Echo-shifted multislice EPI for high-speed fMRI.


:The advantages of event-related functional Magnetic Resonance Imaging (fMRI) and the increasing use of fMRI in cognitive experiments are both driving the development of techniques that allow images sensitive to the blood oxygen level-dependent effect to be acquired at ever-higher temporal resolution. Here, we present a technique based on the use of echo shifting (ES) in conjunction with a multislice (MS) echo planar imaging (EPI) readout, which allows T2*-weighted images to be generated with a repetition time per slice that is less than the echo time (TE). Using this ES-MS-EPI approach, it is shown that images with a TE of 40 ms can be acquired with an acquisition time per slice of only 27 ms. The utility of the MS-ES-EPI sequence is demonstrated in a visual-motor, event-related fMRI study in which nine-slice image volumes are acquired continuously at a rate of 4.1 Hz. The sequence is shown to produce reliable activation associated with both visual stimuli and motor actions.


Magn Reson Imaging


Gibson A,Peters AM,Bowtell R




Has Abstract


2006-05-01 00:00:00














  • 4D MR phase and magnitude segmentations with GPU parallel computing.

    abstract::The increasing size and number of data sets of large four dimensional (three spatial, one temporal) magnetic resonance (MR) cardiac images necessitates efficient segmentation algorithms. Analysis of phase-contrast MR images yields cardiac flow information which can be manipulated to produce accurate segmentations of t...

    journal_title:Magnetic resonance imaging

    pub_type: 杂志文章


    authors: Bergen RV,Lin HY,Alexander ME,Bidinosti CP

    更新日期:2015-01-01 00:00:00

  • Spatial heterogeneity in the muscle functional MRI signal intensity time course: effect of exercise intensity.

    abstract::It has previously been observed that during isometric dorsiflexion exercise, the time course of T2-weighted signal intensity (SI) changes is spatially heterogeneous. The purpose of this study was to test the hypothesis that this spatial heterogeneity would increase at higher contraction intensities. Eight subjects per...

    journal_title:Magnetic resonance imaging

    pub_type: 杂志文章


    authors: Damon BM,Wadington MC,Lansdown DA,Hornberger JL

    更新日期:2008-10-01 00:00:00

  • SSFP fMRI at 3 tesla: Efficiency of polar acquisition-reconstruction technique.

    abstract::SSFP-based fMRI techniques, known for their high specificity and low geometrical distortion, look promising for high-resolution brain mapping. Nevertheless, they suffer from lack of speed and sensitivity, leading them to be exploited mostly in high-field scanners. Radial acquisition can help with these inefficiencies ...

    journal_title:Magnetic resonance imaging

    pub_type: 杂志文章


    authors: Malekian V,Rastegar F,Shafieizargar B,Nasiraei-Moghaddam A

    更新日期:2020-12-01 00:00:00

  • A robust electrical conductivity imaging method with total variation and wavelet regularization.

    abstract:PURPOSE:This study aims to develop and evaluate a robust conductivity imaging method that combines total variation and wavelet regularization to enhance the accuracy of conductivity maps. THEORY AND METHODS:The proposed approach is based on a gradient-based method. The central equation is derived from Maxwell's equati...

    journal_title:Magnetic resonance imaging

    pub_type: 杂志文章


    authors: Sun X,Lu L,Qi L,Mei Y,Liu X,Chen W

    更新日期:2020-06-01 00:00:00

  • Cortical morphologic changes in recent-onset, drug-naïve idiopathic generalized epilepsy.

    abstract:PURPOSE:Only a few studies have investigated the brain morphology abnormalities in structural MRI in patients with drug-naïve idiopathic generalized epilepsy (IGE) and mainly focused on brain volume changes. In the present study, we aimed to investigate the changes in three morphologic measurement differences including...

    journal_title:Magnetic resonance imaging

    pub_type: 杂志文章


    authors: Deng DM,Chen LZ,Li YW,Long R,Tang GC,Han FG,Diao XM,Chen HL,Long ZL,Qiu LH

    更新日期:2019-09-01 00:00:00

  • Isotropically weighted intravoxel incoherent motion brain imaging at 7T.

    abstract::Perfusion magnetic resonance imaging (MRI) is a promising non-invasive technique providing insights regarding the brain's microvascular architecture in vivo. The scalar perfusion metrics can be used for quantitative diagnostics of various brain abnormalities, in particular, in the stroke cases and tumours. However, co...

    journal_title:Magnetic resonance imaging

    pub_type: 杂志文章


    authors: Maximov II,Vellmer S

    更新日期:2019-04-01 00:00:00

  • Quantitative susceptibility mapping of prostate with separate calculations for water and fat regions for reducing shading artifacts.

    abstract::We propose a novel processing method for reducing shading artifacts in quantitative susceptibility mapping (QSM) for prostate imaging. In the conventional method, calculation errors in the boundary regions between water and fat cause shading artifacts that degrade the image quality for QSM. In the proposed method, wat...

    journal_title:Magnetic resonance imaging

    pub_type: 杂志文章


    authors: Sato R,Shirai T,Soutome Y,Bito Y,Ochi H

    更新日期:2020-02-01 00:00:00

  • Off-resonance frequency filtered magnetic resonance imaging.

    abstract::One of the main problems with rapid magnetic resonance imaging (MRI) techniques is the artifacts that result from off-resonance effects. The proposed off-resonance frequency filtered MRI (OFF-MRI) method focuses on the elimination of off-resonance components from the image of the observed object. To maintain imaging s...

    journal_title:Magnetic resonance imaging

    pub_type: 杂志文章


    authors: Medic J,Tomazic S

    更新日期:2010-05-01 00:00:00

  • Quantitative SENSE-MRSI of the human brain.

    abstract:PURPOSE:To develop a method for estimating metabolite concentrations using phased-array coils and sensitivity-encoded (SENSE) magnetic resonance spectroscopic images (MRSI) of the human brain. MATERIALS AND METHODS:The method is based on the phantom replacement technique and uses receive coil sensitivity maps and body...

    journal_title:Magnetic resonance imaging

    pub_type: 杂志文章


    authors: Bonekamp D,Smith MA,Zhu H,Barker PB

    更新日期:2010-04-01 00:00:00

  • Clinical implementation of a multislice high spectral and spatial resolution-based MRI sequence to achieve unilateral full-breast coverage.

    abstract::High-resolution, single-slice, high spatial and spectral resolution (HiSS) breast magnetic resonance imaging (MRI) provides improved lesion conspicuity, margin definition and internal definition, as compared to conventional clinical MRI - and thus may provide better lesion characterization and increase breast MRI spec...

    journal_title:Magnetic resonance imaging

    pub_type: 杂志文章


    authors: Medved M,Newstead GM,Abe H,Olopade OI,Shimauchi A,Zamora MA,Karczmar GS

    更新日期:2010-01-01 00:00:00

  • GRAPPA-based susceptibility-weighted imaging of normal volunteers and patients with brain tumor at 7 T.

    abstract::Susceptibility-weighted imaging (SWI) is a valuable technique for high-resolution imaging of brain vasculature that greatly benefits from the emergence of higher field strength MR scanners. Autocalibrating partially parallel imaging techniques can be employed to reduce lengthy acquisition times as long as the decrease...

    journal_title:Magnetic resonance imaging

    pub_type: 杂志文章


    authors: Lupo JM,Banerjee S,Hammond KE,Kelley DA,Xu D,Chang SM,Vigneron DB,Majumdar S,Nelson SJ

    更新日期:2009-05-01 00:00:00

  • Chemical exchange magnetic resonance imaging (CHEMI).

    abstract::Systems investigated with NMR spectroscopy are sometimes heterogeneous with respect to chemical composition, rates of chemical exchange, and other properties influencing magnetic resonance parameters. A method was developed to spatially encode reaction kinetic information and produce NMR images sensitive to chemical e...

    journal_title:Magnetic resonance imaging

    pub_type: 杂志文章


    authors: McFarland EW,Neuringer LJ,Kushmerick MJ

    更新日期:1988-09-01 00:00:00

  • NMR study of the diffusion processes in gels.

    abstract::Stimulated spin-echo and Carr-Purcell pulse sequences, with pulsed magnetic field gradients, have been used to study the self-diffusion processes of the water in swollen and in supercoiled polyacrylamide gels and in polysaccharides agarose gels, for different polymer concentrations. Restricted diffusion effects are ev...

    journal_title:Magnetic resonance imaging

    pub_type: 杂志文章


    authors: Pavesi L,Balzarini M

    更新日期:1996-01-01 00:00:00

  • STrategically Acquired Gradient Echo (STAGE) imaging, part II: Correcting for RF inhomogeneities in estimating T1 and proton density.

    abstract:PURPOSE:To develop a method for mapping the B1 transmit (B1t) and B1 receive (B1r) fields from two gradient echo datasets each with a different flip angle and from these two images obtain accurate T1 and proton density (PD) maps of the brain. METHODS:A strategically acquired gradient echo (STAGE) data set is collected...

    journal_title:Magnetic resonance imaging

    pub_type: 杂志文章


    authors: Wang Y,Chen Y,Wu D,Wang Y,Sethi SK,Yang G,Xie H,Xia S,Haacke EM

    更新日期:2018-02-01 00:00:00

  • Diffusion tensor imaging of native and degenerated human articular cartilage.

    abstract::Diffusion tensor imaging (DTI) is potentially sensitive to collagen degeneration in cartilage. In this study, DTI was measured on human cartilage samples with interventions of trypsin and collagenase. The measured preferred diffusion direction was consistent with the zonal structure of collagen network. The glycosamin...

    journal_title:Magnetic resonance imaging

    pub_type: 杂志文章


    authors: Deng X,Farley M,Nieminen MT,Gray M,Burstein D

    更新日期:2007-02-01 00:00:00

  • Measurements of RF heating during 3.0-T MRI of a pig implanted with deep brain stimulator.

    abstract:PURPOSE:To present preliminary, in vivo temperature measurements during MRI of a pig implanted with a deep brain stimulation (DBS) system. MATERIALS AND METHODS:DBS system (Medtronic Inc., Minneapolis, MN) was implanted in the brain of an anesthetized pig. 3.0-T MRI was performed with a T/R head coil using the low-SAR...

    journal_title:Magnetic resonance imaging

    pub_type: 杂志文章


    authors: Gorny KR,Presti MF,Goerss SJ,Hwang SC,Jang DP,Kim I,Min HK,Shu Y,Favazza CP,Lee KH,Bernstein MA

    更新日期:2013-06-01 00:00:00

  • Magnetic resonance imaging appearance of metastatic Merkel cell carcinoma to the sacrum and epidural space.

    abstract::Merkel cell carcinoma (MCC) is a rare malignant tumor of the skin and often is diagnosed histologically as lymphoma, melanoma and even metastatic small cell carcinoma of the lung (SCCL). Classified as a neuroendocrine tumor, clinically it originates in the head and neck region and may present with metastatic disease a...

    journal_title:Magnetic resonance imaging

    pub_type: 杂志文章


    authors: Moayed S,Maldjianb C,Adam R,Bonakdarpour A

    更新日期:2000-10-01 00:00:00

  • MRI-assisted radiation therapy planning of brain tumors--clinical experiences in 17 patients.

    abstract::A new and simple method for precise determination of lateral opposed treatment portals was developed and used in 17 patients. Compared to CT, MRI led to significant changes of portals in 59% (10/17) of cases. Individual shielding blocks could be precisely designed by use of our new method. MRI is the procedure of choi...

    journal_title:Magnetic resonance imaging

    pub_type: 杂志文章


    authors: Just M,Rösler HP,Higer HP,Kutzner J,Thelen M

    更新日期:1991-01-01 00:00:00

  • Investigations of polymer dynamics in nanoporous media by field cycling NMR relaxometry and the dipolar correlation effect.

    abstract::The chain dynamics of short-chain perfluoropolyether melts confined in Vycor nanoporous media has been characterized by field cycling nuclear magnetic resonance relaxometry and the dipolar correlation effect. The slowdown of motions under confinement, leading to larger residual dipolar couplings, has been probed by lo...

    journal_title:Magnetic resonance imaging

    pub_type: 杂志文章


    authors: Kausik R,Fatkullin N,Hüsing N,Kimmich R

    更新日期:2007-05-01 00:00:00

  • Evaluation of water content by spatially resolved transverse relaxation times of human articular cartilage.

    abstract::Non-invasive assessment of cartilage properties, specifically water content, could prove helpful in the diagnosis of early degenerative joint diseases. Transverse relaxation times T(2) of human articular cartilage (34 cartilage slices of three donors) were measured on a pixel-by-pixel basis in a clinical whole body MR...

    journal_title:Magnetic resonance imaging

    pub_type: 杂志文章


    authors: Lüsse S,Claassen H,Gehrke T,Hassenpflug J,Schünke M,Heller M,Glüer CC

    更新日期:2000-05-01 00:00:00

  • Effect of anesthesia on the signal intensity in tumors using BOLD-MRI: comparison with flow measurements by Laser Doppler flowmetry and oxygen measurements by luminescence-based probes.

    abstract::BOLD-contrast functional magnetic resonance imaging (MRI) was used to assess the evolution of tumor oxygenation and blood flow after administration of four different anesthetics: pentobarbital (60 mg/kg), ketamine/xylazine (80/8 mg/kg), fentanyl/droperidol (0.078/3.9 mg/kg), and isoflurane (1.5%). Gradient echo sequen...

    journal_title:Magnetic resonance imaging

    pub_type: 杂志文章


    authors: Baudelet C,Gallez B

    更新日期:2004-09-01 00:00:00

  • Biodegradable cystamine spacer facilitates the clearance of Gd(III) chelates in poly(glutamic acid) Gd-DO3A conjugates for contrast-enhanced MR imaging.

    abstract::Poly(L-glutamic acid) (PGA)-cystamine-[gadolinium (Gd)-DO3A] was prepared in high yield with a high Gd-DO3A conjugation efficiency. Approximately 55% of the carboxylic groups in PGA were loaded with Gd-DO3A via cystamine as the spacer. Cystamine can be readily cleaved by endogenous thiols to release the Gd(III) chelat...

    journal_title:Magnetic resonance imaging

    pub_type: 杂志文章


    authors: Ke T,Feng Y,Guo J,Parker DL,Lu ZR

    更新日期:2006-09-01 00:00:00

  • Effect of physiological heart rate variability on quantitative T2 measurement with ECG-gated Fast Spin Echo (FSE) sequence and its retrospective correction.

    abstract:OBJECT:Quantitative T2 measurement is applied in cardiac Magnetic Resonance Imaging (MRI) for the diagnosis and follow-up of myocardial pathologies. Standard Electrocardiogram (ECG)-gated fast spin echo pulse sequences can be used clinically for T2 assessment, with multiple breath-holds. However, heart rate is subject ...

    journal_title:Magnetic resonance imaging

    pub_type: 杂志文章


    authors: de Roquefeuil M,Vuissoz PA,Escanyé JM,Felblinger J

    更新日期:2013-11-01 00:00:00

  • A method for imaging of chemical shift or magnetic field distributions.

    abstract::A phase encoding method for imaging of chemical shift or magnetic field distributions is described. The method utilizes the spin-echo principle and the time period between signal collection and excitation is constant but the time period between excitation and the 180 degrees pulse is varied by constant steps. The meth...

    journal_title:Magnetic resonance imaging

    pub_type: 杂志文章


    authors: Sepponen RE

    更新日期:1985-01-01 00:00:00

  • Microstructure abnormity in the optic nerve of type 1 diabetic rats revealed by diffusion tensor imaging study.

    abstract::Diabetic retinopathy (DR) is one of a major complication of type 1 diabetes mellitus (T1DM) and a leading cause of blindness. Evidence of animal study has shown that it is not only a microvasucular lesion of the eye, but also a neurodegeneration disease of the visual system. However, the in vivo imaging evidence of ax...

    journal_title:Magnetic resonance imaging

    pub_type: 杂志文章


    authors: Gao L,Huang M,Luo X,Song T,Wang X,Wang Z,Zhang W,Chen J,Lei H

    更新日期:2020-09-01 00:00:00

  • The study of heat stress in tomato fruits by NMR microimaging.

    abstract::The ripening of the tomato fruit was delayed for several days (average 5 days) by a 1-day heat treatment at 42 degrees C. Ethylene production increased during the first 3 h, but, after 6 h inhibition was almost total in tomato fruit incubated at 42 degrees C. However, recovery of ethylene production was rapid if fruit...

    journal_title:Magnetic resonance imaging

    pub_type: 杂志文章


    authors: Iwahashi Y,Horigane AK,Yoza K,Nagata T,Hosoda H

    更新日期:1999-06-01 00:00:00

  • Pulsed arterial spin labeling perfusion imaging at 3 T: estimating the number of subjects required in common designs of clinical trials.

    abstract::Pulsed arterial spin labeling (PASL) is an increasingly common technique for noninvasively measuring cerebral blood flow (CBF) and has previously been shown to have good repeatability. It is likely to find a place in clinical trials and in particular the investigation of pharmaceutical agents active in the central ner...

    journal_title:Magnetic resonance imaging

    pub_type: 杂志文章


    authors: Murphy K,Harris AD,Diukova A,Evans CJ,Lythgoe DJ,Zelaya F,Wise RG

    更新日期:2011-12-01 00:00:00

  • MRI of polysplenia syndrome.

    abstract::The polysplenia syndrome is the association of multiple spleens, situs inversus, congenital heart disease, and azygous continuation of the inferior vena cava. Magnetic resonance (MR) is a noninvasive imaging modality which can easily confirm the multiplicity of spleens, situs inversus, and identify complex congenital ...

    journal_title:Magnetic resonance imaging

    pub_type: 杂志文章


    authors: Jelinek JS,Stuart PL,Done SL,Ghaed N,Rudd SA

    更新日期:1989-11-01 00:00:00

  • Initial clinical evaluation of gadolinium DTPA for contrast-enhanced magnetic resonance imaging.

    abstract::Gadolinium DTPA was evaluated as an intravenous contrast agent for magnetic resonance imaging in 15 patients with primary or secondary intracranial neoplastic disease. T1 and T2 weighted images were obtained prior to contrast administration. T1 weighted spin echo 35/800 (TE/TR) images were utilized to detect enhanceme...

    journal_title:Magnetic resonance imaging

    pub_type: 杂志文章


    authors: Runge VM,Schoerner W,Niendorf HP,Laniado M,Koehler D,Claussen C,Felix R,James AE Jr

    更新日期:1985-01-01 00:00:00

  • Assessment of normal flow patterns in the pulmonary circulation by using 4D magnetic resonance velocity mapping.

    abstract:OBJECTIVE:The purpose of this study was to analyze flow patterns in the pulmonary circulation of healthy volunteers by using 4D flow magnetic resonance imaging. MATERIALS AND METHODS:The study was approved by the local ethics committee and all subjects gave written informed consent. Eighteen volunteers underwent a 4D ...

    journal_title:Magnetic resonance imaging

    pub_type: 杂志文章


    authors: Bächler P,Pinochet N,Sotelo J,Crelier G,Irarrazaval P,Tejos C,Uribe S

    更新日期:2013-02-01 00:00:00