Improved optimization strategies for autofocusing motion compensation in MRI via the analysis of image metric maps.

abstract：:A numerical method is applied to calculate an optimal distribution of currents in air which generate the magnetic field gradients required to spatially encode the radiofrequency signal in a NMR tomographic experiment. We compare the performances of the gradient circuits for the whole body air-core electromagnet descri...

journal_title：Magnetic resonance imaging

authors： Mustarelli P,Rudnicki M,Savini A,Savoldi F,Villa M

更新日期：1990-01-01 00:00:00

abstract：PURPOSE:To implement and evaluate interleaved blip-up, blip-down, non-segmented 3D echo planar imaging (EPI) with pseudo-continuous arterial spin labeling (pCASL) and post-processing for reduced susceptibility artifact cerebral blood flow (CBF) maps. MATERIALS AND METHODS:3D EPI non-segmented acquisition with a pCASL ...

journal_title：Magnetic resonance imaging

authors： Gai ND,Chou YY,Pham D,Butman JA

更新日期：2017-12-01 00:00:00

abstract：:In certain nuclear magnetic resonance (NMR) applications in which accessibility to the gantry is limited, performing optimal tuning and matching represents a major problem. Here, we discuss a method of tuning NMR probe circuits and matching their impedances which uses cables with different impedance values. This simpl...

journal_title：Magnetic resonance imaging

authors： Villa P,Vaquero JJ,Chesnick S,Ruiz-Cabello J

更新日期：1999-09-01 00:00:00

abstract：:The prevalence of cartilage lesions is much higher in football athletes than in the general population. Delayed gadolinium-enhanced MRI of cartilage (dGEMRIC) has been shown to quantify regional variations of glycosaminoglycan (GAG) concentrations which is an indicator of early cartilage degeneration. The goal of this...

journal_title：Magnetic resonance imaging

authors： Wei W,Lambach B,Jia G,Flanigan D,Chaudhari AMW,Wei L,Rogers A,Payne J,Siston RA,Knopp MV

更新日期：2017-06-01 00:00:00

abstract：OBJECTIVE:To test if three-dimensional (3D) cine spatial frequency-temporal frequency Broad-use Linear Acquisition Speed-up Technique (k-t BLAST) is suitable for rapid evaluation of global and regional left ventricular (LV) functional parameters and to evaluate the influence of gadolinium administration. MATERIALS AND...

journal_title：Magnetic resonance imaging

authors： Huber S,Muthupillai R,Mojibian H,Cheong B,Kouwenhoven M,Flamm SD

更新日期：2008-07-01 00:00:00

abstract：:An inductively coupled surface coil for imaging the rat spine at 7 T is described. This planar circular probe was made from microwave substrate to limit the size of the coil and to minimize the magnetic susceptibility. The surface coil was used as a single transmit/receive coil and as a receive-only coil with a birdca...

journal_title：Magnetic resonance imaging

authors： Banson ML,Cofer GP,Hedlund LW,Johnson GA

更新日期：1992-01-01 00:00:00

abstract：:We retrospectively compared the diagnostic accuracy of abdominal ultrasound (US), computed tomography (CT), and magnetic resonance imaging (MRI) studies performed on the same individual to determine the relative performance of these modalities in the evaluation of disease processes, arising from different intra-abdomi...

journal_title：Magnetic resonance imaging

authors： Noone TC,Semelka RC,Chaney DM,Reinhold C

更新日期：2004-01-01 00:00:00

abstract：PURPOSE:To develop a RF coil system for joint imaging of intracranial and extracranial arterial vessel wall at 3T. MATERIALS AND METHOD:The coil system consists of a 24-channel head coil combined with an 8-channel carotid coil. It is compared with a standard coil configuration (12-channel head coil+4-channel neck coil...

journal_title：Magnetic resonance imaging

authors： Hu X,Li Y,Zhang L,Zhang X,Liu X,Chung YC

更新日期：2017-02-01 00:00:00

abstract：:We have applied diffusion and relaxation Nuclear Magnetic Resonance experiments to investigate the translational and rotational mobility of adsorbents on quartz and calcite mineral surfaces. On both surfaces it was found that water is the dominant molecule. On the quartz surface the majority of water molecules have a ...

journal_title：Magnetic resonance imaging

authors： Sørgård HN,Totland C,Nerdal W,Seland JG

更新日期：2019-02-01 00:00:00

abstract：PURPOSE:To investigate the alterations in water-fat (W-F) ratio of the normal breast tissue of female volunteers as a function of the histological phases of the menstrual cycle. METHODS:Image-guided volume localized in vivo proton ((1)H) magnetic resonance spectroscopy (MRS) at 1.5 T was carried out in the para-areola...

journal_title：Magnetic resonance imaging

authors： Sharma U,Kumar M,Sah RG,Jagannathan NR

更新日期：2009-07-01 00:00:00

abstract：:A new magnetic resonance imaging technique was applied to the Taylor-Couette and spiral Poiseuille (Taylor-Couette with superposed mean axial flux) flows for the first time. The experimental technique is a combination of spatial tagging methods and a snapshot FLASH imaging sequence, which allows the full-field visuali...

journal_title：Magnetic resonance imaging

authors： Moser KW,Raguin LG,Harris A,Morris HD,Georgiadis J,Shannon M,Philpott M

更新日期：2000-02-01 00:00:00

abstract：:Ten patients with biopsy-proved synovial sarcoma were evaluated by magnetic resonance (MR) imaging on a 1.5-T unit. The lesions showed intermediate signal intensity on T1-weighted images and heterogeneous high signal intensity on T2-weighted images. Tumors were well-demarcated from normal tissues. Additional informati...

journal_title：Magnetic resonance imaging

authors： Mahajan H,Lorigan JG,Shirkhoda A

更新日期：1989-03-01 00:00:00

abstract：:Acrylamide gel loaded with phosphate has been used in two compartment phantoms designed to assess localized spectroscopy techniques. A chemical shift difference of 2.3 ppm was produced by changing the pH from 6 to 8.9. The 31P relaxation times were modified by doping the gels with paramagnetic ions. For a T1 of approx...

journal_title：Magnetic resonance imaging

authors： Howe FA,Griffiths JR

更新日期：1992-01-01 00:00:00

abstract：:With the conventional 3D MR angiographic sequences, it is difficult to prescribe multiple phases in different orientations, though multiple phases may be prescribed in the same orientation as the initial scan. Magnetic resonance angiography (MRA) was performed in which three slabs were prescribed in different orientat...

journal_title：Magnetic resonance imaging

authors： Shetty AN,Bis KG

更新日期：1999-07-01 00:00:00

abstract：PURPOSE:Our study aimed to develop accelerated microscopic diffusional kurtosis imaging (μDKI) and preliminarily evaluated it in a rodent model of chronic epilepsy. METHODS:We investigated two μDKI acceleration schemes of reduced sampling density and angular range in a phantom and wild-type rats, and further tested μD...

journal_title：Magnetic resonance imaging

authors： Ji Y,Lu D,Wu L,Qiu B,Song YQ,Sun PZ

更新日期：2019-02-01 00:00:00

abstract：:The development of NMR diffusion imaging and diffusion tensor imaging (DTI) has offered the possibility of studying the porous structures beyond anatomical imaging. In fact, random molecular motions, within tissue components, probe tissue microstructures. Up to now, the DTI method was mainly used to investigate cerebr...

journal_title：Magnetic resonance imaging

authors： Rossi C,Capuani S,Fasano F,Alesiani M,Maraviglia B

更新日期：2005-02-01 00:00:00

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

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

更新日期：1989-11-01 00:00:00

abstract：PURPOSE:To evaluate the use of the double-echo steady-state (DESS) sequence for acquiring high-resolution breast images with diffusion and T2 weighting. MATERIALS AND METHODS:Phantom scans were used to verify the T2 and diffusion weighting of the DESS sequence. Image distortion was evaluated in volunteers by comparing...

journal_title：Magnetic resonance imaging

authors： Granlund KL,Staroswiecki E,Alley MT,Daniel BL,Hargreaves BA

更新日期：2014-05-01 00:00:00

abstract：:In pharmacological magnetic resonance imaging (phMRI) with anesthetized animals, there is usually only a single time window to observe the dynamic signal change to an acute drug administration since subsequent drug injections are likely to result in altered response properties (e.g., tolerance). Unlike the block-desig...

journal_title：Magnetic resonance imaging

authors： Lu H,Yang S,Zuo Y,Demny S,Stein EA,Yang Y

更新日期：2008-11-01 00:00:00

abstract：:In ultrashort TE (UTE) imaging, the short T2 values of the tissues of interest are comparable to the k-space readout duration, which result in significant T2 decay during k-space readout. This decay consequently causes significant effects on signal and contrast in UTE sequences, which we evaluate in this paper using m...

journal_title：Magnetic resonance imaging

authors： Chiang JT,Carl M,Du J

更新日期：2014-04-01 00:00:00

abstract：:A single-sided mobile NMR apparatus with a small Halbach magnet was constructed for the first time. It is lightweight, compact and exhibits good sensitivity. The weight of the device is only 2 kg, and the NMR signal of the pencil eraser block can be detected in one shot using the device. This study describes the chara...

journal_title：Magnetic resonance imaging

authors： Chang WH,Chen JH,Hwang LP

更新日期：2006-10-01 00:00:00

abstract：:Radial acquisitions can suffer from trajectory errors leading to reduced image quality. Here we present a new method of trajectory correction that uses all spokes of a radial acquisition and compare it to an existing method that uses a two-spoke pre-scan calibration. For both methods, estimates of the necessary shifts...

journal_title：Magnetic resonance imaging

authors： Buonincontri G,Methner C,Krieg T,Carpenter TA,Sawiak SJ

更新日期：2014-09-01 00:00:00

abstract：:In recent years there has been increasing interest in applying magnetic resonance (MR) techniques in areas of engineering and chemical technology. The science that underpins many of these applications is the physics and chemistry of transport and reaction processes in porous materials. Key to the exploitation of MR me...

journal_title：Magnetic resonance imaging

authors： Gladden LF,Alexander P,Britton MM,Mantle MD,Sederman AJ,Yuen EH

更新日期：2003-04-01 00:00:00

abstract：PURPOSE:To provide a comprehensive understanding of multi-shot EPI diffusion imaging methods by comparing Readout segmented EPI (RS-EPI) and interleaved EPI (iEPI). MATERIALS AND METHODS:RS-EPI and iEPI were compared on the same 3T scanner. A 2D navigator was used for both RS-EPI and iEPI for phase correction. Signal ...

journal_title：Magnetic resonance imaging

authors： Wang Y,Ma X,Zhang Z,Dai E,Jeong HK,Xie B,Yuan C,Guo H

更新日期：2018-04-01 00:00:00

abstract：OBJECTIVES:To compare the accuracy of contrast-enhanced ultrasound (CEUS) and Dynamic contrast-enhanced (DCE) magnetic resonance imaging (MRI) for the assessment of changes in tissue vascularization as result of sorafenib treatment in a rat model of hepatocellular carcinoma (HCC). METHODS:Male Buffalo rats with orthot...

journal_title：Magnetic resonance imaging

authors： Muñoz NM,Minhaj AA,Maldonado KL,Kingsley CV,Cortes AC,Taghavi H,Polak U,Mitchell JM,Ensor JE,Bankson JA,Rashid A,Avritscher R

更新日期：2019-04-01 00:00:00

abstract：:Functional MR (fMR) imaging techniques based on blood oxygenation level dependent (BOLD) effects were developed and applied to a rat brain tumor model to evaluate the potential utility of the method for characterizing tumor growth and regression following treatment. Rats bearing 9L brain tumors in situ were imaged dur...

journal_title：Magnetic resonance imaging

authors： Mazurchuk R,Zhou R,Straubinger RM,Chau RI,Grossman Z

更新日期：1999-05-01 00:00:00

abstract：:In-plane flow quantification in MRI offers the potential for assessing vessel patency, and both volume flow rate and flow velocity. These techniques will have definite future impact on MR angiography. The method used in this paper employs motion artifact suppression technique (MAST) gradients to refocus spins travelli...

journal_title：Magnetic resonance imaging

authors： Duerk JL,Pattany PM

更新日期：1988-05-01 00:00:00

abstract：PURPOSE:To implement and evaluate the accuracy of non-invasive temperature mapping using MRI methods based on the chemical shift (CS) and T1 relaxation in media of various heterogeneity during focal (laser) and external thermal energy deposition. MATERIALS AND METHODS:All measurements were performed on a 1.5 T superco...

journal_title：Magnetic resonance imaging

authors： Bertsch F,Mattner J,Stehling MK,Müller-Lisse U,Peller M,Loeffler R,Weber J,Messmer K,Wilmanns W,Issels R,Reiser M

更新日期：1998-05-01 00:00:00

abstract：:The goal of this study was to determine whether presurgical metabolite levels measured by 3D MR Spectroscopic Imaging (MRSI) can accurately detect viable cancer within human brain tumor masses. A total of 31 patients (33 exams, 39 pathology correlations) with brain tumors were studied prior to surgical biopsy and/or r...

journal_title：Magnetic resonance imaging

authors： Vigneron D,Bollen A,McDermott M,Wald L,Day M,Moyher-Noworolski S,Henry R,Chang S,Berger M,Dillon W,Nelson S

更新日期：2001-01-01 00:00:00

abstract：:Use of conjugated equine estrogens (CEE) has been linked to smaller regional brain volumes in women aged ≥65 years; however, it is unknown whether this results in a broad-based characteristic pattern of effects. Structural magnetic resonance imaging was used to assess regional volumes of normal tissue and ischemic les...

journal_title：Magnetic resonance imaging

authors： Casanova R,Espeland MA,Goveas JS,Davatzikos C,Gaussoin SA,Maldjian JA,Brunner RL,Kuller LH,Johnson KC,Mysiw WJ,Wagner B,Resnick SM,Women's Health Initiative Memory Study.

更新日期：2011-05-01 00:00:00