Optimization and Initial Experience of a Multisection Balanced Steady-State Free Precession Cine Sequence for the Assessment of Fetal Behavior in Utero

Hayat, Tayyib T. A.; Nihat, Akin; Martinez‐Biarge, Miriam; McGuinness, A.; Allsop, Joanna; Hajnal, Joseph V.; Rutherford, Mary A.

doi:10.3174/ajnr.a2295

Cited by 53 publications

(75 citation statements)

References 34 publications

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“…In another study, Kikuchi et al (73) suggested limiting RF exposure to 40 minutes at whole-body SAR value of 2 W/kg and to 10 minutes at whole-body SAR value of 4 W/kg. In addition, Hayat et al (95) suggested limiting SAR to 2 W/kg in SSFP.…”

Section: Other Considerationsmentioning

confidence: 99%

Fetal MRI: A technical update with educational aspirations

Gholipour

Estroff

Barnewolt

et al. 2014

Concepts Magnetic Resonance

100

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Fetal magnetic resonance imaging (MRI) examinations have become well-established procedures at many institutions and can serve as useful adjuncts to ultrasound (US) exams when diagnostic doubts remain after US. Due to fetal motion, however, fetal MRI exams are challenging and require the MR scanner to be used in a somewhat different mode than that employed for more routine clinical studies. Herein we review the techniques most commonly used, and those that are available, for fetal MRI with an emphasis on the physics of the techniques and how to deploy them to improve success rates for fetal MRI exams. By far the most common technique employed is single-shot T2-weighted imaging due to its excellent tissue contrast and relative immunity to fetal motion. Despite the significant challenges involved, however, many of the other techniques commonly employed in conventional neuro- and body MRI such as T1 and T2*-weighted imaging, diffusion and perfusion weighted imaging, as well as spectroscopic methods remain of interest for fetal MR applications. An effort to understand the strengths and limitations of these basic methods within the context of fetal MRI is made in order to optimize their use and facilitate implementation of technical improvements for the further development of fetal MR imaging, both in acquisition and post-processing strategies.

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Section: Other Considerationsmentioning

confidence: 99%

Fetal MRI: A technical update with educational aspirations

Gholipour

Estroff

Barnewolt

et al. 2014

Concepts Magnetic Resonance

100

View full text Add to dashboard Cite

show abstract

“…7 Locating the ROI is successful in 81% of scans, with success being defined as no loss of foetal tissue, and a clear reduction in maternal tissue.…”

Section: Resultsmentioning

confidence: 99%

Machine learning for the automatic localisation of foetal body parts in cine-MRI scans

et al. 2015

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Being able to automate the location of individual foetal body parts has the potential to dramatically reduce the work required to analyse time resolved foetal Magnetic Resonance Imaging (cine-MRI) scans, for example, for use in the automatic evaluation of the foetal development. Currently, manual preprocessing of every scan is required to locate body parts before analysis can be performed, leading to a significant time overhead. With the volume of scans becoming available set to increase as cine-MRI scans become more prevalent in clinical practice, this stage of manual preprocessing is a bottleneck, limiting the data available for further analysis. Any tools which can automate this process will therefore save many hours of research time and increase the rate of new discoveries in what is a key area in understanding early human development. Here we present a series of techniques which can be applied to foetal cine-MRI scans in order to first locate and then differentiate between individual body parts. A novel approach to maternal movement suppression and segmentation using Fourier transforms is put forward as a preprocessing step, allowing for easy extraction of short movements of individual foetal body parts via the clustering of optical flow vector fields. These body part movements are compared to a labelled database and probabilistically classified before being spatially and temporally combined to give a final estimate for the location of each body part.

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“…[16] All these movements are completed at the 15 th gestational week but mothers can feel these movements during 16 th to 18 th weeks. Hayat et al [17] reported that the frequency of the fetal movements was generally much more than the third trimester (36 th week) and if fetus has got decreased central nervous system maturity, fetal movements may hypokinesia or akinesia.…”

Section: Discussionmentioning

confidence: 99%