当前位置： SCI文献检索 > MAGNETIC RESONANCE IMAGING期刊下所有文献 > Phase gradient imaging for positive contrast generation to superparamagnetic iron oxide nanoparticle-labeled targets in magnetic resonance imaging.

Phase gradient imaging for positive contrast generation to superparamagnetic iron oxide nanoparticle-labeled targets in magnetic resonance imaging.

Abstract：

:Positive contrast imaging methods produce enhanced signal at large magnetic field gradient in magnetic resonance imaging. Several postprocessing algorithms, such as susceptibility gradient mapping and phase gradient mapping methods, have been applied for positive contrast generation to detect the cells targeted by superparamagnetic iron oxide nanoparticles. In the phase gradient mapping methods, smoothness condition has to be satisfied to keep the phase gradient unwrapped. Moreover, there has been no discussion about the truncation artifact associated with the algorithm of differentiation that is performed in k-space by the multiplication with frequency value. In this work, phase gradient methods are discussed by considering the wrapping problem when the smoothness condition is not satisfied. A region-growing unwrapping algorithm is used in the phase gradient image to solve the problem. In order to reduce the truncation artifact, a cosine function is multiplied in the k-space to eliminate the abrupt change at the boundaries. Simulation, phantom and in vivo experimental results demonstrate that the modified phase gradient mapping methods may produce improved positive contrast effects by reducing truncation or wrapping artifacts.

journal_name

Magn Reson Imaging

journal_title

Magnetic resonance imaging

authors

Zhu H,Demachi K,Sekino M

doi

10.1016/j.mri.2011.04.011

subject

Has Abstract

pub_date

2011-09-01 00:00:00

pages

891-8

issue

7

eissn

0730-725X

issn

1873-5894

pii

S0730-725X(11)00141-X

journal_volume

29

pub_type

杂志文章

相关文献

MAGNETIC RESONANCE IMAGING文献大全
  • MRI of the normal hippocampus.

    abstract：:Before it is possible to use MR imaging to investigate changes in the hippocampus in disease processes such as epilepsy and memory disorders, it is imperative that normal variations are defined. Using specific anatomic locations, we evaluated the hippocampi of 29 normal volunteers with coronal MR studies. Mild variati...

    journal_title：Magnetic resonance imaging

    pub_type： 杂志文章

    doi：10.1016/0730-725x(91)90035-k

    authors： Bronen RA,Cheung G

    更新日期：1991-01-01 00:00:00

  • Interpretation of restricted diffusion in sandstones with internal field gradients.

    abstract：:We report on experiments to characterize internal magnetic field gradients that are caused by magnetic susceptibility differences between the solid phase and the fluids filling the pore space. Our measurements focus on low-field relaxometry of brine and oil in sandstones from various reservoirs around the world. Our r...

    journal_title：Magnetic resonance imaging

    pub_type： 杂志文章

    doi：10.1016/s0730-725x(01)00287-9

    authors： Appel M,Freeman JJ,Gardner JS,Hirasaki GH,Zhang QG,Shafer JL

    更新日期：2001-04-01 00:00:00

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

    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

    pub_type： 杂志文章

    doi：10.1016/j.mri.2006.02.003

    authors： Lin W,Song HK

    更新日期：2006-07-01 00:00:00

  • Quantitative diffusion MRI using reduced field-of-view and multi-shot acquisition techniques: Validation in phantoms and prostate imaging.

    abstract：PURPOSE:To evaluate the reproducibility of quantitative diffusion measurements obtained with reduced Field of View (rFOV) and Multi-shot EPI (msEPI) acquisitions, using single-shot EPI (ssEPI) as a reference. METHODS:Diffusion phantom experiments, and prostate diffusion-weighted imaging in healthy volunteers and patie...

    journal_title：Magnetic resonance imaging

    pub_type： 杂志文章

    doi：10.1016/j.mri.2018.04.006

    authors： Zhang Y,Holmes J,Rabanillo I,Guidon A,Wells S,Hernando D

    更新日期：2018-09-01 00:00:00

  • Two-tensor model-based bootstrapping on classified tensor morphologies: estimation of uncertainty in fiber orientation and probabilistic tractography.

    abstract：:In this manuscript, fast and clinically feasible model-based bootstrapping algorithms using a geometrically constrained two-tensor diffusion model are employed for estimating uncertainty in fiber orientation. A Monte-Carlo-based tensor morphology voxel classification algorithm is initially applied using single-tensor ...

    journal_title：Magnetic resonance imaging

    pub_type： 杂志文章

    doi：10.1016/j.mri.2012.07.004

    authors： Ratnarajah N,Simmons A,Bertoni M,Hojjatoleslami A

    更新日期：2013-02-01 00:00:00

  • Off-resonance binomial preparatory pulse technique for high sensitivity MRI of H2O17.

    abstract：:H2O17 is a freely diffusible tracer and naturally occurring isotope of O16 detectable by MRI and has been shown to be useful for assessing cerebral perfusion in animal studies using direct and indirect MR detection techniques. However, earlier MR techniques are either not sensitive to changes in small concentrations o...

    journal_title：Magnetic resonance imaging

    pub_type： 杂志文章

    doi：10.1016/j.mri.2003.09.005

    authors： Sood R

    更新日期：2004-02-01 00:00:00

  • Diffusion pore imaging with generalized temporal gradient profiles.

    abstract：:In porous material research, one main interest of nuclear magnetic resonance diffusion (NMR) experiments is the determination of the shape of pores. While it has been a longstanding question if this is in principle achievable, it has been shown recently that it is indeed possible to perform NMR-based diffusion pore im...

    journal_title：Magnetic resonance imaging

    pub_type： 杂志文章

    doi：10.1016/j.mri.2013.03.027

    authors： Laun FB,Kuder TA

    更新日期：2013-09-01 00:00:00

  • Self-navigated 3D whole-heart MRA for non-enhanced surveillance of thoracic aortic dilation: A comparison to CTA.

    abstract：PURPOSE:To prospectively compare image quality and reliability of a non-contrast, self-navigated 3D whole-heart magnetic resonance angiography (MRA) sequence with contrast-enhanced computed tomography angiography (CTA) for sizing of thoracic aortic aneurysm (TAA). METHODS:Self-navigated 3D whole-heart 1.5 T MRA was pe...

    journal_title：Magnetic resonance imaging

    pub_type： 杂志文章

    doi：10.1016/j.mri.2020.12.003

    authors： Poskaite P,Pamminger M,Kranewitter C,Kremser C,Reindl M,Reiter G,Piccini D,Dumfarth J,Henninger B,Tiller C,Holzknecht M,Reinstadler SJ,Klug G,Metzler B,Mayr A

    更新日期：2021-02-01 00:00:00

  • CPMG relaxation rate dispersion in dipole fields around capillaries.

    abstract：:Transverse relaxation rates for Carr-Purcell-Meiboom-Gill (CPMG) sequences increase with inter-echo time in presence of microscopic magnetic field inhomogeneities due to nuclear spin diffusion. For a weak field approximation that includes diffusion effects, the CPMG relaxation rate shift for proton diffusion around ca...

    journal_title：Magnetic resonance imaging

    pub_type： 杂志文章

    doi：10.1016/j.mri.2016.03.016

    authors： Kurz FT,Kampf T,Buschle LR,Heiland S,Schlemmer HP,Bendszus M,Ziener CH

    更新日期：2016-09-01 00:00:00

  • A visualization study on two-phase gravity drainage in porous media by using magnetic resonance imaging.

    abstract：:Gravity drainage characteristics are important to improve our understanding of gas-liquid or liquid-liquid two-phase flow in porous media. Stable or unstable displacement fronts that controlled by the capillary force, viscous force, gravitational force, etc., are relevant features of immiscible two-phase flow. In this...

    journal_title：Magnetic resonance imaging

    pub_type： 杂志文章

    doi：10.1016/j.mri.2016.03.004

    authors： Teng Y,Liu Y,Jiang L,Song Y,Zhao J,Zhang Y,Wang D

    更新日期：2016-09-01 00:00:00

  • Investigating mobility of crude oil adsorbates on mineral surfaces by NMR.

    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

    pub_type： 杂志文章

    doi：10.1016/j.mri.2018.10.002

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

    更新日期：2019-02-01 00:00:00

  • 1H magnetic resonance spectroscopy of the normal testis: preliminary findings.

    abstract：PURPOSE:The purpose of this study was to determine the pre- and postpubertal 1H magnetic resonance spectroscopic characteristics of the normal testis to establish baseline values for further clinical studies. MATERIALS AND METHODS:The subjects consisted of male volunteers, of whom 19 were prepubertal with ages between...

    journal_title：Magnetic resonance imaging

    pub_type： 杂志文章

    doi：10.1016/j.mri.2007.06.008

    authors： Firat AK,Uğraş M,Karakaş HM,Erdem G,Kurus M,Ugras M,Celik T,Kahraman B,Doğanay S

    更新日期：2008-02-01 00:00:00

  • Sources of functional magnetic resonance imaging signal fluctuations in the human brain at rest: a 7 T study.

    abstract：:Signal fluctuations in functional magnetic resonance imaging (fMRI) can result from a number of sources that may have a neuronal, physiologic or instrumental origin. To determine the relative contribution of these sources, we recorded physiological (respiration and cardiac) signals simultaneously with fMRI in human vo...

    journal_title：Magnetic resonance imaging

    pub_type： 杂志文章

    doi：10.1016/j.mri.2009.02.004

    authors： Bianciardi M,Fukunaga M,van Gelderen P,Horovitz SG,de Zwart JA,Shmueli K,Duyn JH

    更新日期：2009-10-01 00:00:00

  • A 32-channel coil system for MR vessel wall imaging of intracranial and extracranial arteries at 3T.

    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

    pub_type： 杂志文章

    doi：10.1016/j.mri.2016.10.018

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

    更新日期：2017-02-01 00:00:00

  • Equivalent cross-relaxation rate imaging positively correlates with pathological grade and cell density of adipocytic tumors.

    abstract：OBJECTIVE:Equivalent cross-relaxation rate imaging (ECRI) is an MRI technique used to evaluate qualitative changes in protein-water interactions. We aimed to prospectively evaluate the utility of ECRI for classification of adipocytic tumors. MATERIALS AND METHODS:Institutional Review Board approval was obtained and al...

    journal_title：Magnetic resonance imaging

    pub_type： 杂志文章

    doi：10.1016/j.mri.2013.12.004

    authors： Okuda H,Matsushima S,Sugiura H,Yamada K,Hamada S,Nishida Y,Ishiguro N

    更新日期：2014-04-01 00:00:00

  • Glutamate quantification by PRESS or MEGA-PRESS: Validation, repeatability, and concordance.

    abstract：PURPOSE:While PRESS is often employed to measure glutamate concentrations, MEGA-PRESS enables simultaneous Glx (glutamate and glutamine) and GABA measurements. This study aimed to compare validation, repeatability, and concordance of different approaches for glutamate quantification at 3T to aid future studies in their...

    journal_title：Magnetic resonance imaging

    pub_type： 杂志文章

    doi：10.1016/j.mri.2017.12.029

    authors： van Veenendaal TM,Backes WH,van Bussel FCG,Edden RAE,Puts NAJ,Aldenkamp AP,Jansen JFA

    更新日期：2018-05-01 00:00:00

  • 3D Slicer as an image computing platform for the Quantitative Imaging Network.

    abstract：:Quantitative analysis has tremendous but mostly unrealized potential in healthcare to support objective and accurate interpretation of the clinical imaging. In 2008, the National Cancer Institute began building the Quantitative Imaging Network (QIN) initiative with the goal of advancing quantitative imaging in the con...

    journal_title：Magnetic resonance imaging

    pub_type： 杂志文章

    doi：10.1016/j.mri.2012.05.001

    authors： Fedorov A,Beichel R,Kalpathy-Cramer J,Finet J,Fillion-Robin JC,Pujol S,Bauer C,Jennings D,Fennessy F,Sonka M,Buatti J,Aylward S,Miller JV,Pieper S,Kikinis R

    更新日期：2012-11-01 00:00:00

  • In vivo measurement of diffusion and pseudo-diffusion in skeletal muscle at rest and after exercise.

    abstract：:To investigate whether diffusion-related compartmentalization could be observed in skeletal muscle and whether this compartmentalization was affected by exercising, attenuation curves of signal against diffusion weighting were obtained in skeletal muscle of nine healthy volunteers at rest and after an exercise. Fiftee...

    journal_title：Magnetic resonance imaging

    pub_type： 杂志文章

    doi：10.1016/0730-725x(94)00096-l

    authors： Morvan D

    更新日期：1995-01-01 00:00:00

  • Whole-brain, ultra-high spatial resolution ex vivo MRI with off-the-shelf components.

    abstract：BACKGROUND:Ultra-high spatial resolution imaging of whole, ex vivo brains provides new opportunities to understand neurological disease. Recent work has demonstrated that 100 μm isotropic resolution can reveal anatomical details that are otherwise difficult to appreciate, but relied on fabrication facilities, fabricati...

    journal_title：Magnetic resonance imaging

    pub_type： 杂志文章

    doi：10.1016/j.mri.2020.11.002

    authors： Kim S,Sakaie K,Blümcke I,Jones S,Lowe MJ

    更新日期：2021-02-01 00:00:00

  • Evaluation of a contraceptive device with MR imaging.

    abstract：:The purpose of this investigation is to evaluate the positioning and to confirm the volume concept of the Lea's Shield diaphragm utilizing MR imaging. We evaluated the device in two women, one nulliparous and one multiparous. We were able to comprehensively evaluate the device in both patients and answer all questions...

    journal_title：Magnetic resonance imaging

    pub_type： 杂志文章

    doi：10.1016/s0730-725x(01)00385-x

    authors： Maldjian C,Pelosi MA 2nd,Pelosi MA 3rd,Adam R

    更新日期：2001-06-01 00:00:00

  • In vitro experiments on ICOSA6 4D flow MRI measurement for the quantification of velocity and turbulence parameters.

    abstract：PURPOSE:To perform comprehensive in vitro experiments using six-directional icosahedral flow encoding (ICOSA6) 4D flow magnetic resonance imaging (MRI) under various scan conditions to analyze the robustness of velocity and turbulence quantification. MATERIALS AND METHODS:In vitro flow phantoms with steady flow rates ...

    journal_title：Magnetic resonance imaging

    pub_type： 杂志文章

    doi：10.1016/j.mri.2020.06.020

    authors： Ha H,Park KJ,Dyverfeldt P,Ebbers T,Yang DH

    更新日期：2020-10-01 00:00:00

  • Magnetization transfer of water T(2) relaxation components in human brain: implications for T(2)-based segmentation of spectroscopic volumes.

    abstract：:Biexponential T(2) relaxation of the localized water signal can be used for segmentation of spectroscopic volumes. To assess the specificity of the components an iterative relaxation measurement of the localized water signal (STEAM, 12 echo times, geometric spacing from 30 ms to 2000 ms) was combined with magnetizatio...

    journal_title：Magnetic resonance imaging

    pub_type： 杂志文章

    doi：10.1016/s0730-725x(01)00396-4

    authors： Helms G,Piringer A

    更新日期：2001-07-01 00:00:00

  • Imaging of HDR brachytherapy dose distributions using NMR Fricke-gelatin dosimetry.

    abstract：:The application of NMR Fricke-gelatin dosimetry to the imaging of dose distributions around high dose rate (HDR) radioactive Ir-192 seeds in brachytherapy is presented. The duration of the irradiations required to give changes of the Fricke-gelatin NMR characteristics, which were readily detected by the magnetic reson...

    journal_title：Magnetic resonance imaging

    pub_type： 杂志文章

    doi：10.1016/0730-725x(94)92031-1

    authors： Schreiner LJ,Crooks I,Evans MD,Keller BM,Parker WA

    更新日期：1994-01-01 00:00:00

  • Diffusion-weighted MRI and MR- volumetry--in the evaluation of tumor response after preoperative chemoradiotherapy in patients with locally advanced rectal cancer.

    abstract：PURPOSE:To determine the diagnostic performance of diffusion-weighted MRI and MR volumetry for the assessment of tumor response after preoperative chemoradiotherapy (CRT) in patients with locally advanced rectal cancer. MATERIALS AND METHODS:Forty-three patients with rectal cancer who underwent preoperative CRT were p...

    journal_title：Magnetic resonance imaging

    pub_type： 杂志文章

    doi：10.1016/j.mri.2014.08.041

    authors： Birlik B,Obuz F,Elibol FD,Celik AO,Sokmen S,Terzi C,Sagol O,Sarioglu S,Gorken I,Oztop I

    更新日期：2015-02-01 00:00:00

  • Mri measurements of T1, T2 and D for gels undergoing volume phase transition.

    abstract：:Gels consist of crosslinked polymer network swollen in solvent. The network of flexible long-chain molecules traps the liquid medium they are immersed in. Some gels undergo abrupt volume change, a phase transition process, by swelling-shrinking in response to external stimuli changes in solvent composition, temperatur...

    journal_title：Magnetic resonance imaging

    pub_type： 杂志文章

    doi：10.1016/s0730-725x(02)00639-2

    authors： Yung KT

    更新日期：2003-02-01 00:00:00

  • Assessing image artifacts from radiotherapy electromagnetic transponders with metal-artifact reduction imaging.

    abstract：:Image artifacts due to 14 gauge radiotherapy electromagnetic (EM) transponders were assessed on conventional spin echo images, and corrected using metal artifact reduction techniques: high bandwidth, view angle tilting (VAT), and slice encoding for metal artifact correction (SEMAC). Large areas of signal loss and/or p...

    journal_title：Magnetic resonance imaging

    pub_type： 杂志文章

    doi：10.1016/j.mri.2019.02.005

    authors： Bergen RV,Ryner L

    更新日期：2019-06-01 00:00:00

  • A NMR characterisation of a banded sandstone.

    abstract：:1H-nuclear magnetic resonance (NMR) measurements have been carried out on a banded sandstone to investigate the effects of structural inhomogeneities on the fluid dynamics of the sample as a whole. The results obtained from average propagator measurements (the probability of a displacement z in a time delta or P delta...

    journal_title：Magnetic resonance imaging

    pub_type： 杂志文章

    doi：10.1016/s0730-725x(98)00043-5

    authors： Bolam AC,Packer KJ

    更新日期：1998-06-01 00:00:00

  • The uptake of Mn-DPDP by hepatocytes is not mediated by the facilitated transport of pyridoxine.

    abstract：:Manganese-dipyridoxal diphosphate (Mn-DPDP) is a liver-selective contrast agent selectively taken up by the hepatocytes. Because of the analogy of structure with pyridoxine (vitamin B6), it was previously suggested that this compound can be selectively taken up by the facilitated transport of vitamers B6. To understan...

    journal_title：Magnetic resonance imaging

    pub_type： 杂志文章

    doi：10.1016/s0730-725x(96)00140-3

    authors： Gallez B,Baudelet C,Adline J,Charbon V,Lambert DM

    更新日期：1996-01-01 00:00:00

  • The effects of changing water content, relaxation times, and tissue contrast on tissue segmentation and measures of cortical anatomy in MR images.

    abstract：:Water content is the dominant chemical compound in the brain and it is the primary determinant of tissue contrast in magnetic resonance (MR) images. Water content varies greatly between individuals, and it changes dramatically over time from birth through senescence of the human life span. We hypothesize that the effe...

    journal_title：Magnetic resonance imaging

    pub_type： 杂志文章

    doi：10.1016/j.mri.2013.07.017

    authors： Bansal R,Hao X,Liu F,Xu D,Liu J,Peterson BS

    更新日期：2013-12-01 00:00:00

  • Using nine degrees-of-freedom registration to correct for changes in voxel size in serial MRI studies.

    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

    pub_type： 杂志文章

    doi：10.1016/j.mri.2004.01.057

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

    更新日期：2004-09-01 00:00:00