molding and brain shape changes during the second stage of labor

AbstractAim:Fetal skull molding is important for the adaptation of the head to the birth canal during vaginal delivery. Importantly, the fetal head must rotate around the maternal symphysis pubis. The goals of this analysis were to observe a human birth in real-time using an open magnetic resonance imaging (MRI) scanner and describe the fetal head configuration during expulsion.Methods:Real-time cinematic MRI series (TSE single-shot sequence, TR 1600 ms, TE 150 ms) were acquired from the midsagittal plane of the maternal pelvis during the active second stage of labor at 37 weeks of gestation. Frame-by-frame analyses were performed to measure the frontooccipital diameter (FOD) and distance from the vertex to the base of the fetal skull.Results:During vaginal delivery in an occiput anterior position, the initial FOD was 10.3 cm. When expulsion began, the fetal skull was deformed and elongated, with the FOD increasing to 10.8 cm and 11.2 cm at crowning. In contrast, the distance from the vertex to the base of the skull was reduced from 6.4 cm to 5.6 cm at expulsion.Conclusions:Fetal head molding is the change in the fetal head due to the forces of labor. The biomechanics of this process are poorly understood. Our visualization of the normal mechanism of late second-stage labor shows that MRI technology can for the first time help define the changes in the diameters of the fetal head during active labor.

Download Full-text

P3189 The true left atrial anatomy: lessons to be learned from three-dimensional magnetic resonance imaging

European Heart Journal ◽

10.1016/s0195-668x(03)95819-2 ◽

2003 ◽

Vol 24 (5) ◽

pp. 596

Author(s):

S ERNST

Keyword(s):

Magnetic Resonance Imaging ◽

Magnetic Resonance ◽

Left Atrial ◽

Three Dimensional ◽

Resonance Imaging

Download Full-text

Faculty Opinions recommendation of Magnetic resonance imaging-based three-dimensional bone shape of the knee predicts onset of knee osteoarthritis: data from the osteoarthritis initiative.

Faculty Opinions – Post-Publication Peer Review of the Biomedical Literature ◽

10.3410/f.718116208.793484286 ◽

2013 ◽

Author(s):

Johanne Martel-Pelletier ◽

Jean-Pierre Raynauld

Keyword(s):

Magnetic Resonance Imaging ◽

Magnetic Resonance ◽

Knee Osteoarthritis ◽

Three Dimensional ◽

Resonance Imaging ◽

Osteoarthritis Initiative

Download Full-text

Computed Tomography and Magnetic Resonance Imaging-aided Diagnosis of Primary Essential Cutis Verticis Gyrata: A Case Report with 5-year Follow-up and Review of the Literature

Current Medical Imaging Formerly Current Medical Imaging Reviews ◽

10.2174/1573405614666181005113448 ◽

2019 ◽

Vol 15 (9) ◽

pp. 906-910

Author(s):

Hongzhang Zhu ◽

Shi-Ting Feng ◽

Xingqi Zhang ◽

Zunfu Ke ◽

Ruixi Zeng ◽

...

Keyword(s):

Magnetic Resonance Imaging ◽

Magnetic Resonance ◽

Three Dimensional ◽

Stable Condition ◽

Resonance Imaging ◽

Mri Findings ◽

Cutis Verticis Gyrata ◽

Essential Form ◽

History Of ◽

Magnetic Resonance Imaging Mri

Background: Cutis Verticis Gyrata (CVG) is a rare skin disease caused by overgrowth of the scalp, presenting as cerebriform folds and wrinkles. CVG can be classified into two forms: primary (essential and non-essential) and secondary. The primary non-essential form is often associated with neurological and ophthalmological abnormalities, while the primary essential form occurs without associated comorbidities. Discussion: We report on a rare case of primary essential CVG with a 4-year history of normal-colored scalp skin mass in the parietal-occipital region without symptom in a 34-year-old male patient, retrospectively summarizing his pathological and Computer Tomography (CT) and magnetic resonance imaging (MRI) findings. The major clinical observations on the CT and MR sectional images include a thickened dermis and excessive growth of the scalp, forming the characteristic scalp folds. With the help of CT and MRI Three-dimensional (3D) reconstruction techniques, the characteristic skin changes could be displayed intuitively, providing more evidence for a diagnosis of CVG. At the 5-year followup, there were no obvious changes in the lesion. Conclusion: Based on our observations, we propose that not all patients with primary essential CVG need surgical intervention, and continuous clinical observation should be an appropriate therapy for those in stable condition.

Download Full-text

Alteration within the Hippocampal Volume in Patients with LHON Disease—7 Tesla MRI Study

Journal of Clinical Medicine ◽

10.3390/jcm10010014 ◽

2020 ◽

Vol 10 (1) ◽

pp. 14

Author(s):

Cezary Grochowski ◽

Kamil Jonak ◽

Marcin Maciejewski ◽

Andrzej Stępniewski ◽

Mansur Rahnama-Hezavah

Keyword(s):

Magnetic Resonance Imaging ◽

Magnetic Resonance ◽

Molecular Layer ◽

Three Dimensional ◽

Hippocampal Volume ◽

7 Tesla ◽

Diagnostic Process ◽

Resonance Imaging ◽

The Right

Purpose: The aim of this study was to assess the volumetry of the hippocampus in the Leber’s hereditary optic neuropathy (LHON) of blind patients. Methods: A total of 25 patients with LHON were randomly included into the study from the national health database. A total of 15 patients were selected according to the inclusion criteria. The submillimeter segmentation of the hippocampus was based on three-dimensional spoiled gradient recalled acquisition in steady state (3D-SPGR) BRAVO 7T magnetic resonance imaging (MRI) protocol. Results: Statistical analysis revealed that compared to healthy controls (HC), LHON subjects had multiple significant differences only in the right hippocampus, including a significantly higher volume of hippocampal tail (p = 0.009), subiculum body (p = 0.018), CA1 body (p = 0.002), hippocampal fissure (p = 0.046), molecular layer hippocampus (HP) body (p = 0.014), CA3 body (p = 0.006), Granule Cell (GC) and Molecular Layer (ML) of the Dentate Gyrus (DG)–GC ML DG body (p = 0.003), CA4 body (p = 0.001), whole hippocampal body (p = 0.018), and the whole hippocampus volume (p = 0.023). Discussion: The ultra-high-field magnetic resonance imaging allowed hippocampus quality visualization and analysis, serving as a powerful in vivo diagnostic tool in the diagnostic process and LHON disease course assessment. The study confirmed previous reports regarding volumetry of hippocampus in blind individuals.

Download Full-text