Uday Krishnamurthy1,2, Brijesh K Yadav1,2, Pavan K Jella1, Ewart Mark Haacke1,2, Edgar Hernandez-Andrade3,4, Swati Mody1, Lami Yeo3,4, Sonia S Hassan3,4, Roberto Romero3,5,6,7, Jaladhar Neelavalli1,2. 1. Department of Radiology, Wayne State University School of Medicine, Detroit, Michigan, USA. 2. Department of Biomedical Engineering, Wayne State University College of Engineering, Detroit, Michigan, USA. 3. Perinatology Research Branch, NICHD/NIH/DHHS, Bethesda, Maryland, and Detroit, Michigan, USA. 4. Department of Obstetrics and Gynecology, Wayne State University School of Medicine, Detroit, Michigan, USA. 5. Department of Obstetrics and Gynecology, University of Michigan, Ann Arbor, Michigan, USA. 6. Department of Epidemiology and Biostatistics, Michigan State University, East Lansing, Michigan, USA. 7. Center for Molecular Medicine and Genetics, Wayne State University, Detroit, Michigan, USA.
Abstract
BACKGROUND: Volumetric assessment of afferent blood flow rate provides a measure of global organ perfusion. Phase-contrast magnetic resonance imaging (PCMRI) is a reliable tool for volumetric flow quantification, but given the challenges with motion and lack of physiologic gating signal, such studies, in vivo on the human placenta, are scant. PURPOSE: To evaluate and apply a nongated (ng) PCMRI technique for quantifying blood flow rates in utero in umbilical vessels. STUDY TYPE: Prospective study design. STUDY POPULATION: Twenty-four pregnant women with median gestational age (GA) 30 4/7 weeks and interquartile range (IQR) 8 1/7 weeks. FIELD STRENGTH/SEQUENCE: All scans were performed on a 3.0T Siemens Verio system using the ng-PCMRI technique. ASSESSMENT: The GA-dependent increase in umbilical vein (UV) and arterial (UA) flow was compared to previously published values. Systematic error to be expected from ng-PCMRI, in the context of pulsatile UA flow and partial voluming, was studied through Monte-Carlo simulations, as a function of resolution and number of averages. STATISTICAL TESTS: Correlation between the UA and UV was evaluated using a generalized linear model. RESULTS: Simulations showed that ng-PCMRI measurement variance reduced by increasing the number of averages. For vessels on the order of 2 voxels in radius, partial voluming led to 10% underestimation in the flow. In fetuses, the average flow rates in UAs and UV were measured to be 203 ± 80 ml/min and 232 ± 92 ml/min and the normalized average flow rates were 140 ± 59 ml/min/kg and 155 ± 57 ml/min/kg, respectively. Excellent correlation was found between the total arterial flow vs. corresponding venous flow, with a slope of 1.08 (P = 0.036). DATA CONCLUSION: Ng-PCMRI can provide accurate volumetric flow measurements in utero in the human umbilical vessels. Care needs to be taken to ensure sufficiently high-resolution data are acquired to minimize partial voluming-related errors. LEVEL OF EVIDENCE: 2 Technical Efficacy Stage 1 J. Magn. Reson. Imaging 2017.
BACKGROUND: Volumetric assessment of afferent blood flow rate provides a measure of global organ perfusion. Phase-contrast magnetic resonance imaging (PCMRI) is a reliable tool for volumetric flow quantification, but given the challenges with motion and lack of physiologic gating signal, such studies, in vivo on the human placenta, are scant. PURPOSE: To evaluate and apply a nongated (ng) PCMRI technique for quantifying blood flow rates in utero in umbilical vessels. STUDY TYPE: Prospective study design. STUDY POPULATION: Twenty-four pregnant women with median gestational age (GA) 30 4/7 weeks and interquartile range (IQR) 8 1/7 weeks. FIELD STRENGTH/SEQUENCE: All scans were performed on a 3.0T Siemens Verio system using the ng-PCMRI technique. ASSESSMENT: The GA-dependent increase in umbilical vein (UV) and arterial (UA) flow was compared to previously published values. Systematic error to be expected from ng-PCMRI, in the context of pulsatile UA flow and partial voluming, was studied through Monte-Carlo simulations, as a function of resolution and number of averages. STATISTICAL TESTS: Correlation between the UA and UV was evaluated using a generalized linear model. RESULTS: Simulations showed that ng-PCMRI measurement variance reduced by increasing the number of averages. For vessels on the order of 2 voxels in radius, partial voluming led to 10% underestimation in the flow. In fetuses, the average flow rates in UAs and UV were measured to be 203 ± 80 ml/min and 232 ± 92 ml/min and the normalized average flow rates were 140 ± 59 ml/min/kg and 155 ± 57 ml/min/kg, respectively. Excellent correlation was found between the total arterial flow vs. corresponding venous flow, with a slope of 1.08 (P = 0.036). DATA CONCLUSION: Ng-PCMRI can provide accurate volumetric flow measurements in utero in the human umbilical vessels. Care needs to be taken to ensure sufficiently high-resolution data are acquired to minimize partial voluming-related errors. LEVEL OF EVIDENCE: 2 Technical Efficacy Stage 1 J. Magn. Reson. Imaging 2017.
Authors: Sharon Portnoy; Mark Osmond; Meng Yuan Zhu; Mike Seed; John G Sled; Christopher K Macgowan Journal: Magn Reson Med Date: 2016-04-05 Impact factor: 4.668
Authors: Wei Feng; David Utriainen; Gabriela Trifan; Saba Elias; Sean Sethi; Joseph Hewett; E Mark Haacke Journal: Neurol Res Date: 2012-10 Impact factor: 2.448
Authors: L Breysem; H Bosmans; S Dymarkowski; D Van Schoubroeck; I Witters; J Deprest; P Demaerel; D Vanbeckevoort; C Vanhole; P Casaer; M Smet Journal: Eur Radiol Date: 2003-04-15 Impact factor: 5.315
Authors: J B De Vis; J Hendrikse; F Groenendaal; L S de Vries; K J Kersbergen; M J N L Benders; E T Petersen Journal: Neuroimage Clin Date: 2014-03-19 Impact factor: 4.881
Authors: Sophie Couper; Alys Clark; John M D Thompson; Dimitra Flouri; Rosalind Aughwane; Anna L David; Andrew Melbourne; Ali Mirjalili; Peter R Stone Journal: J Physiol Date: 2021-01-18 Impact factor: 6.228