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


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 GRE EPI and IR-prepped GRE sequences (SAR: 0.42 and 0.39 W/kg, respectively), and the high-SAR 4-echo RF spin echo (SAR: 2.9 W/kg). Fluoroptic thermometry was used to directly measure RF-related heating at the DBS electrodes, and at the implantable pulse generator (IPG). For reference the measurements were repeated in the same pig at 1.5 T and, at both field strengths, in a phantom. RESULTS:At 3.0T, the maximal temperature elevations at DBS electrodes were 0.46 °C and 2.3 °C, for the low- and high-SAR sequences, respectively. No heating was observed on the implanted IPG during any of the measurements. Measurements of in vivo heating differed from those obtained in the phantom. CONCLUSION:The 3.0-T MRI using GRE EPI and IR-prepped GRE sequences resulted in local temperature elevations at DBS electrodes of no more than 0.46 °C. Although no extrapolation should be made to human exams and much further study will be needed, these preliminary data are encouraging for the future use 3.0-T MRI in patients with DBS.


Magn Reson Imaging


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




Has Abstract


2013-06-01 00:00:00














  • Evaluation of algorithms for analysis of NMR relaxation decay curves.

    abstract::Quantitative processing of NMR relaxation images depends on the characteristics of the used fitting algorithm. Therefore several common fitting algorithms are compared for decay curves with low signal-to-noise ratios. The use of magnitude data yields a non-zero base line, and is shown to result in an overestimation of...

    journal_title:Magnetic resonance imaging

    pub_type: 杂志文章


    authors: van der Weerd L,Vergeldt FJ,Adrie de Jager P,Van As H

    更新日期:2000-11-01 00:00:00

  • Probe efficiency improvement with remote and transmission line tuning and matching.

    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

    pub_type: 杂志文章


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

    更新日期:1999-09-01 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


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

    更新日期:2013-12-01 00:00:00

  • A deep learning approach to estimation of subject-level bias and variance in high angular resolution diffusion imaging.

    abstract::The ability to evaluate empirical diffusion MRI acquisitions for quality and to correct the resulting imaging metrics allows for improved inference and increased replicability. Previous work has shown promise for estimation of bias and variance of generalized fractional anisotropy (GFA) but comes at the price of compu...

    journal_title:Magnetic resonance imaging

    pub_type: 杂志文章


    authors: Hainline AE,Nath V,Parvathaneni P,Schilling KG,Blaber JA,Anderson AW,Kang H,Landman BA

    更新日期:2019-06-01 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

  • 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


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

    更新日期:2019-02-01 00:00:00

  • High-resolution MR venography of cerebral arteriovenous malformations.

    abstract::The purpose of this study was to evaluate the diagnostic potential of a high-resolution magnetic resonance (MR) venography technique in patients with cerebral arteriovenous malformations (AVMs). A high-resolution 3D gradient echo sequence was used with a long echo time TE to obtain venous information down to sub-pixel...

    journal_title:Magnetic resonance imaging

    pub_type: 杂志文章


    authors: Essig M,Reichenbach JR,Schad LR,Schoenberg SO,Debus J,Kaiser WA

    更新日期:1999-12-01 00:00:00

  • MR imaging of late onset orbital rhabdomyosarcoma with intracranial extension.

    abstract::Today, patients with alveolar rhabdomyosarcoma have a favorable prognosis with a survival rate of more than 80%, due to modern radiotherapy. However, those patients with secondary meningeal involvement are still afflicted with a mortality rate of 90% unless a different therapeutic approach is taken. We report a case o...

    journal_title:Magnetic resonance imaging

    pub_type: 杂志文章


    authors: Judmaier W,Birbamer G,Buchberger W,Mihatsch T,Lener M,Felber S

    更新日期:1993-01-01 00:00:00

  • Chemical exchange saturation transfer MR imaging of articular cartilage glycosaminoglycans at 3 T: Accuracy of B0 Field Inhomogeneity corrections with gradient echo method.

    abstract::Glycosaminoglycan Chemical Exchange Saturation Transfer (gagCEST) is an important molecular MRI methodology developed to assess changes in cartilage GAG concentrations. The correction for B0 field inhomogeneity is technically crucial in gagCEST imaging. This study evaluates the accuracy of the B0 estimation determined...

    journal_title:Magnetic resonance imaging

    pub_type: 杂志文章


    authors: Wei W,Jia G,Flanigan D,Zhou J,Knopp MV

    更新日期:2014-01-01 00:00:00

  • 7T CEST MRI: A potential imaging tool for the assessment of tumor grade and cell proliferation in breast cancer.

    abstract:OBJECTIVES:To investigate the feasibility of chemical exchange saturation transfer (CEST) MRI in patients with breast carcinomas and possible correlations between magnetization transfer asymmetry (MTRasym) values and histological features, such as tumor grade and the Ki-67 proliferation index. MATERIALS AND METHODS:Ni...

    journal_title:Magnetic resonance imaging

    pub_type: 杂志文章


    authors: Zaric O,Farr A,Poblador Rodriguez E,Mlynarik V,Bogner W,Gruber S,Asseryanis E,Singer CF,Trattnig S

    更新日期:2019-06-01 00:00:00

  • Velocity distribution of slow fluid flows in Bentheimer sandstone: an NMRI and propagator study.

    abstract::This work addresses the special problems of measuring flow velocity distributions in rock by NMR methods. Specifically, these problems are to measure very slow flows as well as flows in the presence of background magnetic field gradients caused by heterogeneities of the rock. We modify a stimulated echo sequence for u...

    journal_title:Magnetic resonance imaging

    pub_type: 杂志文章


    authors: Waggoner RA,Fukushima E

    更新日期:1996-01-01 00:00:00

  • Adaptive segmentation of magnetic resonance images with intensity inhomogeneity using level set method.

    abstract::It is a big challenge to segment magnetic resonance (MR) images with intensity inhomogeneity. The widely used segmentation algorithms are region based, which mostly rely on the intensity homogeneity, and could bring inaccurate results. In this paper, we propose a novel region-based active contour model in a variationa...

    journal_title:Magnetic resonance imaging

    pub_type: 杂志文章


    authors: Liu L,Zhang Q,Wu M,Li W,Shang F

    更新日期:2013-05-01 00:00:00

  • In-plane flow velocity quantification along the phase encoding axis in MRI.

    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

    pub_type: 杂志文章


    authors: Duerk JL,Pattany PM

    更新日期:1988-05-01 00:00:00

  • A new diagnostic approach to vascular rings and pulmonary slings: the role of MRI.

    abstract:UNLABELLED:The conventional diagnostic work-up of a patient suspected of having a vascular cause for stridor, or dysphagia, includes esophagography and bronchoscopy to delineate the abnormal structure without imaging the structure itself. Cine-angiography is regarded as the golden standard, but is not routinely perform...

    journal_title:Magnetic resonance imaging

    pub_type: 杂志文章


    authors: Beekman RP,Hazekamp MG,Sobotka MA,Meijboom EJ,de Roos A,Staalman CR,Beek FJ,Ottenkamp J

    更新日期:1998-01-01 00:00:00

  • Effects of spatial smoothing on fMRI group inferences.

    abstract::The analysis of functional magnetic resonance imaging (fMRI) data involves multiple stages of data pre-processing before the activation can be statistically detected. Spatial smoothing is a very common pre-processing step in the analysis of functional brain imaging data. This study presents a broad perspective on the ...

    journal_title:Magnetic resonance imaging

    pub_type: 杂志文章


    authors: Mikl M,Marecek R,Hlustík P,Pavlicová M,Drastich A,Chlebus P,Brázdil M,Krupa P

    更新日期:2008-05-01 00:00:00

  • Imaging focal reperfusion injury following global ischemia with diffusion-weighted magnetic resonance imaging and 1H-magnetic resonance spectroscopy.

    abstract::The purpose of the study was to determine whether diffusion-weighted magnetic resonance imaging (DWI) could identify focal lesions that develop in ischemia-sensitive cerebral tissues during reperfusion following global brain ischemia. Localized 1H-Magnetic Resonance Spectroscopy (1H-MRS) measurements were also obtaine...

    journal_title:Magnetic resonance imaging

    pub_type: 杂志文章


    authors: Bizzi A,Righini A,Turner R,Le Bihan D,Bockhorst KH,Alger JR

    更新日期:1996-01-01 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

  • Pure uterine lipoma.

    abstract::Lipomatous tumors of the uterus are unusual, benign neoplasms seen in postmenopausal women. Although many of the mixed-type cases such as lipoleiomyoma and fibrolipoma have been reported, pure uterine lipomas are extremely rare. In the literature, a few cases with pure uterine lipoma have been reported. We first prese...

    journal_title:Magnetic resonance imaging

    pub_type: 杂志文章


    authors: Erdem G,Celik O,Karakas HM,Alkan A,Hascalik S

    更新日期:2007-10-01 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


    authors: Lin W,Song HK

    更新日期:2006-07-01 00:00:00

  • Brain glioma growth model using reaction-diffusion equation with viscous stress tensor on brain MR images.

    abstract::In this paper, a new reaction-diffusion model with viscous stress tensor is proposed for modeling the diffusion and invasion of brain glioma cells, which is based on the model in Yuan J.J., Liu L., Hu Q.M. Mathematical modeling of brain glioma growth using modified reaction-diffusion equation on brain MR images. Compu...

    journal_title:Magnetic resonance imaging

    pub_type: 杂志文章


    authors: Yuan J,Liu L

    更新日期:2016-02-01 00:00:00

  • Accuracy and precision of quantitative DCE-MRI parameters: How should one estimate contrast concentration?

    abstract:INTRODUCTION:Pharmacokinetic parameters derived from dynamic contrast-enhanced MRI (DCE-MRI) data are sensitive to acquisition and post-processing techniques, which makes it difficult to compare results obtained using different methods. In particular, one of the most important factors affecting estimation of model para...

    journal_title:Magnetic resonance imaging

    pub_type: 杂志文章


    authors: Wake N,Chandarana H,Rusinek H,Fujimoto K,Moy L,Sodickson DK,Kim SG

    更新日期:2018-10-01 00:00:00

  • Biliary cystadenocarcinoma: seven year follow-up and the role of MRI and MRCP.

    abstract::Biliary cystadenomas and their malignant counterparts, biliary cystadenocarcinomas, are rare cystic tumors that arise from hepatobiliary epithelium. Ultrasound (US) and computed tomography (CT) are the initial imaging modalities used for the evaluation of biliary cystic tumors, but are not specific. MRI and MRCP, beca...

    journal_title:Magnetic resonance imaging

    pub_type: 杂志文章


    authors: Williams DM,Vitellas KM,Sheafor D

    更新日期:2001-11-01 00:00:00

  • A flexible 9-channel coil array for fast 3D MR thermometry in MR-guided high-intensity focused ultrasound (HIFU) studies on rabbits at 3 T.

    abstract::Signal-to-noise ratio (SNR) is a critical factor in MR-guided high-intensity focused ultrasound (HIFU) for local heating, which can affect the accuracy of temperature measurement. In order to achieve high SNR and higher temporal resolution, dedicated coil arrays for MR-guided HIFU applications need to be developed. In...

    journal_title:Magnetic resonance imaging

    pub_type: 杂志文章


    authors: Chen Q,Li Y,Jiang R,Zou C,Tie C,Wen J,Yang X,Zhang X,Liu X,Zheng H

    更新日期:2020-01-01 00:00:00

  • Tracing neural circuits in vivo with Mn-enhanced MRI.

    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

    pub_type: 杂志文章


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

    更新日期:2006-05-01 00:00:00

  • Voxelwise analysis of diffusion MRI of cervical spinal cord using tract-based spatial statistics.

    abstract::Robust voxelwise analysis using tract-based spatial statistics (TBSS) together with permutation statistical method is standardly used in analyzing diffusion tensor imaging (DTI) of brain. A similar analytical method could be useful when studying DTI of cervical spinal cord. Based on anatomical data of sixty-four healt...

    journal_title:Magnetic resonance imaging

    pub_type: 杂志文章


    authors: Dostál M,Keřkovský M,Staffa E,Bednařík J,Šprláková-Puková A,Mechl M

    更新日期:2020-11-01 00:00:00

  • Fully automated contour detection of the ascending aorta in cardiac 2D phase-contrast MRI.

    abstract:PURPOSE:In this study we proposed a fully automated method for localizing and segmenting the ascending aortic lumen with phase-contrast magnetic resonance imaging (PC-MRI). MATERIAL AND METHODS:Twenty-five phase-contrast series were randomly selected out of a large population dataset of patients whose cardiac MRI exam...

    journal_title:Magnetic resonance imaging

    pub_type: 杂志文章


    authors: Codari M,Scarabello M,Secchi F,Sforza C,Baselli G,Sardanelli F

    更新日期:2018-04-01 00:00:00

  • Functional magnetic resonance cholangiography with Gd-EOB-DTPA: a study in healthy volunteers.

    abstract:PURPOSE:To describe the patterns of bile distribution in the biliary tree, duodenum, jejunum, and stomach, and to determine the gallbladder ejection fraction (GBEF) by using functional magnetic resonance cholangiography (MRC) with gadolinium-ethoxybenzyl-diethylenetriamine penta-acetic acid (Gd-EOB-DTPA) in healthy vol...

    journal_title:Magnetic resonance imaging

    pub_type: 临床试验,杂志文章


    authors: Lee SW,Cha SH,Chung HH,Kim KH,Yeom SK,Seo BK,Je BK,Kim BH

    更新日期:2014-05-01 00:00:00

  • Spatial normalization, bulk motion correction and coregistration for functional magnetic resonance imaging of the human cervical spinal cord and brainstem.

    abstract::Functional magnetic resonance imaging (fMRI) of the cortex is a powerful tool for neuroscience research, and its use has been extended into the brainstem and spinal cord as well. However, there are significant technical challenges with extrapolating the developments that have been achieved in the cortex to their use i...

    journal_title:Magnetic resonance imaging

    pub_type: 杂志文章


    authors: Stroman PW,Figley CR,Cahill CM

    更新日期:2008-07-01 00:00:00

  • Carotid plaque high-resolution MRI at 3 T: evaluation of a new imaging score for symptomatic plaque assessment.

    abstract:PURPOSE:To assess the sensitivity and specificity of intra-plaque hemorrhage (IPH), large lipid-rich necrotic core (LR-NC) and ulceration or cap rupture (UCR) for symptomatic carotid plaque characterization and to evaluate a new imaging score [Hemorrhage, Ulceration or cap rupture, Lipid-rich necrotic Core (HULC) score...

    journal_title:Magnetic resonance imaging

    pub_type: 杂志文章


    authors: Gury-Paquet L,Millon A,Salami F,Cernicanu A,Scoazec JY,Douek P,Boussel L

    更新日期:2012-12-01 00:00:00

  • Intracranial vascular feature changes in time of flight MR angiography in patients undergoing carotid revascularization surgery.

    abstract:PURPOSE:To characterize the intracranial vascular features extracted from time of flight (TOF) images and their changes from baseline to follow-up in patients undergoing carotid revascularization, using arterial spin labeling (ASL) cerebral blood flow (CBF) measurement as a reference. METHODS:In this retrospective stu...

    journal_title:Magnetic resonance imaging

    pub_type: 杂志文章


    authors: Chen Z,Chen L,Shirakawa M,Liu W,Ortega D,Chen J,Balu N,Trouard T,Hatsukami TS,Zhou W,Yuan C

    更新日期:2021-01-01 00:00:00