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Quantitative characterizations of ultrashort echo (UTE) images for supporting air–bone separation in the head
2015
Physics in Medicine and Biology
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The two MRI sequences tested were ultra-short TE imaging using 3D radial acquisition (UTE), and using pointwise encoding time reduction with radial acquisition (PETRA). ...
Receiver operating characteristic (ROC) analyses, by comparing predicted (defined by MR images) versus "true" regions of air and bone (defined by CT images), were performed with and without residual bias ...
This work was supported by NIH EB016079 and a grant from Siemens Medical Systems. ...
doi:10.1088/0031-9155/60/7/2869
pmid:25776205
pmcid:PMC4405190
fatcat:orybv4aapvgdphh5afmtiu4ypa
MRI-Only Based Radiotherapy Treatment Planning for the Rat Brain on a Small Animal Radiation Research Platform (SARRP)
2015
PLoS ONE
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The MR sequences were: T1-weighted, T2-weighted, zero-echo time (ZTE), and two ultra-short echo time sequences with 20 μs (UTE1) and 2 ms (UTE2) echo times. ...
Six rat heads were imaged, each with one CT and five MR sequences. ...
In addition to these structural images, three other MR sequences were acquired, including an ultra-short echo time sequence with 20μs echo time (UTE1), an ultra-short echo time sequence with 2ms echo time ...
doi:10.1371/journal.pone.0143821
pmid:26633302
pmcid:PMC4669183
fatcat:rw6usyb2qfexdinsh6gkq7pb3e
Advances in MRI of the myelin bilayer
2020
NeuroImage
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In the present work, capture and encoding of the ultra-short-T2 signals in the myelin bilayer is considerably improved by employing advanced short-T2 methodology and hardware, in particular a high-performance ...
However, MRI of the lipid bilayer constituting the myelin membrane is hampered by extremely rapid signal decay and cannot be accomplished with conventional sequences. ...
In the short-T 2 * -enhanced subtraction image (Fig. 9c) , prominent signal is observed from the skull, the skin, and the ear muffs. ...
doi:10.1016/j.neuroimage.2020.116888
pmid:32360688
fatcat:ohgizzrzrjgsxgohtp4mfg2xmy
Investigation of a method for generating synthetic CT models from MRI scans of the head and neck for radiation therapy
2013
Physics in Medicine and Biology
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The method consists of (1) acquiring multiple MRI volumes: T1-weighted, T2-weighted, two echoes from a ultra-short TE (UTE) sequence, and calculated fat and water image volumes using a Dixon method, (2 ...
For one prospective patient, the correlation of skull intensities between CT and MR was investigated, the discriminatory power of MRI in separating air from bone was evaluated, and the generated MRCT image ...
Acknowledgments We wish to thank Siemens Medical Systems for providing a prototype UTE sequence for this investigation. This work was supported in part by NIH EB016079. ...
doi:10.1088/0031-9155/58/23/8419
pmid:24217183
pmcid:PMC3886820
fatcat:7j5g2lxlzfd47irjgp44ljcaqu
Learning-based single-step quantitative susceptibility mapping reconstruction without brain extraction
2019
NeuroImage
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To address these challenges, we propose a learning-based QSM reconstruction method that directly estimates the magnetic susceptibility from total phase images without the need for brain extraction and ...
The neural network has a modified U-net structure and is trained using QSM maps computed by a two-step QSM method. 209 healthy subjects with ages ranging from 11 to 82 years were employed for patch-wise ...
Acknowledgements This study is supported in part by the National Institutes of Health through grants NIMH R01MH096979 and U01EB025162. We thank Woojin Jung and Prof. ...
doi:10.1016/j.neuroimage.2019.116064
pmid:31377323
pmcid:PMC6819263
fatcat:tayob7wnlzgbpbi7ozur4kt5xy
Pseudo-CT Generation for External Radiotherapy Planning from Magnetic Resonance Imaging Data on Brain Regions
2019
Iranian Journal of Radiology
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Conclusion: The proposed method generated pseudo-CT images from different segmented parts of the brain of MRI series. The application requires segmentation of the cortical bones in MR images. ...
Materials and Methods: The pseudo-CT images were generated for 10 randomly chosen patients with brain disease. ...
Funding/Support: This study was funded and supported by Shahid Beheshti University of Medical Sciences (SBMU). ...
doi:10.5812/iranjradiol.82804
fatcat:bm7tgb7tpbd37k4odm7kyeywv4
Silent Zero TE MR Neuroimaging: Current State-of-the-Art and Future Directions
2021
Progress in nuclear magnetic resonance spectroscopy
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a nominal echo time of TE = 0 (thus capturing short-lived signals from MR tissues which are otherwise MR-invisible), 3D radial sampling (providing motion robustness), and ultra-short repetition times ...
Magnetic Resonance Imaging (MRI) scanners produce loud acoustic noise originating from vibrational Lorentz forces induced by rapidly changing currents in the magnetic field gradient coils. ...
We want to acknowledge that the spin coherence diagrams in Figs. 5 and 6 were inspired by Fig. 1 in Ref. [70] . ...
doi:10.1016/j.pnmrs.2021.03.002
pmid:34078538
fatcat:mh3sp3fbdrdlllj6lzi5tcwiaq
Fast frequency-sweep spectroscopic imaging with an ultra-low flip angle
2016
Scientific Reports
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PCSI uses a balanced steady-state free precession (bSSFP) sequence with an ultra-low flip angle to achieve very high acquisition efficiency with a short repetition time. ...
The lipid signal in the skull has to be suppressed to prevent it from contaminating the spectra obtained inside the brain. ...
Acknowledgements This work was supported in part by Cancer Center Support Grant P30 CA-21765 from the National Cancer Institute at the National institutes of Health, Bethesda, MD, and by ALSAC, Memphis ...
doi:10.1038/srep30066
pmid:27440077
pmcid:PMC4954958
fatcat:j3ircbj6t5glvdqhpypfnnmwsm
Region specific optimization of continuous linear attenuation coefficients based on UTE (RESOLUTE): application to PET/MR brain imaging
2015
Physics in Medicine and Biology
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Acknowledgments The PET/MR system was donated by the John and Birthe Meyer Foundation. We thank Dr Gillings for linguistic corrections. ...
The ultra-short echo time (UTE) MR sequence (Robson et al 2003) was proposed for MR-AC to account for the bias introduced by ignoring the bone (Catana et al 2010) . ...
The UTE sequence consists of a pair of MR images obtained at an ultra-short echo time, where a signal can be obtained in bone, and a later echo time, where the bone signal has fully decayed. ...
doi:10.1088/0031-9155/60/20/8047
pmid:26422177
fatcat:beg4522xirb2zismpgq2zoerre
Multi-slice passband bSSFP fMRI at ultra-high field
[article]
2018
arXiv
pre-print
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Balanced steady-state free precession (bSSFP) can be used as an alternative to gradient-echo (GE) EPI for BOLD functional MRI when image distortions and signal drop-outs are severe such as at ultra-high ...
However, 3D-bSSFP acquisitions have distinct drawbacks on either human or animal MR systems. ...
They also acknowledge assistance with animal setup and monitoring from Mario Lepore and Stefan Mitrea. ...
arXiv:1812.04395v1
fatcat:4b5vk3f3j5ehno6ncokt4k2xye
A review on methods to estimate a CT from MRI data in the context of MRI-alone RT
2018
Medical Technologies Journal
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Conclusion: Radiation therapy is emerging towards the generalisation of MRI-only RT thanks to the advances in techniques for generation of pseudo-CT images and the development of specialised MR sequences ...
In addition, an interest in the Dixon MR sequence is increasing since it has the advantage of producing multiple contrast images with a single acquisition. ...
In (32) , authors presented a classification approach to generate a pseudo-CT from several MR images such as T1-weighted, T2-weighted, and two echoes from an Ultra-short Echo Time (UTE) sequence. ...
doi:10.26415/2572-004x-vol2iss1p150-178
fatcat:g3sfz6haffevlbrsbwhwqt6hye
Post Mortem Validation of MRI-Identified Veins on the Surface of the Cerebral Cortex as Potential Landmarks for Neurosurgery
2017
Frontiers in Neuroscience
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Imaging data are registered to the patient's skull so that they correspond to the intraoperative macro-and microscopic view. ...
and Objective: Image-guided neurosurgery uses information from a wide spectrum of methods to inform the neurosurgeon's judgement about which tissue to resect and which to spare. ...
ST: Medical contribution, MR imaging. SR: Writing, image processing, MR imaging. ...
doi:10.3389/fnins.2017.00355
pmid:28680389
pmcid:PMC5478689
fatcat:dwfpdfvj2jgc7oy4xbmlof2gmm
Random forest regression for magnetic resonance image synthesis
2017
Medical Image Analysis
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By choosing different pulse sequences and their parameters, magnetic resonance imaging (MRI) can generate a large variety of tissue contrasts. ...
Although image synthesis of MR images has been shown to be helpful in addressing this problem, an inability to synthesize both T 2 -weighted brain images that include the skull and FLuid Attenuated Inversion ...
Acknowledgments This work was supported by the NIH/NIBIB under grant R21 EB012765 and R01 EB017743, and by the NIH/ NINDS through grant R01 NS070906. ...
doi:10.1016/j.media.2016.08.009
pmid:27607469
pmcid:PMC5099106
fatcat:dm4njm3gl5c53p4dl6vpx6vuf4
Contribution of Susceptibility-Weighted Imaging to Acute Stroke Assessment
2004
Stroke
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We report on the use of SW imaging (SWI) sequences in clinical practice and highlight the future applications. ...
Summary of Review-SWI exploits the magnetic susceptibility effects generated by local inhomogeneities of the magnetic field. ...
generated by the paranasal sinuses and the skull base. ...
doi:10.1161/01.str.0000133341.74387.96
pmid:15192245
fatcat:x3ex4tswm5afraelepogbxkdha
Preconditioned total field inversion (TFI) method for quantitative susceptibility mapping
2016
Magnetic Resonance in Medicine
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Moreover, preconditioned TFI was capable of generating QSM for the entire head including the brain, air-filled sinus, skull, and fat. ...
Theory and Methods-The proposed TFI is a single optimization problem which simultaneously estimates the background and local fields, preventing error propagation from background field removal to QSM. ...
Third, for whole head QSM, the skull has very short T2 * , such that the multi-echo GRE sequence fails to acquire skull MR signal for field estimation. ...
doi:10.1002/mrm.26331
pmid:27464893
pmcid:PMC5274595
fatcat:ezyiqwkwgbhyfocwdobbytlymq
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