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Quantitative fetal MRI

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https://www.readbyqxmd.com/read/29028326/ratiometric-ph-imaging-with-a-co-ii-2-mri-probe-via-cest-effects-of-opposing-ph-dependences
#1
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
#2
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
#3
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 patch-wise optimization, super-resolution, and automatic outlier rejection...
September 1, 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
#4
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
#5
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...
August 24, 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
#6
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
#7
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
#8
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...
June 26, 2017: 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
#9
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
#10
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
#11
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
#12
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
#13
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...
January 1, 2017: Acta Radiologica
https://www.readbyqxmd.com/read/28269170/sulcal-curve-extraction-using-laplace-beltrami-eigenfunction-level-sets
#14
Rosita Shishegar, Mary Tolcos, David W Walker, Leigh A Johnston
The complexity of the human cortex is demonstrated in the intricate pattern of gyri and sulci that arise from the cortical folding process during development. Quantitative assessment of cortical folding is important in the definition of normal brain development and provides insight into neurodevelopmental disorders. In this work, a method for sulcal curve extraction is proposed that combines the advantages of previously proposed depth based and curvature based methods. The technique, derived from Laplace Beltrami eigenfunction level sets, maps mean curvature on the level sets, and incorporates depth information using extracted sulci and gyri, a characteristic previously attributed only to depth based methods...
August 2016: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/28252405/placenta-maps-in-utero-placental-health-assessment-of-the-human-fetus
#15
Haichao Miao, Gabriel Mistelbauer, Alexey Karimov, Amir Alansary, Alice Davidson, David F A Lloyd, Mellisa Damodaram, Lisa Story, Jana Hutter, Joseph V Hajnal, Mary Rutherford, Bernhard Preim, Bernhard Kainz, M Eduard Groller
The human placenta is essential for the supply of the fetus. To monitor the fetal development, imaging data is acquired using (US). Although it is currently the gold-standard in fetal imaging, it might not capture certain abnormalities of the placenta. (MRI) is a safe alternative for the in utero examination while acquiring the fetus data in higher detail. Nevertheless, there is currently no established procedure for assessing the condition of the placenta and consequently the fetal health. Due to maternal respiration and inherent movements of the fetus during examination, a quantitative assessment of the placenta requires fetal motion compensation, precise placenta segmentation and a standardized visualization, which are challenging tasks...
June 2017: IEEE Transactions on Visualization and Computer Graphics
https://www.readbyqxmd.com/read/28227400/sulcal-curve-extraction-using-laplace-beltrami-eigenfunction-level-sets
#16
Rosita Shishegar, Mary Tolcos, David W Walker, Leigh A Johnston, Rosita Shishegar, Mary Tolcos, David W Walker, Leigh A Johnston, David W Walker, Mary Tolcos, Leigh A Johnston, Rosita Shishegar
The complexity of the human cortex is demonstrated in the intricate pattern of gyri and sulci that arise from the cortical folding process during development. Quantitative assessment of cortical folding is important in the definition of normal brain development and provides insight into neurodevelopmental disorders. In this work, a method for sulcal curve extraction is proposed that combines the advantages of previously proposed depth based and curvature based methods. The technique, derived from Laplace Beltrami eigenfunction level sets, maps mean curvature on the level sets, and incorporates depth information using extracted sulci and gyri, a characteristic previously attributed only to depth based methods...
August 2016: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/28195417/toward-the-automatic-quantification-of-in-utero-brain-development-in-3d-structural-mri-a-review
#17
REVIEW
Oualid M Benkarim, Gerard Sanroma, Veronika A Zimmer, Emma Muñoz-Moreno, Nadine Hahner, Elisenda Eixarch, Oscar Camara, Miguel Angel González Ballester, Gemma Piella
Investigating the human brain in utero is important for researchers and clinicians seeking to understand early neurodevelopmental processes. With the advent of fast magnetic resonance imaging (MRI) techniques and the development of motion correction algorithms to obtain high-quality 3D images of the fetal brain, it is now possible to gain more insight into the ongoing maturational processes in the brain. In this article, we present a review of the major building blocks of the pipeline toward performing quantitative analysis of in vivo MRI of the developing brain and its potential applications in clinical settings...
February 14, 2017: Human Brain Mapping
https://www.readbyqxmd.com/read/28152240/spatiotemporal-alignment-of-in-utero-bold-mri-series
#18
Esra Abaci Turk, Jie Luo, Borjan Gagoski, Javier Pascau, Carolina Bibbo, Julian N Robinson, P Ellen Grant, Elfar Adalsteinsson, Polina Golland, Norberto Malpica
PURPOSE: To present a method for spatiotemporal alignment of in-utero magnetic resonance imaging (MRI) time series acquired during maternal hyperoxia for enabling improved quantitative tracking of blood oxygen level-dependent (BOLD) signal changes that characterize oxygen transport through the placenta to fetal organs. MATERIALS AND METHODS: The proposed pipeline for spatiotemporal alignment of images acquired with a single-shot gradient echo echo-planar imaging includes 1) signal nonuniformity correction, 2) intravolume motion correction based on nonrigid registration, 3) correction of motion and nonrigid deformations across volumes, and 4) detection of the outlier volumes to be discarded from subsequent analysis...
August 2017: Journal of Magnetic Resonance Imaging: JMRI
https://www.readbyqxmd.com/read/27799276/complex-trajectories-of-brain-development-in-the-healthy-human-fetus
#19
Nickie N Andescavage, Adre du Plessis, Robert McCarter, Ahmed Serag, Iordanis Evangelou, Gilbert Vezina, Richard Robertson, Catherine Limperopoulos
This study characterizes global and hemispheric brain growth in healthy human fetuses during the second half of pregnancy using three-dimensional MRI techniques. We studied 166 healthy fetuses that underwent MRI between 18 and 39 completed weeks gestation. We created three-dimensional high-resolution reconstructions of the brain and calculated volumes for left and right cortical gray matter (CGM), fetal white matter (FWM), deep subcortical structures (DSS), and the cerebellum. We calculated the rate of growth for each tissue class according to gestational age and described patterns of hemispheric growth...
November 1, 2017: Cerebral Cortex
https://www.readbyqxmd.com/read/27749392/combined-ultrasound-and-exome-sequencing-approach-recognizes-opitz-g-bbb-syndrome-in-two-malformed-fetuses
#20
Anna Maria Pinto, Valentina Imperatore, Laura Bianciardi, Margherita Baldassarri, Paolo Galluzzi, Simone Furini, Giovanni Centini, Alessandra Renieri, Francesca Mari
Orofacial clefts are the most common congenital craniofacial anomalies and can occur as an isolated defect or be associated with other anomalies such as posterior fossa anomalies as a part of several genetic syndromes. We report two consecutive voluntary pregnancy interruptions in a nonconsanguineous couple following the fetal ultrasound finding of cleft lip and palate and posterior fossa anomalies confirmed by means of post-termination examination on the second fetus. The quantitative fluorescent PCR, the karyotype, and the comparative genomic hybridization-array analysis after amniocentesis were normal...
January 2017: Clinical Dysmorphology
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