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Quantitative fetal MRI

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https://www.readbyqxmd.com/read/29748201/quantitative-assessment-of-normal-fetal-brain-myelination-using-fast-macromolecular-proton-fraction-mapping
#1
V L Yarnykh, I Y Prihod'ko, A A Savelov, A M Korostyshevskaya
BACKGROUND AND PURPOSE: Fast macromolecular proton fraction mapping is a recently emerged MRI method for quantitative myelin imaging. Our aim was to develop a clinically targeted technique for macromolecular proton fraction mapping of the fetal brain and test its capability to characterize normal prenatal myelination. MATERIALS AND METHODS: This prospective study included 41 pregnant women (gestational age range, 18-38 weeks) without abnormal findings on fetal brain MR imaging performed for clinical indications...
May 10, 2018: AJNR. American Journal of Neuroradiology
https://www.readbyqxmd.com/read/29689556/assessment-of-placental-perfusion-in-the-preeclampsia-l-name-rat-model-with-high-field-dynamic-contrast-enhanced-mri
#2
Marie Lémery Magnin, Victor Fitoussi, Nathalie Siauve, Laetitia Pidial, Daniel Balvay, Gwennhael Autret, Charles André Cuenod, Olivier Clément, Laurent Julien Salomon
PURPOSE: To evaluate placental function and perfusion in a rat model of preeclampsia infused with L-nitro-arginine methyl ester (L-NAME) by dynamic contrast-enhanced (DCE) MRI using gadolinium chelates. METHODS: Pregnant female Sprague-Dawley rats were fitted on embryonic day 16 (E16) with subcutaneous osmotic minipumps loaded to deliver, continuously, L-NAME (50 mg/day per rat; case group) or saline solution (control group). DCE MRI was performed on E19 using gadolinium chelates and a 4...
April 24, 2018: Fetal Diagnosis and Therapy
https://www.readbyqxmd.com/read/29682894/3d-analysis-of-human-embryos-and-fetuses-using-digitized-datasets-from-the-kyoto-collection
#3
Tetsuya Takakuwa
Three-dimensional (3D) analysis of the human embryonic and early-fetal period has been performed using digitized datasets obtained from the Kyoto Collection, in which the digital datasets play a primary role in research. Datasets include magnetic resonance imaging (MRI) acquired with 1.5 T, 2.35 T, and 7 T magnet systems, phase-contrast X-ray computed tomography (CT), and digitized histological serial sections. Large, high-resolution datasets covering a broad range of developmental periods obtained with various methods of acquisition are key elements for the studies...
April 23, 2018: Anatomical Record: Advances in Integrative Anatomy and Evolutionary Biology
https://www.readbyqxmd.com/read/29531795/growth-of-the-colon-and-rectum-throughout-gestation-evaluation-with-fetal-mri
#4
Michalle Soudack Ben-Nun, Aviva Ben-Shlush, Lisa Raviv Zilka
Background: Congenital abnormalities of the gastrointestinal tract are increasingly being evaluated by prenatal magnetic resonance imaging (MRI). However, there is a paucity of reports describing the normal quantitative development of the fetal colon and rectum on MRI. Purpose: To provide growth curves of the MRI estimated diameter of the fetal colon and rectum as a function of gestational age. Material and Methods: This is a retrospective review of 191 singleton fetal MRI studies at 25-39 weeks of gestation...
March 2018: Acta Radiologica Open
https://www.readbyqxmd.com/read/29406268/therapeutic-n-acetyl-cysteine-nac-following-initiation-of-maternal-inflammation-attenuates-long-term-offspring-cerebral-injury-as-evident-in-magnetic-resonance-imaging-mri
#5
Hila Sharabi, Nizar Khatib, Yuval Ginsberg, Zeev Weiner, Michael G Ross, Blumenfeld-Katzir Tamar, Sasson Efrat, Hallak Mordechai, Ron Beloosesky
OBJECTIVE: Maternal infection/inflammation may induce fetal inflammatory responses, which have been associated with long-term offspring cerebral injury. We previously demonstrated that prophylactic N-Acetyl-Cysteine (NAC), administered prior to and following maternal lipopolysaccharide (LPS), reduced offspring cerebral injury as evident on MRI. In the present study, we used MRI to examine the effect of therapeutic NAC following maternal LPS-induced inflammation on neonatal brain injury...
February 8, 2018: Neuroscience
https://www.readbyqxmd.com/read/29359353/mri-quantification-of-human-fetal-o-2-delivery-rate-in-the-second-and-third-trimesters-of-pregnancy
#6
Ana E Rodríguez-Soto, Michael C Langham, Osheiza Abdulmalik, Erin K Englund, Nadav Schwartz, Felix W Wehrli
PURPOSE: The purpose of this study was to estimate fetal O2 delivery rate in vivo across a range of gestational ages. Toward this, a calibration equation for T2 -based oximetry was derived. METHODS: Umbilical cord blood of varying hematocrit (Hct) and oxygen saturation (HbO2 ) levels was prepared and T2 measured using a T2 -prepared balanced steady-state free-precession sequence at 1.5 T. The relationship between blood R2  = 1/T2 , HbO2 and Hct was established based on the model R2=(1-Hct)R2,plasma+Hct R2,RBC+k·Hct·(1-Hct)·(1-HbO2)2...
January 22, 2018: Magnetic Resonance in Medicine: Official Journal of the Society of Magnetic Resonance in Medicine
https://www.readbyqxmd.com/read/29353032/clinical-assessment-and-brain-findings-in-a-cohort-of-mothers-fetuses-and-infants-infected-with-zika-virus
#7
Magdalena Sanz Cortes, Ana Maria Rivera, Mayel Yepez, Carolina V Guimaraes, Israel Diaz Yunes, Alexander Zarutskie, Ivan Davila, Anil Shetty, Arun Mahadev, Saray Maria Serrano, Nicolas Castillo, Wesley Lee, Gregory Valentine, Michael Belfort, Guido Parra, Carrie Mohila, Kjersti Aagaard, Miguel Parra Saavedra
BACKGROUND: Congenital Zika virus (ZIKV) infection can be detected in both the presence and absence of microcephaly and manifests as a number of signs and symptoms that are detected clinically and by neuroimaging. However, to date, qualitative and quantitative measures for the purpose of diagnosis and prognosis are limited. OBJECTIVES: Main objectives of this study conducted on fetuses and infants with confirmed congenital Zika virus infection and detected brain abnormalities were (1) to assess the prevalence of microcephaly and the frequency of the anomalies that include a detailed description based on ultrasound and magnetic resonance imaging in fetuses and ultrasound, magnetic resonance imaging, and computed tomography imaging postnatally, (2) to provide quantitative measures of fetal and infant brain findings by magnetic resonance imaging with the use of volumetric analyses and diffusion-weighted imaging, and (3) to obtain additional information from placental and fetal histopathologic assessments and postnatal clinical evaluations...
April 2018: American Journal of Obstetrics and Gynecology
https://www.readbyqxmd.com/read/29028326/ratiometric-ph-imaging-with-a-co-ii-2-mri-probe-via-cest-effects-of-opposing-ph-dependences
#8
Agnes E Thorarinsdottir, Kang Du, James H P Collins, T David Harris
We report a Co2-based magnetic resonance (MR) probe that enables the ratiometric quantitation and imaging of pH through chemical exchange saturation transfer (CEST). This approach is illustrated in a series of air- and water-stable Co(II)2 complexes featuring CEST-active tetra(carboxamide) and/or hydroxyl-substituted bisphosphonate ligands. For the complex bearing both ligands, variable-pH CEST and NMR analyses reveal highly shifted carboxamide and hydroxyl peaks with intensities that increase and decrease with increasing pH, respectively...
October 30, 2017: Journal of the American Chemical Society
https://www.readbyqxmd.com/read/28948372/comparative-anatomy-on-3-d-mri-of-the-urogenital-sinus-and-the-periurethral-area-before-and-during-the-second-stage-of-labor-during-childbirth
#9
Jean-Christophe Maran, Lucie Cassagnes, Vincent Delmas, Dominique Musset, René Frydman, Gérard Mage, Michel Canis, Louis Boyer, Olivier Ami
PURPOSE OF THE STUDY: To describe the observable MRI changes in the urogenital sinus during the second stage of labor and delivery by comparing the changes in the positions of the anatomical structures of the maternal perineum using MRI-based vector 3-D models. MATERIALS AND METHODS: Seven pregnant women underwent 3-D MRI sequences using a Philips 1 T Panorama open MRI during the pre-labor period and during the second stage of labor. A 3-D vector reconstruction platform (BABYPROGRESS, France) enabled the transformation of volumes of 2-D images into finite element meshes...
September 26, 2017: Surgical and Radiologic Anatomy: SRA
https://www.readbyqxmd.com/read/28880160/pvr-patch-to-volume-reconstruction-for-large-area-motion-correction-of-fetal-mri
#10
Amir Alansary, Martin Rajchl, Steven G McDonagh, Maria Murgasova, Mellisa Damodaram, David F A Lloyd, Alice Davidson, Mary Rutherford, Joseph V Hajnal, Daniel Rueckert, Bernhard Kainz
In this paper, we present a novel method for the correction of motion artifacts that are present in fetal magnetic resonance imaging (MRI) scans of the whole uterus. Contrary to current slice-to-volume registration (SVR) methods, requiring an inflexible anatomical enclosure of a single investigated organ, the proposed patch-to-volume reconstruction (PVR) approach is able to reconstruct a large field of view of non-rigidly deforming structures. It relaxes rigid motion assumptions by introducing a specific amount of redundant information that is exploited with parallelized patchwise optimization, super-resolution, and automatic outlier rejection...
October 2017: IEEE Transactions on Medical Imaging
https://www.readbyqxmd.com/read/28862023/what-is-the-most-suitable-mr-signal-index-for-quantitative-evaluation-of-placental-function-using-half-fourier-acquisition-single-shot-turbo-spin-echo-compared-with-t2-relaxation-time
#11
Kyoko Nakao Kameyama, Aki Kido, Yuki Himoto, Yusaku Moribata, Sachiko Minamiguchi, Ikuo Konishi, Kaori Togashi
Background Half-Fourier acquisition single-shot turbo spin-echo (HASTE) imaging is now widely used for placental and fetal imaging because of its rapidity and low sensitivity to fetal movement. If placental dysfunction is also predicted by quantitative value obtained from HASTE image, then it might be beneficial for evaluating placental wellbeing. Purpose To ascertain the most suitable magnetic resonance (MR) signal indexes reflecting placental function using HASTE imaging. Material and Methods This retrospective study included 37 consequent patients who had given informed consent to MR imaging (MRI) examinations...
January 1, 2017: Acta Radiologica
https://www.readbyqxmd.com/read/28837138/in-vivo-assessment-of-placental-and-brain-volumes-in-growth-restricted-fetuses-with-and-without-fetal-doppler-changes-using-quantitative-3d-mri
#12
N Andescavage, A duPlessis, M Metzler, D Bulas, G Vezina, M Jacobs, S N Iqbal, A Baschat, C Limperopoulos
OBJECTIVE: The relationship between placental and fetal brain growth is poorly understood and difficult to assess. The objective of this study was to interrogate placental and fetal brain growth in healthy pregnancies and those complicated by fetal growth restriction (FGR). STUDY DESIGN: In a prospective, observational study, pregnant women with normal pregnancies or pregnancies complicated by FGR underwent fetal magnetic resonance imaging (MRI). Placental, global and regional brain volumes were calculated...
December 2017: Journal of Perinatology: Official Journal of the California Perinatal Association
https://www.readbyqxmd.com/read/28782259/prenatal-assessment-of-cerebellar-vermian-lobulation-fetal-mri-with-3-tesla-post-mortem-correlation
#13
Gregor O Dovjak, Peter C Brugger, Gerlinde M Gruber, Jae W Song, Michael Weber, Georg Langs, Dieter Bettelheim, Daniela Prayer, Gregor Kasprian
OBJECTIVES: To optimize the imaging assessment of fetal hindbrain malformations, this observational MRI study aimed to provide quantitative biometric data in normal vermian development in human fetal brains in vivo. METHODS: In this retrospective, review board approved study, 78 fetuses (18-32 gestational weeks (GW)) scanned prenatally at 1.5T, and seven fetuses (16-30GW), scanned within 24 hours post-mortem at 3T,were included. All fetal brains were segmented on a T2-weighted midline sagittal slice...
August 6, 2017: Ultrasound in Obstetrics & Gynecology
https://www.readbyqxmd.com/read/28774363/-quantitative-evaluation-of-white-matter-development-in-fetus-with-growth-restriction-by-diffusion-tensor-imaging
#14
Hua-Wei Wang, Bing Wu, Jing Liu, Fang Liu, Xin-Huai Wu, Ming-Mei Ge
OBJECTIVE: To investigate whether fetal growth restriction (FGR) has an adverse effect on white matter development. METHODS: A total of 28 full-term small for gestational age (SGA) infants were enrolled as study subjects and 15 full-term appropriate for gestational age infants were enrolled as control group. Conventional head magnetic resonance imaging (MRI) and diffusion tensor imaging (DTI) were performed for all infants. The white matter was divided into 122 regions...
August 2017: Zhongguo Dang Dai Er Ke za Zhi, Chinese Journal of Contemporary Pediatrics
https://www.readbyqxmd.com/read/28653363/quiet-echo-planar-imaging-for-functional-and-diffusion-mri
#15
Jana Hutter, Anthony N Price, Lucilio Cordero-Grande, Shaihan Malik, Giulio Ferrazzi, Andreia Gaspar, Emer J Hughes, Daan Christiaens, Laura McCabe, Torben Schneider, Mary A Rutherford, Joseph V Hajnal
PURPOSE: To develop a purpose-built quiet echo planar imaging capability for fetal functional and diffusion scans, for which acoustic considerations often compromise efficiency and resolution as well as angular/temporal coverage. METHODS: The gradient waveforms in multiband-accelerated single-shot echo planar imaging sequences have been redesigned to minimize spectral content. This includes a sinusoidal read-out with a single fundamental frequency, a constant phase encoding gradient, overlapping smoothed CAIPIRINHA blips, and a novel strategy to merge the crushers in diffusion MRI...
March 2018: Magnetic Resonance in Medicine: Official Journal of the Society of Magnetic Resonance in Medicine
https://www.readbyqxmd.com/read/28652972/in-utero-diffusion-tensor-imaging-of-the-fetal-brain-a-reproducibility-study
#16
András Jakab, Ruth Tuura, Christian Kellenberger, Ianina Scheer
Our purpose was to evaluate the within-subject reproducibility of in utero diffusion tensor imaging (DTI) metrics and the visibility of major white matter structures. Images for 30 fetuses (20-33. postmenstrual weeks, normal neurodevelopment: 6 cases, cerebral pathology: 24 cases) were acquired on 1.5 T or 3.0 T MRI. DTI with 15 diffusion-weighting directions was repeated three times for each case, TR/TE: 2200/63 ms, voxel size: 1 ∗ 1 mm, slice thickness: 3-5 mm, b-factor: 700 s/mm(2). Reproducibility was evaluated from structure detectability, variability of DTI measures using the coefficient of variation (CV), image correlation and structural similarity across repeated scans for six selected structures...
2017: NeuroImage: Clinical
https://www.readbyqxmd.com/read/28623277/in-vivo-quantification-of-placental-insufficiency-by-bold-mri-a-human-study
#17
Jie Luo, Esra Abaci Turk, Carolina Bibbo, Borjan Gagoski, Drucilla J Roberts, Mark Vangel, Clare M Tempany-Afdhal, Carol Barnewolt, Judy Estroff, Arvind Palanisamy, William H Barth, Chloe Zera, Norberto Malpica, Polina Golland, Elfar Adalsteinsson, Julian N Robinson, Patricia Ellen Grant
Fetal health is critically dependent on placental function, especially placental transport of oxygen from mother to fetus. When fetal growth is compromised, placental insufficiency must be distinguished from modest genetic growth potential. If placental insufficiency is present, the physician must trade off the risk of prolonged fetal exposure to placental insufficiency against the risks of preterm delivery. Current ultrasound methods to evaluate the placenta are indirect and insensitive. We propose to use Blood-Oxygenation-Level-Dependent (BOLD) MRI with maternal hyperoxia to quantitatively assess mismatch in placental function in seven monozygotic twin pairs naturally matched for genetic growth potential...
June 16, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28619840/does-3t-fetal-mri-improve-image-resolution-of-normal-brain-structures-between-20-and-24-weeks-gestational-age
#18
G Priego, N J Barrowman, J Hurteau-Miller, E Miller
BACKGROUND AND PURPOSE: Stronger magnetic fields have the potential to improve fetal image resolution. Our objective was to detect whether there was better anatomic resolution of brain structures in fetuses imaged with a 3T magnet compared with a 1.5T magnet. MATERIALS AND METHODS: Multiple cerebral and facial anatomic structures were retrospectively assessed in 28 fetal MR imaging scans with normal findings (12 at 3T and 16 at 1.5T) with a 0 -3 grading score. Fetuses were assessed during the second trimesters (gestational age, 20 -24 weeks)...
June 15, 2017: AJNR. American Journal of Neuroradiology
https://www.readbyqxmd.com/read/28560153/sexual-dimorphism-of-volume-reduction-but-not-cognitive-deficit-in-fetal-alcohol-spectrum-disorders-a-combined-diffusion-tensor-imaging-cortical-thickness-and-brain-volume-study
#19
Sarah Treit, Zhang Chen, Dongming Zhou, Lauren Baugh, Carmen Rasmussen, Gail Andrew, Jacqueline Pei, Christian Beaulieu
Quantitative magnetic resonance imaging (MRI) has revealed abnormalities in brain volumes, cortical thickness and white matter microstructure in fetal alcohol spectrum disorders (FASD); however, no study has reported all three measures within the same cohort to assess the relative magnitude of deficits, and few studies have examined sex differences. Participants with FASD (n = 70; 30 females; 5-32 years) and healthy controls (n = 74; 35 females; 5-32 years) underwent cognitive testing and MRI to assess cortical thickness, regional brain volumes and fractional anisotropy (FA)/mean diffusivity (MD) of white matter tracts...
2017: NeuroImage: Clinical
https://www.readbyqxmd.com/read/28304179/discrepancy-in-fetal-head-biometry-between-ultrasound-and-mri-in-suspected-microcephalic-fetuses
#20
Gal Yaniv, Eldad Katorza, Vered Tsehmaister Abitbol, Arik Eisenkraft, Ronen Bercovitz, Salim Bader, Chen Hoffmann
Background Microcephaly is one of the most common fetal structural abnormalities, and prenatal microcephaly is considered a group I malformation of cortical development diagnosed according to ultrasound (US) skull measurements. Purpose To evaluate the agreement between fetal head US and magnetic resonance imaging (MRI) biometric measurements of suspected microcephalic fetuses. Material and Methods This institutional review board-approved retrospective study with waived informed consent included 180 pregnant women and was conducted at our medical center from March 2011 to April 2013...
December 2017: Acta Radiologica
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