Artefacts resonance imaging magnetic. Medical search. Frequent questions

Three-dimensional (3D) imaging techniques, such as magnetic resonance imaging (MRI), computed tomography (CT), and positron emission tomography (PET), are routinely used in medicine to generate high-resolution volume images of the human body. (uu.se)
Three-dimensional (3D) imaging technique such as computed tomography (CT) and magnetic resonance imaging (MRI) are now routinely used in medicine. (uu.se)
In this project, we are looking into how distance transforms and constructive solid geometry can be used to generate 3D printable models of surgical guides and plates from segmented computed tomography (CT) images of a patient, and how the accuracy and precision of the modelling can be improved by using grayscale image information in combination with anti-aliased distance transforms. (uu.se)
Computed Tomography (CT) is an excellent imaging modality in the evaluation of RP masses. (waocp.com)
Computed Tomography (CT) is an excellent cross sectional imaging technique in the evaluation of RP masses. (waocp.com)
The diagnosis of pancreatic cancers, particularly their differential diagnosis from chronic pancreatitis, has often been difficult, even when a combination of various imaging modalities such as ultrasonography (US), magnetic resonance cholangiopancreatography (MRCP), endoscopic retrograde cholangiopancreatography (ERCP), endosonography (EUS), contrast enhanced computed tomography (CT), and catheterised angiography are employed. (bmj.com)
Nonenhanced axial computed tomography image demonstrates a large, round tumor arising within the fourth ventricle with attenuating nodular calcifications. (medscape.com)

Electroencephalogram (EEG) data recorded simultaneously with functional magnetic resonance imaging (fMRI) suffer from severe artefacts. (researchgate.net)
Many neuroimaging studies have demonstrated the potential of functional network connectivity patterns estimated from resting functional magnetic resonance imaging (fMRI) to discriminate groups and predict information about individual subjects. (biorxiv.org)
Functional magnetic resonance image (fMRI) experiments rely on the ability to detect subtle signal changes in magnetic resonance image time series. (ox.ac.uk)
This report reviews some of the several artefacts that are frequently present in fMRI data, degrading their quality and hence their interpretation. (ox.ac.uk)
This data set contains electroencephalography (EEG) data as well as simultaneous EEG with functional magnetic resonance imaging (EEG/fMRI) data. (amsterdamumc.org)
These yielded six extra׳CWL׳ signals related to Faraday induction of these loops in the main magnetic field "Measurement and reduction of motion and ballistocardiogram artefacts from simultaneous EEG and fMRI recordings" (Masterton et al. (amsterdamumc.org)

MRI is a medical application of nuclear magnetic resonance (NMR) which can also be used for imaging in other NMR applications, such as NMR spectroscopy. (wikipedia.org)
MRI was originally called NMRI (nuclear magnetic resonance imaging), but "nuclear" was dropped to avoid negative associations. (wikipedia.org)
MRI is based upon the science of nuclear magnetic resonance (NMR). (alchetron.com)

The relationship between cardiovascular magnetic resonance (CMR)-derived myocardial blood flow (MBF) and reference invasive coronary function tests is uncertain. (bmj.com)
Cardiovascular magnetic resonance (CMR) can through the two methods 3D FLASH and diffusion tensor imaging (DTI) give complementary information on the local orientations of cardiomyocytes and their laminar arrays. (biomedcentral.com)
Transfer learning for classification of cardiovascular tissues in histological images. (dagstuhl.de)
Flow analysis carried out using phase contrast cardiac magnetic resonance imaging (PC-CMR) enables the quantification of important parameters that are used in the assessment of cardiovascular function. (catalyzex.com)
MOCOnet: Robust Motion Correction of Cardiovascular Magnetic Resonance T1 Mapping Using Convolutional Neural Networks. (ox.ac.uk)
Background: Quantitative cardiovascular magnetic resonance (CMR) T1 mapping has shown promise for advanced tissue characterisation in routine clinical practise. (ox.ac.uk)
The Society for Cardiovascular Magnetic Resonance (SCMR) is accredited by the Accreditation Council for Continuing Medical Education (ACCME) to provide continuing medical education for physicians. (peachnewmedia.com)
The Society for Cardiovascular Magnetic Resonance (SCMR) designates this Journal-based CME activity for a maximum of 1.0 AMA PRA Category 1 Credit (s)™ . (peachnewmedia.com)

Due to the sensitivity of the magnetic resonance imaging (MRI) data acquisition process, slight changes around the scanner system can produce artefacts in the images. (springer.com)

Diffusion MRI and functional MRI extend the utility of MRI to capture neuronal tracts and blood flow respectively in the nervous system, in addition to detailed spatial images. (wikipedia.org)
Here we propose a novel, highly resolved connectivity mapping approach, using ultrafast functional ultrasound (fUS), which enables imaging of cerebral microvascular haemodynamics deep in the anaesthetized rodent brain, through a large thinned-skull cranial window, with pixel dimensions of 100 μm × 100 μm in-plane. (nature.com)
These results introduce fUS as a powerful novel neuroimaging method, which could be extended to portable systems for three-dimensional functional connectivity imaging in awake and freely moving rodents. (nature.com)
In the present study, we integrated Magnetic Resonance (MR) and X-ray imaging techniques to evaluate the non-rigid behavior of the lower-limb soft tissue of healthy adults for a number of different functional tasks. (asme.org)
Application of functional imaging techniques to animal models is vital to understand pain mechanisms, but is often confounded by the need to limit movement artefacts with anaesthesia, and a focus on evoked responses rather than clinically relevant sp. (worktribe.com)

Compared to CT, MRI provides better contrast in images of soft tissues, e.g. in the brain or abdomen. (wikipedia.org)
The electrodes are shown to be the dominant source of magnetic field inhomogeneity, although the localised nature of the field perturbation that they produce means that the effect on the signal intensity from the brain is not significant. (researchgate.net)
Two different datasets were collected, one consisting of brain scans while the other pelvic scans, which were used to train separate models, implementing their corresponding artefact augmentations. (springer.com)
We trained two models for multi-task MRI artefact correction of brain, and pelvic scans. (springer.com)
To date, only rsfMRI has been able to image intrinsic brain networks with the appropriate spatial resolution and coverage. (nature.com)
Study the ghostly skeletal artefacts that include fragile sewing patterns, magnetic resonance imaging, and cross-sections of brain. (printmakers.mb.ca)
Due to the enormous amount of information in a typical MR brain volume scan, and difficulties such as partial volume effects, noise, artefacts, etc., interactive tools for computer aided analysis are absolutely essential for this task. (uu.se)
Calcium imaging is a versatile experimental approach capable of resolving single neurons with single-cell spatial resolution in the brain. (nature.com)
Before the development of cross-sectional and multiplanar imaging, angiography and pneumoencephalography were used to localize brain masses and characterize tumor vascularity. (medscape.com)
Manganese-enhanced magnetic resonance imaging depicts brain activity in models of acute and chronic pain: a new window to study experimental spontaneous pain? (worktribe.com)
A four-dimensional computational model of dynamic contrast-enhanced magnetic resonance imaging measurement of subtle blood-brain barrier leakage. (dagstuhl.de)
Generating Longitudinal Atrophy Evaluation Datasets on Brain Magnetic Resonance Images Using Convolutional Neural Networks and Segmentation Priors. (dagstuhl.de)
Selective Motion Artefact Reduction via Radiomics and k-space Reconstruction for Improving Perivascular Space Quantification in Brain Magnetic Resonance Imaging. (dagstuhl.de)
Deep learning for atrophy quantification in brain magnetic resonance imaging. (dagstuhl.de)
A Framework for Jointly Assessing and Reducing Imaging Artefacts Automatically Using Texture Analysis and Total Variation Optimisation for Improving Perivascular Spaces Quantification in Brain Magnetic Resonance Imaging. (dagstuhl.de)
Quantitative Analysis of Patch-Based Fully Convolutional Neural Networks for Tissue Segmentation on Brain Magnetic Resonance Imaging. (dagstuhl.de)
Deep convolutional neural networks for brain image analysis on magnetic resonance imaging: a review. (dagstuhl.de)
Analysis of Spatial Spectral Features of Dynamic Contrast-Enhanced Brain Magnetic Resonance Images for Studying Small Vessel Disease. (dagstuhl.de)
Parametric Assessment of the Effect of Cochlear Implant Positioning on Brain MRI Artefacts at 3 T. Otol Neurotol. (ccevent.site)

Technical imaging advancements allow detection and quantification of very small tissue volumes in magnetic resonance (MR) neuroimaging. (uu.se)
An essential part of this analysis is the identification of the correct CMR views and quality control (QC) to detect artefacts that could affect the flow quantification. (catalyzex.com)
Using a mixture of internal and external analysis software, analysts are responsible for the interpretation and quantification of customer data, handling acquisition quality issues (artefacts), and delivering accurate and robust reports for both clinical and investigational use. (perspectum.com)

This multicentre study assessed the intra- and interreader reproducibility of quantitative tophus volume measurements from magnetic resonance images (MRI) in subjects with palpable gouty tophi. (nih.gov)
In addition to qualitative analysis performed by radiologists, digital image analysis can be used to extract quantitative information about the patient based on the image data. (uu.se)
The ability to quickly and accurately extract quantitative information from medical images has a huge potential in clinical research and, ultimately, in everyday clinical radiological practice. (uu.se)
The diffusive mobility of water is a sensitive indicator of tissue energy status, and perfusion imaging provides quantitative measurements of cerebral blood flow (CBF). (ucl.ac.uk)
High time-resolution sequences for rapid, quantitative diffusion imaging were implemented on both high-field and low-field MRI systems. (ucl.ac.uk)
Patients will undergo multiparametric CMR and have assessments of MBF (using a novel pixel-wise fully quantitative method), left ventricular function and mass, and tissue characterisation (T1 mapping and late gadolinium enhancement imaging). (bmj.com)
You will be charged with quantitative analysis of magnetic resonance images (MRI) as part of Perspectum's clinical reporting service. (perspectum.com)
With a strong focus on precision medicine using advanced imaging and genetics, our vision is to empower patients and clinicians through quantitative assessments of health enabling early detection, diagnosis, and targeted treatment. (perspectum.com)

The ballistocardiogram (BCG) artefact in particular is as yet poorly understood and different BCG removal strategies have been proposed. (researchgate.net)

abstract = "It was recently reported that cutting artefacts occur in some species when branches under tension are cut, even under water. (elsevierpure.com)

In this paper, we combine a network-based method with image registration to develop a shape-based bi-ventricular segmentation tool for short-axis cardiac magnetic resonance (CMR) volumetric images. (birmingham.ac.uk)
The purpose of this study is to introduce a visualization and interaction tool of Augmented Reality in mobile devices using three-dimensional (3D) volumetric images from patients' real tomographic acquisition, and to describe the steps for preparing the models for such 3D visualizations. (bvsalud.org)

Metal microelectrode arrays commonly used for recording neural activity cannot be used for such purposes, as they block the field of view, generate optical shadows and are prone to producing light-induced artefacts in the recordings. (nature.com)
High Bandwidth Inversion Recovery Cardiac inversion recovery for patients prone to susceptibility artefacts. (siemens-healthineers.com)
However, T1 mapping is prone to motion artefacts, which affects its robustness and clinical interpretation. (ox.ac.uk)

After randomisation in CorMicA, subjects will be invited to participate in the Coronary Microvascular Angina Cardiac Magnetic Resonance Imaging (CorCMR) substudy. (bmj.com)
The accuracy of Electrocardiogram (ECG) gating for synchronization of MR scanner image acquisition and cardiac electrical activity is of great importance for acquiring high-quality Cardiac Magnetic Resonance (CMR) images free of motion artefacts. (biomedcentral.com)

While MRI is most prominently used in diagnostic medicine and biomedical research, it also may be used to form images of non-living objects, such as mummies. (wikipedia.org)
We present a grading protocol to quantitatively assess the severity of these artefacts and offer an option to minimise the impact of SPIO nanoparticles on diagnostic imaging. (ox.ac.uk)
Two radiologists with over 10-year experience in breast imaging assessed the images and analysed the void artefacts and their impact on diagnostic follow-up. (ox.ac.uk)
Plastic (polyoxymethylene) port systems are very light and they offer the advantage of minimal artefact formation using diagnostic methods such as magnetic resonance imaging. (mederen.com)

Although the focus of attention on data degradation during simultaneous MRI/EEG recording has to date largely been upon EEG artefacts, the presence of the conducting wires and electrodes of the EEG recording system also causes some degradation of MRI data quality. (researchgate.net)
For images with multiple simultaneous artefacts, we show that the performance of using a combination of models, trained to correct individual artefacts depends heavily on the order that they were applied. (springer.com)
Here, we report a transparent, flexible neural electrode technology based on graphene, which enables simultaneous optical imaging and electrophysiological recording. (nature.com)
Simultaneous electrophysiology and optical imaging could leverage the temporal and spatial resolution advantages of both techniques. (nature.com)
Completely transparent microelectrodes can offer a solution for this spatial-temporal resolution dilemma by enabling simultaneous imaging and electrophysiology from the same microcircuit. (nature.com)

Coronary magnetic resonance angiography (CMRA) is a potential safe alternative which could be performed with or without gadolinium contrast agents. (peachnewmedia.com)
This CME activity is designed to enhance the learner understanding of a recently developed, high spatial resolution coronary magnetic resonance angiography sequence, which has been validated in a cohort of patients with low-intermediate risk of coronary artery disease. (peachnewmedia.com)
1. Learners need to know about: Coronary magnetic resonance angiography, coronary artery disease, respiratory motion correction techniques, highly under sampled acquisition and reconstruction techniques. (peachnewmedia.com)
2. Learners need to know how to apply: Coronary artery assessment, coronary magnetic resonance angiography described in this topic. (peachnewmedia.com)
3. Learners need to perform: Further reading around the topic of advanced coronary magnetic resonance angiography. (peachnewmedia.com)

This may result from magnetic susceptibility effects which lead to signal drop-out and image distortion, as well as the perturbation of the radiofrequency fields, which can cause local signal changes and a global reduction in the signal to noise ratio (SNR) of magnetic resonance images. (researchgate.net)
The distortion of ECG traces by Magnetohydrodynamic Voltages (VMHD) induced by interaction between the MRI static magnetic field (B 0 ) and rapid left-ventricular blood ejection during systole can lead to false and/or intermittent QRS complex detection and images with severe motion artefacts [ 1 ]. (biomedcentral.com)
MRI safety, imaging artefacts, and grid distortion evaluated for FFP3 respiratory masks worn throughout the COVID-19 pandemic. (cardiff.ac.uk)

However, due to the presence of image artefacts in the training dataset, the resulting FCN segmentation results are often imperfect. (birmingham.ac.uk)
Using the UK Biobank imaging dataset scanned at 1.5T, MOCOnet was trained on 1,536 mid-ventricular T1 maps (acquired using the ShMOLLI method) with motion artefacts, generated by a customised deformation procedure, and tested on a different set of 200 samples with a diverse range of motion. (ox.ac.uk)

MOCOnet was compared to a well-validated baseline multi-modal image registration method. (ox.ac.uk)
Virtual histology of multi-modal magnetic resonance imaging of cerebral cortex in young men. (cardiff.ac.uk)

Controlling motion artefact levels in MR images by suspending data acquisition during periods of head motion. (mpg.de)
It provides explicit anatomical details, faster data acquisition times, higher spatial resolution, large volume coverage and reduced image artefacts. (waocp.com)

The results indicate that both vessel cavitation and refilling occur in xylem tissue under tension following stem cutting, but its frequency is quite small, and artefacts can be minimized altogether if the distance between the monitoring position and the cutting point is longer than the MVL. (elsevierpure.com)
A Nitinol-based guidewire (Terumo, Tokyo, Japan) was inserted into a vessel phantom and imaged using 1.5-T and 0.2-T MR systems with continuous temperature monitoring at the guidewire tip. (mrisafety.com)
When the first microbubble signal appeared in the pancreas, images of the ideal scanning plane were displayed in a real time continuous fashion (vessel images). (bmj.com)
1- 9 However, there are still inherent limitations for observation of real time vessel image because of artefacts such as blooming or overpainting. (bmj.com)
Examining the Relationship between Semiquantitative Methods Analysing Concentration-Time and Enhancement-Time Curves from Dynamic-Contrast Enhanced Magnetic Resonance Imaging and Cerebrovascular Dysfunction in Small Vessel Disease. (dagstuhl.de)

Its non-invasive nature and the ability to obtain images with a high degree of spatial resolution, have been exploited in this research as well as in routine clinical investigations. (ucl.ac.uk)
MRI scans are capable of producing a variety of chemical and physical data, in addition to detailed spatial images. (alchetron.com)
Despite this, conventional CMRA is limited by low scan efficiency, long and unpredictable acquisition times, low spatial resolution and image quality degradation due to cardiac, respiratory and patient motion artefacts. (peachnewmedia.com)

During the acquisition of MRI data, patient-, sequence-, or hardware-related factors can introduce artefacts that degrade image quality. (springer.com)
Eight explanted rat hearts were perfused with Gd-DTPA contrast agent and fixative and imaged in a 9.4T magnet by two types of acquisition: 3D fast low angle shot (FLASH) imaging, voxels 50 × 50 × 50 μm, and 3D spin echo DTI with monopolar diffusion gradients of 3.6 ms duration at 11.5 ms separation, voxels 200 × 200 × 200 μm. (biomedcentral.com)

MRI scanners use strong magnetic fields, magnetic field gradients, and radio waves to generate images of the organs in the body. (wikipedia.org)
Pulses of radio waves excite the nuclear spin energy transition, and magnetic field gradients localize the polarization in space. (wikipedia.org)
Additionally, we explored a novel loss function that does not only aim to reconstruct the individual pixel values, but also the image gradients, to produce sharper, more realistic results. (springer.com)
Physiological effects of human body imaging with 300 mT/m gradients. (cardiff.ac.uk)

Patients with CNS symptoms routinely undergo cross-sectional imaging. (medscape.com)

10- 15 With the use of a microbubble contrast agent (a suspension of monosaccharide microparticles in sterile water), it depicts signals from microbubbles in very slow flow without Doppler related artefacts, and enables visualisation of slow flow in microscopic vessels. (bmj.com)

Machine learning has achieved outstanding results in improving MR image quality for these tasks individually, yet multi-task methods are rarely explored. (springer.com)
Our proposed model generally outperformed other commonly-used correction methods for individual artefacts, consistently achieving equal or superior results in at least one of the evaluation metrics. (springer.com)
Therefore, the validation of complementary or alternative methods for in vivo imaging of intrinsic FC is an important scientific objective. (nature.com)
In the medical image processing (MedIP) group, we develop interactive methods and methods for large-scale analysis in medical imaging. (uu.se)
At CBA, we have been developing powerful new methods for interactive image segmentation. (uu.se)
In this project, we seek to employ these methods for segmentation of medical images, in collaboration with the Dept.~of Surgical Sciences at the Uppsala University Hospital. (uu.se)
METHODS: Follow-up mammography and MRI of two patient groups after a magnetic SLNB were included in the study. (ox.ac.uk)

Numerical experiments on the two datasets demonstrate that our approach is capable of producing accurate, high-resolution and anatomically smooth bi-ventricular models, despite the artefacts in the input CMR volumes. (birmingham.ac.uk)

Magnetic resonance imaging (MRI) has opened up new avenues of anatomical and physiological research. (ucl.ac.uk)

As of yet, neural recordings with completely transparent, flexible electrode arrays, compatible with in vitro and in vivo imaging techniques, have not been demonstrated, to our knowledge. (nature.com)

Acute ischemic stroke lesion core segmentation in CT perfusion images using fully convolutional neural networks. (dagstuhl.de)
We propose MOCOnet, a convolutional neural network solution, for generalisable motion artefact correction in T1 maps. (ox.ac.uk)

A background in MR or other imaging modalities would be highly beneficial to this role. (perspectum.com)

2020. "The Influence of Motion Artefacts on Magnetic Resonance Imaging of the Clavicles for Age Estimation. (ugent.be)
The influence of motion artefacts on magnetic resonance imaging of the clavicles for age estimation," INTERNATIONAL JOURNAL OF LEGAL MEDICINE , vol. 134, no. 2, pp. 753-768, 2020. (ugent.be)

The main concerns are the potential hazards of in vivo position shift and the heating effect of the bullet within the MRI magnetic field. (sajr.org.za)
6 A recent study found that only highly ferromagnetic bullets can potentially shift in vivo position within MRI magnetic fields and that most bullets are non-ferromagnetic. (sajr.org.za)

Also MRI in children requires sedation and is susceptible to motion artefacts. (waocp.com)

Scanning with X and Y gradient coils causes a selected region of the patient to experience the exact magnetic field required for the energy to be absorbed. (wikipedia.org)
The RF signal may be processed to deduce position information by looking at the changes in RF level and phase caused by varying the local magnetic field using gradient coils. (wikipedia.org)
The major components of an MRI scanner are the main magnet, which polarizes the sample, the shim coils for correcting shifts in the homogeneity of the main magnetic field, the gradient system which is used to localize the region to be scanned and the RF system, which excites the sample and detects the resulting NMR signal. (wikipedia.org)

Here, we quantify the effect of commercially available 32 and 64 electrode caps on the quality of MR images obtained in scanners operating at magnetic fields of 1.5, 3 and 7 T, via the use of MR-based, field-mapping techniques and analysis of the SNR in echo planar image time series. (researchgate.net)
In particular, the effects of magnetic field inhomogeneities are described, both on echo planar imaging (EPI) data and on spiral imaging data. (ox.ac.uk)

To perform a study, the person is positioned within an MRI scanner that forms a strong magnetic field around the area to be imaged. (wikipedia.org)

MRI requires a magnetic field that is both strong and uniform to a few parts per million across the scan volume. (wikipedia.org)

In fact, MRI is the primary imaging modality used in the study of ependymomas. (medscape.com)

Magnetic resonance imaging (MRI) is a medical imaging technique used in radiology to form pictures of the anatomy and the physiological processes of the body. (wikipedia.org)
In machine learning research for medical imaging, the most common choices for loss functions include minimising the pixel-wise \(L_1\) or \(L_2\) losses, since they are easy to compute and usually lead to quick convergence [ 18 ]. (springer.com)

Thus, considering the potential utility of low-field, open MR systems for MR-guided endovascular interventions, it is important to be aware of the safety of such applications for metallic guidewires and the potential hazards associated with using a guidewire with MR systems operating at higher static magnetic field strengths, including 3-Tesla. (mrisafety.com)

MOCOnet was significantly better than the baseline method in suppressing motion artefacts and more consistently (p = 0.007). (ox.ac.uk)

In this study, we developed a model to simultaneously correct for all four aforementioned artefacts using multi-task learning. (springer.com)
Progressive ventricles enlargement and cerebrospinal fluid volume increases as a marker of neurodegeneration in patients with spinal cord injury: A longitudinal magnetic resonance imaging study. (mpg.de)
On the low-field system, fast imaging of the trace of the diffusion tensor (trace(D)) was optimised and employed during a study of repeated ischaemic episodes that is a model of transient ischaemic attacks. (ucl.ac.uk)
If a tumor is suspected, magnetic resonance imaging (MRI) is the next study performed. (medscape.com)

Exogenous contrast agents may be given to the person to make the image clearer. (wikipedia.org)
The 128 slice CT with a 0.38 sec rotational speed, which reduces kinetic artefacts, examination time, and contrast volume. (mahameru.com.my)
In contrast, emerging data-driven deep learning approaches have shown good performance in general image registration tasks. (ox.ac.uk)

First, energy from an oscillating magnetic field is temporarily applied to the patient at the appropriate resonance frequency. (wikipedia.org)
Four of the most significant tasks for improving MRI image quality have been bias field correction, super-resolution, motion-, and noise correction. (springer.com)
Although microscopy techniques used for calcium imaging have generally a small field of view, complete transparency over larger areas is critical to use them with wide-field voltage imaging or in serial calcium imaging experiments to correlate small-scale and large-scale dynamic networks. (nature.com)
Certain atomic nuclei can absorb and emit radio frequency energy when placed in an external magnetic field . (alchetron.com)

Subsequently, interval delay scanning (perfusion images) was taken to demonstrate parenchymal flow. (bmj.com)

Typically, this analysis requires accurate segmentation of the image. (uu.se)

Anatomy3

Diseases2

Chemicals and Drugs16

Analytical, Diagnostic and Therapeutic Techniques and Equipment63

Psychiatry and Psychology1

Phenomena and Processes24

Disciplines and Occupations2

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FMRI6

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Produce artefacts1

Functional5

Brain19

Quantification3

Quantitative8

Ballistocardiogram1

Abstract1

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Prone3

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Diagnostic4

Simultaneous5

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Distortion3

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Methods7

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Coils3

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Scan1

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Perfusion images1

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