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

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

更新日期：2007-02-01 00:00:00

abstract：:Microscopic magnetic resonance elastography is a high-resolution method for visualizing shear waves and assessing the biomechanical viscoelastic properties of small biological samples. In this work, we used error propagation to develop a simple analytical model that relates the signal-to-noise ratio of MR magnitude im...

journal_title：Magnetic resonance imaging

authors： Othman SF,Zhou XJ,Xu H,Royston TJ,Magin RL

更新日期：2007-01-01 00:00:00

abstract：:Automatic segmentation of different types of tissue from magnetic resonance images is of great importance for clinical and research applications, particularly large-scale and longitudinal studies of brain pathology. We developed a fully automated algorithm for the segmentation of lateral ventricles from cranial magnet...

journal_title：Magnetic resonance imaging

authors： Schönmeyer R,Prvulovic D,Rotarska-Jagiela A,Haenschel C,Linden DE

更新日期：2006-12-01 00:00:00

abstract：:The purpose of this study was to assess the benefits of a 3 T scanner and an eight-channel phased-array head coil for acquiring three-dimensional PRESS (Point REsolved Spectral Selection) proton (H-1) magnetic resonance spectroscopic imaging (MRSI) data from the brains of volunteers and patients with brain tumors rela...

journal_title：Magnetic resonance imaging

authors： Li Y,Osorio JA,Ozturk-Isik E,Chen AP,Xu D,Crane JC,Cha S,Chang S,Berger MS,Vigneron DB,Nelson SJ

更新日期：2006-12-01 00:00:00

abstract：:Susceptibility differences are common causes for artifacts in magnetic resonance (MR); therefore, it is important to choose phantom materials in a way that these artifacts are kept at a minimum. In this study, a previously proposed MR imaging (MRI) method [Beuf O, Briguet A, Lissac M, Davis R. Magnetic resonance imagi...

journal_title：Magnetic resonance imaging

authors： Carlsson A,Starck G,Ljungberg M,Ekholm S,Forssell-Aronsson E

更新日期：2006-11-01 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：:3D (kx, ky, t)-space analysis is invoked to provide insights into dynamic magnetic resonance imaging (DMRI) with arbitrary k-space sampling trajectories. The effects of 3D sampling in (kx, ky, t) are analyzed theoretically and verified with computer simulation. The analyses show that a 3D sampling pattern that is more...

journal_title：Magnetic resonance imaging

authors： Park JB,Nishimura DG

更新日期：2006-10-01 00:00:00

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

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

更新日期：2006-09-01 00:00:00

abstract：:Rapid maturational brain changes occur during adolescence--a time associated with risk-taking behaviors and improvements in cognition. The present study examined the relationship between white matter (WM) microstructure, impulsive behavior and response inhibition in female and male adolescents. Twenty-one healthy adol...

journal_title：Magnetic resonance imaging

authors： Silveri MM,Rohan ML,Pimentel PJ,Gruber SA,Rosso IM,Yurgelun-Todd DA

更新日期：2006-09-01 00:00:00

abstract：:Autofocusing is a postprocessing technique for motion correction, which optimizes an image quality metric against various trial motions. In this work, image metric maps, which are measures of image quality plotted as a function of in-plane 2-D trial translations, are systematically studied to develop improved autofocu...

journal_title：Magnetic resonance imaging

authors： Lin W,Song HK

更新日期：2006-07-01 00:00:00

abstract：PURPOSE:To evaluate the application of high-resolution MRI methodology for characterizing the fluid velocity field and evaluate fluid shear field within a simplified in vitro model of a bone-implant interface. MATERIALS AND METHODS:The study used a specific micromotion canine bone implant that has been used for over a...

journal_title：Magnetic resonance imaging

authors： Conroy MJ,Pédrono A,Bechtold JE,Søballe K,Ambard D,Swider P

更新日期：2006-06-01 00:00:00

abstract：:In independent component analysis (ICA), principal component analysis (PCA) is generally used to reduce the raw data to a few principal components (PCs) through eigenvector decomposition (EVD) on the data covariance matrix. Although this works for spatial ICA (sICA) on moderately sized fMRI data, it is intractable for...

journal_title：Magnetic resonance imaging

authors： Wang Z,Wang J,Calhoun V,Rao H,Detre JA,Childress AR

更新日期：2006-06-01 00:00:00

abstract：: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 ...

journal_title：Magnetic resonance imaging

authors： Gibson A,Peters AM,Bowtell R

更新日期：2006-05-01 00:00:00

abstract：:The application of MRI-visible paramagnetic tracers to reveal in vivo connectivity can provide important subject-specific information for multisite, multielectrode intracortical recordings in combined behavioral and physiology experiments. To establish the use of such tracers in the nonhuman primate, we recently compa...

journal_title：Magnetic resonance imaging

authors： Murayama Y,Weber B,Saleem KS,Augath M,Logothetis NK

更新日期：2006-05-01 00:00:00

abstract：:Many informatics tools have emerged to process the voluminous and complex data generated by functional magnetic resonance imaging (fMRI). The interpretation of fMRI exams is largely determined by these tools. However, their performance is hard to evaluate because there is no independent means of calibration. A novel f...

journal_title：Magnetic resonance imaging

authors： Cheng H,Zhao Q,Duensing GR,Edelstein WA,Spencer D,Browne N,Saylor C,Limkeman M

更新日期：2006-04-01 00:00:00

abstract：:The current fMRI study investigated correlations of low-frequency signal changes in the left inferior frontal gyrus, right inferior frontal gyrus and cerebellum in 13 adult dyslexic and 10 normal readers to examine functional networks associated with these regions. The extent of these networks to regions associated wi...

journal_title：Magnetic resonance imaging

authors： Stanberry LI,Richards TL,Berninger VW,Nandy RR,Aylward EH,Maravilla KR,Stock PS,Cordes D

更新日期：2006-04-01 00:00:00

abstract：:A 24-year-old woman (Gravida I, Para I) at estimated 32 weeks of pregnancy was referred to our department for evaluation of a suspected fetal gastroschisis. Ultrasound scan revealed multiple loops of dilated bowel outside the fetal abdomen and absence of membrane surrounding the herniated loops of the intestines. Thre...

journal_title：Magnetic resonance imaging

authors： Sasaki Y,Miyamoto T,Hidaka Y,Satoh H,Takuma N,Sengoku K,Sugimori H,Inaoka T,Aburano T

更新日期：2006-02-01 00:00:00

abstract：:Balanced steady-state free precession (SSFP) sequences use fully re-focussed gradient waveforms to achieve a high signal and useful image contrast in short scan times. Despite these strengths, the clinical feasibility of balanced SSFP is still limited both by bright fat signal and by the signal voids that result from ...

journal_title：Magnetic resonance imaging

authors： Hargreaves BA,Bangerter NK,Shimakawa A,Vasanawala SS,Brittain JH,Nishimura DG

更新日期：2006-02-01 00:00:00

abstract：:The goal of this study was to develop and evaluate high-resolution magnetic resonance spectroscopic imaging (MRSI) utilizing the gains in signal-to-noise ratio (SNR) provided by combining higher magnetic field with high-sensitivity phased-array (PA) coils. We investigated the maximum improvement in spatial resolution ...

journal_title：Magnetic resonance imaging

authors： Xu D,Chen AP,Cunningham C,Osorio JA,Nelson SJ,Vigneron DB

更新日期：2006-01-01 00:00:00

abstract：:A fast spin echo two-point Dixon (fast 2PD) technique was developed for efficient T2-weighted imaging with uniform water and fat separation. The technique acquires two interleaved fast spin echo images with water and fat in-phase and 180 degrees out-of-phase, respectively, and generates automatically separate water an...

journal_title：Magnetic resonance imaging

authors： Ma J,Son JB,Bankson JA,Stafford RJ,Choi H,Ragan D

更新日期：2005-12-01 00:00:00

abstract：:Fast gradient echo sequences, such as echo planer imaging (EPI) and spiral imaging, are vulnerable to artifacts resulting from B(0) inhomogeneities. A major contribution to these artifacts is the susceptibility variation across the head, which is most severe in regions adjacent to air-tissue interfaces, such as the mo...

journal_title：Magnetic resonance imaging

authors： Neufeld A,Assaf Y,Graif M,Hendler T,Navon G

更新日期：2005-11-01 00:00:00

abstract：:The ability to determine coil sensitivities implies that a method optimized in terms of maximized signal-to-noise ratio (SNR) can be applied to the combination of multiple coil images. An optimization of SNR subsequently results in a minimized variance in quantitative velocity measurements using phase-contrast imaging...

journal_title：Magnetic resonance imaging

authors： Thunberg P,Karlsson M,Wigström L

更新日期：2005-09-01 00:00:00

abstract：:Complete dissection is the current reference method to quantify muscle and fat tissue on pig carcasses. Magnetic resonance imaging (MRI) is an appropriate nondestructive alternative method that can provide reliable and quantitative information on pig carcass composition without losing the spatial information. We have ...

journal_title：Magnetic resonance imaging

authors： Monziols M,Collewet G,Mariette F,Kouba M,Davenel A

更新日期：2005-07-01 00:00:00

abstract：:Functional magnetic resonance imaging (FMRI) is a major tool for the evaluation of brain function and architecture. It is widely used by physicians, neuroscientists, psychologists and others. In order to process the data collected using FMRI, it is necessary to use post-acquisition processing software that employs mot...

journal_title：Magnetic resonance imaging

authors： Pickens DR,Li Y,Morgan VL,Dawant BM

更新日期：2005-06-01 00:00:00

abstract：:Deep brain stimulation (DBS) is used increasingly in the field of movement disorders. The implanted electrodes create not only a prior risk to patient safety during MRI, but also a unique opportunity in the collection of functional MRI data conditioned by direct neural stimulation. We evaluated MRI-related heating for...

journal_title：Magnetic resonance imaging

authors： Bhidayasiri R,Bronstein JM,Sinha S,Krahl SE,Ahn S,Behnke EJ,Cohen MS,Frysinger R,Shellock FG

更新日期：2005-05-01 00:00:00

abstract：:Quantitative cerebral blood flow (CBF) values can be determined from residue function estimates obtained from magnetic resonance dynamic susceptibility contrast (DSC) perfusion studies using a variety of deconvolution approaches. However, there are significant differences between the CBF estimates obtained, difference...

journal_title：Magnetic resonance imaging

authors： Salluzzi M,Frayne R,Smith MR

更新日期：2005-04-01 00:00:00

abstract：:Measurements of time-dependent diffusion are performed on a rock sample saturated first with water, then methane and finally ethane. The gases were selected because their increased diffusivities and relaxation times allow probing greater length scales than water and because of their practical relevance. The nuclear ma...

journal_title：Magnetic resonance imaging

authors： Flaum M,Hirasaki GJ,Flaum C,Straley C

更新日期：2005-02-01 00:00:00

abstract：:Magic-angle sample spinning is one of the cornerstones in high-resolution NMR of solid and semisolid materials. The technique enhances spectral resolution by averaging away rank 2 anisotropic spin interactions, thereby producing isotropic-like spectra with resolved chemical shifts and scalar couplings. In principle, i...

journal_title：Magnetic resonance imaging

authors： Sakellariou D,Meriles CA,Martin RW,Pines A

更新日期：2005-02-01 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：:In this contribution, we explore the potential of proton electron double resonance imaging (PEDRI) in environmental science (hydrogeological) applications. After a discussion of the hydrogeological motivation for studies of free radical transport in environmental matrices, we present results from first experiments tha...

journal_title：Magnetic resonance imaging

authors： Nestle N,Shet K,Lurie DJ

更新日期：2005-02-01 00:00:00

abstract：:Relaxation time measurements were carried out during the preacute stage of lesion progression in an animal model of demyelination created in the internal capsule (ic) area of the rat brain using lysophosphatidyl choline (LPC). T1 and T2 were determined both before and after 36 h of lesion creation. Histology carried o...

journal_title：Magnetic resonance imaging

authors： Degaonkar MN,Raghunathan P,Jayasundar R,Jagannathan NR

更新日期：2005-01-01 00:00:00

abstract：:Noninvasive functional studies on human spinal cord by means of magnetic resonance imaging (MRI) are gaining attention because of the promising applications in the study of healthy and injured central nervous system. The findings obtained are generally consistent with the anatomic knowledge based on invasive methods, ...

journal_title：Magnetic resonance imaging

authors： Giove F,Garreffa G,Giulietti G,Mangia S,Colonnese C,Maraviglia B

更新日期：2004-12-01 00:00:00

abstract：:Until recently, NMR imaging with intermolecular multiple-quantum coherences (iMQCs) has been based on the acquisition of a single echo. In vivo studies of iMQC image contrast would greatly benefit from a method that could acquire several orders of quantum coherence during the same acquisition. This would enable compar...

journal_title：Magnetic resonance imaging

authors： Shannon KL,Branca RT,Galiana G,Cenzano S,Bouchard LS,Soboyejo W,Warren WS

更新日期：2004-12-01 00:00:00

abstract：BACKGROUND AND PURPOSE:We occasionally encounter phenomena in which venous flow signals of the cavernous sinus (CS) and/or inferior petrosal sinus (IPS) are visualized paradoxically in patients without arteriovenous shunt in 3D time-of-flight magnetic resonance angiography (3D-TOF MRA) of the brain. The aims of this st...

journal_title：Magnetic resonance imaging

authors： Sakamoto M,Taoka T,Iwasaki S,Nakagawa H,Fukusumi A,Takayama K,Wada T,Kichikawa K

更新日期：2004-11-01 00:00:00

abstract：:Contrast-enhanced 3D MR voiding urethrography (CE 3D MRVU) was performed on 5 healthy volunteers and 18 patients with urethral disease. After intravenous injection of 0.3 ml/kg gadolinium, the images of the three consecutive acquisitions of the 3D MRVU technique were obtained during voiding. The raw data were reconstr...

journal_title：Magnetic resonance imaging

authors： Yekeler E,Suleyman E,Tunaci A,Tunaci M,Balci NC,Onem K,Tunc M,Acunas G

更新日期：2004-11-01 00:00:00

abstract：AIM:The study aimed to validate magnetic resonance microscopy (MRM) studies of forensic tissue specimens (skin samples with electric injury patterns) against the results from routine histology. METHODS AND RESULTS:Computed tomography and magnetic resonance imaging are fast becoming important tools in clinical and fore...

journal_title：Magnetic resonance imaging

authors： Thali MJ,Dirnhofer R,Becker R,Oliver W,Potter K

更新日期：2004-10-01 00:00:00

abstract：:Quantitative longitudinal brain magnetic resonance (MR) studies may be confounded by scanner-related drifts in voxel sizes. Total intracranial volume (TIV) normalisation is commonly used to correct serial cerebral volumetric measurements for these drifts. We hypothesised that automated rigid-body registration of whole...

journal_title：Magnetic resonance imaging

authors： Whitwell JL,Schott JM,Lewis EB,MacManus DG,Fox NC

更新日期：2004-09-01 00:00:00

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

authors： Baudelet C,Gallez B

更新日期：2004-09-01 00:00:00

abstract：:We report the MR appearance of undifferentiated (embryonal) sarcoma of the liver (USL) in a 13-year-old female who presented with a 1-year history of intermittent abdominal pain, weight loss, and fatigue. The tumor was a large, solitary, well-defined focal mass lesion with multiple cystic spaces, septations, and subst...

journal_title：Magnetic resonance imaging

authors： Psatha EA,Semelka RC,Fordham L,Firat Z,Woosley JT

更新日期：2004-07-01 00:00:00

abstract：:In the longitudinal study of multiple sclerosis (MS) lesions, varying position of the patient inside the MRI scanner is one of the major sources of assessment errors. We propose to use analytical indices that are invariant to spatial orientation to describe the lesions, rather than focus on patient repositioning or im...

journal_title：Magnetic resonance imaging

authors： Goldberg-Zimring D,Achiron A,Warfield SK,Guttmann CR,Azhari H

更新日期：2004-07-01 00:00:00