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https://www.readbyqxmd.com/read/29230859/placenta-microstructure-and-microcirculation-imaging-with-diffusion-mri
#1
Paddy J Slator, Jana Hutter, Laura McCabe, Ana Dos Santos Gomes, Anthony N Price, Eleftheria Panagiotaki, Mary A Rutherford, Joseph V Hajnal, Daniel C Alexander
PURPOSE: To assess which microstructural models best explain the diffusion-weighted MRI signal in the human placenta. METHODS: The placentas of nine healthy pregnant subjects were scanned with a multishell, multidirectional diffusion protocol at 3T. A range of multicompartment biophysical models were fit to the data, and ranked using the Bayesian information criterion. RESULTS: Anisotropic extensions to the intravoxel incoherent motion model, which consider the effect of coherent orientation in both microvascular structure and tissue microstructure, consistently had the lowest Bayesian information criterion values...
December 11, 2017: Magnetic Resonance in Medicine: Official Journal of the Society of Magnetic Resonance in Medicine
https://www.readbyqxmd.com/read/29221334/minimally-invasive-multi-disciplinary-approach-for-surgical-management-of-a-mediastinal-congenital-bronchogenic-cyst-in-a-6-month-old-infant
#2
Xiao-Hua Li, Tao Zhang, Sheng Wang, Biao-Chuan He, Xue-Ning Yang, Wen-Zhao Zhong, Ji-Mei Chen
We present a case of prenatal diagnosis of a mediastinal cyst by ultrasound, confirmed during infancy through computed tomography (CT) and magnetic resonance imaging (MRI). A 6-month-old male infant was admitted to the hospital. A mid-mediastinal cyst was detected through a province-wide fetal ultrasonography screening program. During the infancy stage, the CT scan and the MRI confirmed the finding of a mediastinal cyst. Based on the findings on prenatal ultrasonography and postnatal imaging studies (CT, MRI), a benign mediastinal cyst was suspected...
September 2017: Journal of Thoracic Disease
https://www.readbyqxmd.com/read/29191741/thrombolytic-therapy-of-acute-ischemic-stroke-during-early-pregnancy
#3
Anne Landais, Hugo Chaumont, Rachel Dellis
Thrombolytic treatment (recombinant tissue plasminogen activator [rt-PA]) has established efficacy in acute ischemic stroke, but pregnancy has been an exclusion criterion for all clinical trials that validated alteplase in acute stroke, so our knowledge about its use in this condition is limited. Herein we report the successful use of intravenous rt-PA thrombolysis, uncomplicated by neither hemorrhage development nor other complication in a woman who was 13 weeks pregnant with acute ischemic stroke. The brain magnetic resonance imaging diffusion-weighted sequences showed increased signal in the territory of the left middle cerebral artery...
November 28, 2017: Journal of Stroke and Cerebrovascular Diseases: the Official Journal of National Stroke Association
https://www.readbyqxmd.com/read/29186007/anatomically-realistic-ultrasound-phantoms-using-gel-wax-with-3d-printed-moulds
#4
Efthymios Maneas, Wenfeng Xia, Daniil I Nikitichev, Batol Daher, Maniragav Manimaran, Rui Yen J Wong, Chia-Wei Chang, Benyamin Rahmani, Claudio Capelli, Silvia Schievano, Gaetano Burriesci, Sebastien Ourselin, Anna L David, Malcolm Finlay, Simeon J West, Tom Vercauteren, Adrien E Desjardins
Here we describe methods for creating tissue-mimicking ultrasound phantoms based on patient anatomy using a soft material called gel wax. To recreate acoustically realistic tissue properties, two additives to gel wax were considered: paraffin wax to increase acoustic attenuation, and solid glass spheres to increase backscattering. The frequency dependence of ultrasound attenuation was well described with a power law over the measured range of 3 to 10 MHz. With the addition of paraffin wax in concentrations of 0 to 8 w/w%, attenuation varied from 0...
November 29, 2017: Physics in Medicine and Biology
https://www.readbyqxmd.com/read/29184973/variability-of-t1-weighted-signal-intensity-of-pericallosal-lipomas-in-the-fetus
#5
Lydia Chougar, Eléonore Blondiaux, Marie-Laure Moutard, Antoinette Gelot, Jean-Marie Jouannic, Hubert Ducou Le Pointe, Catherine Garel
BACKGROUND: Pericallosal lipomas are often associated with corpus callosum dysgenesis. The diagnosis of lipoma, suggested on ultrasonography, relies on the classic T1 hyperintensity on magnetic resonance imaging (MRI). However, this feature may be absent prenatally. OBJECTIVE: Our objective was to study the changes of T1 intensity in fetal lipomas with comparison to postnatal/postmortem data and to assess the factors influencing the signal variations of pericallosal lipomas on prenatal MRI...
November 28, 2017: Pediatric Radiology
https://www.readbyqxmd.com/read/29181500/perinatal-diagnosis-management-and-follow-up-of-cystic-renal-diseases-a-clinical-practice-recommendation-with-systematic-literature-reviews
#6
Charlotte Gimpel, Fred E Avni, Carsten Bergmann, Metin Cetiner, Sandra Habbig, Dieter Haffner, Jens König, Martin Konrad, Max C Liebau, Lars Pape, Georg Rellensmann, Andrea Titieni, Constantin von Kaisenberg, Stefanie Weber, Paul J D Winyard, Franz Schaefer
Importance: Prenatal and neonatal cystic kidney diseases are a group of rare disorders manifesting as single, multiple unilateral, or bilateral cysts or with increased echogenicity of the renal cortex without macroscopic cysts. They may be accompanied by grossly enlarged kidneys, renal oligohydramnios, pulmonary hypoplasia, extrarenal abnormalities, and neonatal kidney failure. The prognosis is extremely variable from trivial to very severe or even uniformly fatal, which poses significant challenges to prenatal counseling and management...
November 27, 2017: JAMA Pediatrics
https://www.readbyqxmd.com/read/29170468/non-invasive-placental-perfusion-imaging-in-pregnancies-complicated-by-fetal-heart-disease-using-velocity-selective-arterial-spin-labeled-mri
#7
Zungho Zun, Greg Zaharchuk, Nickie N Andescavage, Mary T Donofrio, Catherine Limperopoulos
The placenta is a vital organ for fetal growth and development during pregnancy. Congenital heart disease (CHD) is a leading cause of morbidity and mortality in newborns. Despite the parallel development of the placenta and fetal heart early in pregnancy, very few studies suggested an association between placental dysfunction and fetal CHD. In this study, we report placental perfusion of healthy pregnancies and pregnancies complicated by fetal CHD measured using advanced fetal MRI techniques. We studied forty-eight pregnant women (31 healthy volunteers and 17 with fetal CHD) that underwent fetal MRI during their second or third trimester of pregnancy...
November 23, 2017: Scientific Reports
https://www.readbyqxmd.com/read/29167058/neuroimaging-findings-in-normocephalic-newborns-with-intrauterine-zika-virus-exposure
#8
Sarah B Mulkey, Gilbert Vezina, Dorothy I Bulas, Zarir Khademian, Anna Blask, Youssef Kousa, Caitlin Cristante, Lindsay Pesacreta, Adre J du Plessis, Roberta L DeBiasi
BACKGROUND: Congenital Zika infection can result in a spectrum of neurological abnormalities in the newborn. Newborns exposed to Zika virus in utero often have neuroimaging as part of their clinical evaluation. METHODS: Through the Congenital Zika Program at Children's National Health System in Washington DC, we performed fetal or neonatal neuroimaging, including magnetic resonance imaging and ultrasound, on over 70 fetuses or neonates with intrauterine Zika exposure...
October 19, 2017: Pediatric Neurology
https://www.readbyqxmd.com/read/29166461/presumed-zika-virus-related-congenital-brain-malformations-the-spectrum-of-ct-and-mri-findings-in-fetuses-and-newborns
#9
José Daniel Vieira de Castro, Licia Pacheco Pereira, Daniel Aguiar Dias, Lindenberg Barbosa Aguiar, Joanira Costa Nogueira Maia, Jesus Irajacy Fernandes da Costa, Eveline Campos Monteiro de Castro, Francisco Edson de Lucena Feitosa, Francisco Herlânio Costa Carvalho
OBJECTIVE: The new epidemic of Zika virus infection raises grave concerns, especially with the increasingly-recognized link between emerging cases of microcephaly and this infectious disease. Besides small cranial dimensions, there are striking morphologic anomalies in the fetal brain. Key anomalies include cortical developmental malformations and a peculiar distribution of pathologic calcifications. These potentially indicate a new pattern of congenital central nervous system infection...
October 2017: Arquivos de Neuro-psiquiatria
https://www.readbyqxmd.com/read/29164364/highlights-on-mri-of-the-fetal-body
#10
REVIEW
Lucia Manganaro, Amanda Antonelli, Silvia Bernardo, Federica Capozza, Roberta Petrillo, Serena Satta, Valeria Vinci, Matteo Saldari, Francesca Maccioni, Laura Ballesio, Carlo Catalano
Fetal MRI is a level III diagnostic tool performed subsequently a level II prenatal ultrasound (US), in cases of inconclusive ultrasonographic diagnosis or when a further investigation is required to confirm or improve the diagnosis, to plan an appropriate pregnancy management. Fetal MRI plays an increasingly important role in the prenatal diagnosis of fetal neck, chest and abdominal malformations, even if its role has been amply demonstrated, especially, in the field of fetal CNS anomalies. Due to its multiparametricity and multiplanarity, MRI provides a detailed evaluation of the whole fetal respiratory, gastrointestinal and genitourinary systems, especially on T2-weighted (W) images, with a good tissue contrast resolution...
November 21, 2017: La Radiologia Medica
https://www.readbyqxmd.com/read/29163000/convergence-of-cortical-thalamocortical-and-callosal-pathways-during-human-fetal-development-revealed-by-diffusion-mri-tractography
#11
Rongpin Wang, Molly Wilkinson, Tara Kane, Emi Takahashi
There has been evidence that during brain development, emerging thalamocortical (TC) and corticothalamic (CT) pathways converge in some brain regions and follow each other's trajectories to their final destinations. Corpus callosal (CC) pathways also emerge at a similar developmental stage, and are known to converge with TC pathways in specific cortical regions in mature brains. Given the functional relationships between TC and CC pathways, anatomical convergence of the two pathways are likely important for their functional integration...
2017: Frontiers in Neuroscience
https://www.readbyqxmd.com/read/29153695/posterior-encephalopathy-syndrome-in-women-with-eclampsia-predictors-and-outcome
#12
Anand Kumar Verma, Ravindra Kumar Garg, Yashodhara Pradeep, Hardeep Singh Malhotra, Imran Rizvi, Neeraj Kumar, Neera Kohli, Shweta Pandey
BACKGROUND: This study aims to study predictors of posterior encephalopathy syndrome in eclampsia and the impact of posterior encephalopathy syndrome on outcome. MATERIAL AND METHODS: This prospective study enrolled consecutive women with eclampsia. These women were subjected to magnetic resonance imaging of the brain. Predictors of posterior encephalopathy syndrome were determined using univariate, followed by multivariate, analysis. Women were followed for 30days...
October 2017: Pregnancy Hypertension
https://www.readbyqxmd.com/read/29153658/neurological-function-in-children-born-to-preeclamptic-and-hypertensive-mothers-a-systematic-review
#13
REVIEW
Ernesto A Figueiró-Filho, Lauren E Mak, James N Reynolds, Patrick W Stroman, Graeme N Smith, Nils D Forkert, Angelina Paolozza, Matthew T Rätsep, B Anne Croy
BACKGROUND: Offspring whose mothers developed preeclampsia (PE-F1s) show developmental effects that are now being identified, such as cognitive, behavioural, and mood differences compared to offspring from non-complicated pregnancies. We hypothesize that the progressive angiokine dysregulation associated with development of preeclampsia (PE) reflects gene dysregulation in pre-implantation conceptuses, and manifests in all developing fetal tissues rather than exclusively to the placenta...
October 2017: Pregnancy Hypertension
https://www.readbyqxmd.com/read/29141840/cerebral-oxygenation-measurements-by-magnetic-resonance-imaging-in-fetuses-with-and-without-heart-defects
#14
Mette H Lauridsen, Niels Uldbjerg, Tine B Henriksen, Olav B Petersen, Brian Stausbøl-Grøn, Niels B Matthiesen, David A Peters, Steffen Ringgaard, Vibeke E Hjortdal
BACKGROUND: Children with major congenital heart defects are risking impaired cerebral growth, delayed cerebral maturation, and neurodevelopmental disorders. We aimed to compare the cerebral tissue oxygenation of fetuses with major heart defects to that of fetuses without heart defects as estimated by the magnetic resonance imaging modality T2*. T2* is low in areas with high concentrations of deoxyhemoglobin. METHODS AND RESULTS: At gestational age mean 32 weeks (early) and mean 37 weeks (late), we compared the fetal cerebral T2* in 28 fetuses without heart defects to that of 15 fetuses with major heart defects: transposition of the great arteries (n=7), coarctation of the aorta/hypoplastic aortic arch (n=5), tetralogy of Fallot (n=1), hypoplastic right heart (n=1), and common arterial trunk (n=1)...
November 2017: Circulation. Cardiovascular Imaging
https://www.readbyqxmd.com/read/29138508/fetal-cardiac-cine-magnetic-resonance-imaging-in-utero
#15
Jerome Chaptinel, Jerome Yerly, Yvan Mivelaz, Milan Prsa, Leonor Alamo, Yvan Vial, Gregoire Berchier, Chantal Rohner, François Gudinchet, Matthias Stuber
Fast magnetic resonance imaging (MRI) led to the emergence of 'cine MRI' techniques, which enable the visualization of the beating heart and the assessment of cardiac morphology and dynamics. However, established cine MRI methods are not suitable for fetal heart imaging in utero, where anatomical structures are considerably smaller and recording an electrocardiogram signal for synchronizing MRI data acquisition is difficult. Here we present a framework to overcome these challenges. We use methods for image acquisition and reconstruction that robustly produce images with sufficient spatial and temporal resolution to detect the heart contractions of the fetus, enabling a retrospective gating of the images and thus the generation of images of the beating heart...
November 14, 2017: Scientific Reports
https://www.readbyqxmd.com/read/29135072/measuring-human-placental-blood-flow-with-multidelay-3d-grase-pseudocontinuous-arterial-spin-labeling-at-3t
#16
Xingfeng Shao, Dapeng Liu, Thomas Martin, Teresa Chanlaw, Sherin U Devaskar, Carla Janzen, Aisling M Murphy, Daniel Margolis, Kyunghyun Sung, Danny J J Wang
BACKGROUND: Placenta influences the health of both a woman and her fetus during pregnancy. Maternal blood supply to placenta can be measured noninvasively using arterial spin labeling (ASL). PURPOSE: To present a multidelay pseudocontinuous arterial spin labeling (pCASL) combined with a fast 3D inner-volume gradient- and spin-echo (GRASE) imaging technique to simultaneously measure placental blood flow (PBF) and arterial transit time (ATT), and to study PBF and ATT evolution with gestational age during the second trimester...
November 14, 2017: Journal of Magnetic Resonance Imaging: JMRI
https://www.readbyqxmd.com/read/29125932/pathogenesis-of-cleft-palate-in-robin-sequence-observations-from-prenatal-magnetic-resonance-imaging
#17
Cory M Resnick, Judy A Estroff, Tessa D Kooiman, Carly E Calabrese, Maarten J Koudstaal, Bonnie L Padwa
PURPOSE: The etiology of the palatal cleft in Robin sequence (RS) is unknown. The purpose of this study was to assess the position of the fetal tongue at prenatal magnetic resonance imaging (MRI) and to suggest a potential relation between tongue position and development of the cleft palate seen in most patients with RS. MATERIALS AND METHODS: This is a retrospective case-and-control study including fetuses with prenatal MRIs performed in the authors' center from 2002 to 2017...
October 16, 2017: Journal of Oral and Maxillofacial Surgery
https://www.readbyqxmd.com/read/29119613/mri-and-us-in-the-evaluation-of-fetal-anomalies-the-need-to-work-together
#18
S Bernardo, A Giancotti, A Antonelli, G Rizzo, V Vinci, A Pizzuti, C Catalano, L Manganaro
PURPOSE: Real-time Virtual Sonography (RVS) is a new technique that synchronizes real-time ultrasonography (US) and multiplanar reconstructed Magnetic Resonance images (MRI). The purpose of this study was to evaluate the feasibility and ability of RVS to assess the main pathologies in fetuses with suspected US anomalies. METHOD AND MATERIALS: RVS (Hitachi, HI VISION Ascendus) was offered to 30 patients who had undergone Fetal MRI. The acquired MRI image dataset was loaded into the fusion system and displayed together with the real-time US image...
November 9, 2017: Prenatal Diagnosis
https://www.readbyqxmd.com/read/29119569/the-utility-of-fetal-neurosonography-and-brain-mri-in-cases-of-cytomegalovirus-infection-during-pregnancy-a-retrospective-analysis-with-outcome-correlation
#19
Roee Birnbaum, Liat Ben-Sira, Tally Lerman-Sagie, Gustavo Malinger
OBJECTIVE: To analyze ultrasound and MRI results and developmental outcome in cases of maternal primary CMV infection during pregnancy. METHODS: We retrospectively reviewed the results of fetal neurosonography and brain MRI of CMV infected fetuses (Group 1). Cases of maternal infection in which the fetal status was unknown, and subsequently had a negative CMV postnatal urine analysis, were independently analyzed (Group 2). Imaging results were classified as: positive, negative or inconclusive...
November 8, 2017: Prenatal Diagnosis
https://www.readbyqxmd.com/read/29115686/inner-volume-echo-volumar-imaging-ivevi-for-robust-fetal-brain-imaging
#20
Rita G Nunes, Giulio Ferrazzi, Anthony N Price, Jana Hutter, Andreia S Gaspar, Mary A Rutherford, Joseph V Hajnal
PURPOSE: Fetal functional MRI studies using conventional 2-dimensional single-shot echo-planar imaging sequences may require discarding a large data fraction as a result of fetal and maternal motion. Increasing the temporal resolution using echo volumar imaging (EVI) could provide an effective alternative strategy. Echo volumar imaging was combined with inner volume (IV) imaging (IVEVI) to locally excite the fetal brain and acquire full 3-dimensional images, fast enough to freeze most fetal head motion...
November 8, 2017: Magnetic Resonance in Medicine: Official Journal of the Society of Magnetic Resonance in Medicine
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