Interactive coronary MRI.


:The acquisition of complete three-dimensional (3D), segmented gradient-echo data sets to visualize the coronary arteries can be both time consuming and sensitive to motion, even with use of multiple breath-holding or respiratory gating. An alternate hybrid approach is demonstrated here, in which real-time interactive imaging is first used to locate an optimal oblique coronary scan plane. Then, a limited number of contiguous slices are acquired around that plane within a breath-hold with use of two-dimensional (2D) segmented gradient-echo imaging. Dual inversion nulling is used to suppress fat and myocardium. Finally, if needed, a limited reformat of the data is performed to produce images from relatively long sections of the coronaries. This approach yields relatively rapid visualization of portions of the coronary tree. Several different methods are compared for interactively moving the scan plane.


Magn Reson Med


Hardy CJ,Darrow RD,Pauly JM,Kerr AB,Dumoulin CL,Hu BS,Martin KM




Has Abstract


1998-07-01 00:00:00












  • A z-gradient array for simultaneous multi-slice excitation with a single-band RF pulse.

    abstract:PURPOSE:Multi-slice radiofrequency (RF) pulses have higher specific absorption rates, more peak RF power, and longer pulse durations than single-slice RF pulses. Gradient field design techniques using a z-gradient array are investigated for exciting multiple slices with a single-band RF pulse. THEORY AND METHODS:Two d...

    journal_title:Magnetic resonance in medicine

    pub_type: 杂志文章


    authors: Ertan K,Taraghinia S,Sadeghi A,Atalar E

    更新日期:2018-07-01 00:00:00

  • Macromolecule and water magnetization exchange modeling in articular cartilage.

    abstract::Magnetization exchange effects between the matrix macromolecules (e. g., collagen and proteoglycan) and water were examined in normal, deuterated, and proteoglycan-depleted articular cartilage. Relaxation results (T(2), T(1rho), and T(1)) suggested that a four-site exchange scheme provided an accurate model for articu...

    journal_title:Magnetic resonance in medicine

    pub_type: 杂志文章


    authors: Lattanzio PJ,Marshall KW,Damyanovich AZ,Peemoeller H

    更新日期:2000-12-01 00:00:00

  • Phase-sensitive inversion recovery for myocardial T1 mapping with motion correction and parametric fitting.

    abstract::The assessment of myocardial fibrosis and extracellular volume requires accurate estimation of myocardial T1 s. While image acquisition using the modified Look-Locker inversion recovery technique is clinically feasible for myocardial T1 mapping, respiratory motion can limit its applicability. Moreover, the conventiona...

    journal_title:Magnetic resonance in medicine

    pub_type: 杂志文章


    authors: Xue H,Greiser A,Zuehlsdorff S,Jolly MP,Guehring J,Arai AE,Kellman P

    更新日期:2013-05-01 00:00:00

  • Robust estimation of spatially variable noise fields.

    abstract::Consideration of spatially variable noise fields is becoming increasingly necessary in MRI given recent innovations in artifact identification and statistically driven image processing. Fast imaging methods enable study of difficult anatomical targets and improve image quality but also increase the spatial variability...

    journal_title:Magnetic resonance in medicine

    pub_type: 杂志文章


    authors: Landman BA,Bazin PL,Smith SA,Prince JL

    更新日期:2009-08-01 00:00:00

  • Value of a blood pool contrast agent in MR venography of the lower extremities and pelvis: preliminary results in 12 patients.

    abstract::The purpose of this study was to determine the value of a blood-pool contrast media (NC100150, Nycomed Imaging (now Amersham Health) Oslo, Norway) for evaluation of venous thrombosis of the deep veins of the pelvis and lower extremities. Twelve patients were prospectively evaluated with conventional X-ray venography (...

    journal_title:Magnetic resonance in medicine

    pub_type: 临床试验,杂志文章,随机对照试验


    authors: Aschauer M,Deutschmann HA,Stollberger R,Hausegger KA,Obernosterer A,Schöllnast H,Ebner F

    更新日期:2003-11-01 00:00:00

  • T2 accuracy on a whole-body imager.

    abstract::MR oximetry requires a T2 measurement that is accurate within 5% in vivo. Simple methods are susceptible to signal loss and tend to underestimate T2. Current methods utilize RF pulses or RF cycling patterns that prevent signal loss at each data acquisition. However, using these methods with imperfect pulses, T2 tends ...

    journal_title:Magnetic resonance in medicine

    pub_type: 杂志文章


    authors: Foltz WD,Stainsby JA,Wright GA

    更新日期:1997-11-01 00:00:00

  • Magnetic field dependence of proton relaxation rates in tissue with added Mn2+: rabbit liver and kidney.

    abstract::Since contrast in magnetic resonance imaging (MRI) is so sensitive to the magnetic relaxation rates of tissue protons, the use of paramagnetic ions to alter contrast in a tissue-specific fashion is an alluring prospect. The influence of these ions on the proton relaxation rates in homogeneous solutions is known to var...

    journal_title:Magnetic resonance in medicine

    pub_type: 杂志文章


    authors: Koenig SH,Brown RD 3rd,Goldstein EJ,Burnett KR,Wolf GL

    更新日期:1985-04-01 00:00:00

  • Arrays of mutually coupled receiver coils: theory and application.

    abstract::Specialized receiver coils having a small sensitive region can provide an improvement in SNR for MR imaging and spectroscopy, at the expense of limiting the usable field of view. This work presents a technique for designing coil arrays that allows the size and location of the sensitive region to be selected remotely. ...

    journal_title:Magnetic resonance in medicine

    pub_type: 杂志文章


    authors: Wright SM,Magin RL,Kelton JR

    更新日期:1991-01-01 00:00:00

  • Fast mapping of myocardial blood flow with MR first-pass perfusion imaging.

    abstract::Accurate and fast quantification of myocardial blood flow (MBF) with MR first-pass perfusion imaging techniques on a pixel-by-pixel basis remains difficult due to relatively long calculation times and noise-sensitive algorithms. In this study, Zierler's central volume principle was used to develop an algorithm for the...

    journal_title:Magnetic resonance in medicine

    pub_type: 杂志文章


    authors: Goldstein TA,Jerosch-Herold M,Misselwitz B,Zhang H,Gropler RJ,Zheng J

    更新日期:2008-06-01 00:00:00

  • Kinetics of avidin-induced clearance of biotinylated bimodal liposomes for improved MR molecular imaging.

    abstract::Dual labeled liposomes, carrying both paramagnetic and fluorescent lipids, were recently proposed as potent contrast agents for MR molecular imaging. These nanoparticles are coated with poly(ethylene glycol) (PEG) to increase their blood circulation half-life, which should allow extensive accumulation at the targeted ...

    journal_title:Magnetic resonance in medicine

    pub_type: 杂志文章


    authors: van Tilborg GA,Strijkers GJ,Pouget EM,Reutelingsperger CP,Sommerdijk NA,Nicolay K,Mulder WJ

    更新日期:2008-12-01 00:00:00

  • A hybrid method for more efficient channel-by-channel reconstruction with many channels.

    abstract::In MRI, imaging using receiving coil arrays with a large number of elements is an area of growing interest. With increasing channel numbers for parallel acquisition, longer reconstruction times have become a significant concern. Channel reduction techniques have been proposed to reduce the processing time of channel-b...

    journal_title:Magnetic resonance in medicine

    pub_type: 杂志文章


    authors: Huang F,Lin W,Duensing GR,Reykowski A

    更新日期:2012-03-01 00:00:00

  • Variable flip angle 3D-GRASE for high resolution fMRI at 7 tesla.

    abstract:PURPOSE:To evaluate the use of variable flip angle refocusing pulse trains in single-shot three-dimensional gradient and spin-echo (3D-GRASE) to reduce blurring and increase the spatial coverage for high spatial resolution T2 -weighted functional MRI at 7 Tesla. METHODS:Variable flip angle refocusing schemes in 3D-GRA...

    journal_title:Magnetic resonance in medicine

    pub_type: 杂志文章


    authors: Kemper VG,De Martino F,Yacoub E,Goebel R

    更新日期:2016-09-01 00:00:00

  • High-resolution 1H NMR spectroscopy in the diagnosis of breast cancer.

    abstract::Surgical specimens from 22 patients with infiltrating ductal carcinoma of the breast were analyzed by high-resolution 1H NMR spectroscopy at 80 and 300 MHz. Results were compared with those obtained from 9 benign (proliferative dysplasia without atypia) breast samples. NMR spectra at 80 MHz showed well-resolved water ...

    journal_title:Magnetic resonance in medicine

    pub_type: 杂志文章


    authors: Bradamante S,Barchiesi E,Pilotti S,Borasi G

    更新日期:1988-12-01 00:00:00

  • MRI: the development of T2 contrast with rapid field echo sequences.

    abstract::The soft tissue contrast obtained in fast imaging using rapidly repeated partial saturation sequences is usually based on differences in T1. We describe here an extension of the method which results in the development of clinically useful T2-based contrast. ...

    journal_title:Magnetic resonance in medicine

    pub_type: 杂志文章


    authors: Young IR,Payne JA,Collins AG,Bydder GM

    更新日期:1987-04-01 00:00:00

  • Orientational dependence of T2 relaxation in articular cartilage: A microscopic MRI (microMRI) study.

    abstract::The experiments reported herein are the first MRI investigations of the orientational dependence of T(2) relaxation in articular cartilage at microscopic resolution over the 360 degrees angular space. For each of six canine cartilage specimens, 48 independent T(2)-weighted proton images were acquired for 12 different ...

    journal_title:Magnetic resonance in medicine

    pub_type: 杂志文章


    authors: Xia Y,Moody JB,Alhadlaq H

    更新日期:2002-09-01 00:00:00

  • Apparent propagator anisotropy from single-shell diffusion MRI acquisitions.

    abstract:PURPOSE:The apparent propagator anisotropy (APA) is a new diffusion MRI metric that, while drawing on the benefits of the ensemble averaged propagator anisotropy (PA) compared to the fractional anisotropy (FA), can be estimated from single-shell data. THEORY AND METHODS:Computation of the full PA requires acquisition ...

    journal_title:Magnetic resonance in medicine

    pub_type: 杂志文章


    authors: Aja-Fernández S,Tristán-Vega A,Jones DK

    更新日期:2020-12-13 00:00:00

  • Passive tracking of catheters and guidewires by contrast-enhanced MR fluoroscopy.

    abstract::Passive MR tracking of catheters and guidewires is usually done by dynamically imaging a single thick slab, subtracting a baseline image, and combining the result with a previously acquired MR angiogram. In the in vitro and in vivo experiments reported here, it is demonstrated that this approach may be greatly simplif...

    journal_title:Magnetic resonance in medicine

    pub_type: 杂志文章


    authors: Bakker CJ,Bos C,Weinmann HJ

    更新日期:2001-01-01 00:00:00

  • NMR quantification of lactate production and efflux and glutamate fractional enrichment in living human prostate biopsies cultured with [1,6-13 C2 ]glucose.

    abstract:PURPOSE:Image-guided prostate biopsies are routinely acquired in the diagnosis and treatment monitoring of prostate cancer, yielding useful tissue for identifying metabolic biomarkers and therapeutic targets. We developed an optimized biopsy tissue culture protocol in combination with [1,6-13 C2 ]glucose labeling and q...

    journal_title:Magnetic resonance in medicine

    pub_type: 杂志文章


    authors: Bancroft Brown J,Sriram R,VanCriekinge M,Delos Santos R,Sun J,Delos Santos J,Tabatabai ZL,Shinohara K,Nguyen H,Peehl DM,Kurhanewicz J

    更新日期:2019-08-01 00:00:00

  • Two-site reproducibility of cerebellar and brainstem neurochemical profiles with short-echo, single-voxel MRS at 3T.

    abstract:PURPOSE:To determine whether neurochemical concentrations obtained at two MRI sites using clinical 3T scanners can be pooled when a highly optimized, nonvendor short-echo, single-voxel proton MRS pulse sequence is used in conjunction with identical calibration and quantification procedures. METHODS:A modified semi-LAS...

    journal_title:Magnetic resonance in medicine

    pub_type: 杂志文章


    authors: Deelchand DK,Adanyeguh IM,Emir UE,Nguyen TM,Valabregue R,Henry PG,Mochel F,Öz G

    更新日期:2015-05-01 00:00:00

  • Accelerated interleaved spiral-IDEAL imaging of hyperpolarized 129 Xe for parametric gas exchange mapping in humans.

    abstract:PURPOSE:To demonstrate the feasibility of mapping gas exchange with single breath-hold hyperpolarized (HP) 129 Xe in humans, acquiring parametric maps of lung physiology. The potential benefit of acceleration using parallel imaging for this application is also explored. METHODS:Six healthy volunteers were scanned with...

    journal_title:Magnetic resonance in medicine

    pub_type: 杂志文章


    authors: Zanette B,Santyr G

    更新日期:2019-09-01 00:00:00

  • Motion correction in fMRI via registration of individual slices into an anatomical volume.

    abstract::An automated retrospective image registration based on mutual information is adapted to a multislice functional magnetic resonance imaging (fMRI) acquisition protocol to provide accurate motion correction. Motion correction is performed by mapping each slice to an anatomic volume data set acquired in the same fMRI ses...

    journal_title:Magnetic resonance in medicine

    pub_type: 杂志文章


    authors: Kim B,Boes JL,Bland PH,Chenevert TL,Meyer CR

    更新日期:1999-05-01 00:00:00

  • Repeatability and variability of myocardial perfusion imaging techniques in mice: Comparison of arterial spin labeling and first-pass contrast-enhanced MRI.

    abstract:PURPOSE:Preclinical imaging of myocardial blood flow (MBF) can elucidate molecular mechanisms underlying cardiovascular disease. We compared the repeatability and variability of two methods, first-pass MRI and arterial spin labeling (ASL), for imaging MBF in mice. METHODS:Quantitative perfusion MRI in mice was perform...

    journal_title:Magnetic resonance in medicine

    pub_type: 杂志文章


    authors: Naresh NK,Chen X,Moran E,Tian Y,French BA,Epstein FH

    更新日期:2016-06-01 00:00:00

  • Intravoxel incoherent motion imaging using steady-state free precession.

    abstract::IVIM MR imaging is a method which generates images of diffusion and perfusion in vivo. Until now, intravoxel incoherent motion (IVIM) images have been obtained using spin-echo sequences with extragradient pulses, resulting in long acquisition times (typically 2 x 8 min 32 s). A new method is proposed here, using stead...

    journal_title:Magnetic resonance in medicine

    pub_type: 杂志文章


    authors: Le Bihan D

    更新日期:1988-07-01 00:00:00

  • Determination of regional brain temperature using proton magnetic resonance spectroscopy to assess brain-body temperature differences in healthy human subjects.

    abstract::Proton magnetic resonance spectroscopy ((1)H MRS) was used to determine brain temperature in healthy volunteers. Partially water-suppressed (1)H MRS data sets were acquired at 3T from four different gray matter (GM)/white matter (WM) volumes. Brain temperatures were determined from the chemical-shift difference betwee...

    journal_title:Magnetic resonance in medicine

    pub_type: 杂志文章


    authors: Childs C,Hiltunen Y,Vidyasagar R,Kauppinen RA

    更新日期:2007-01-01 00:00:00

  • Lactate isotopomer analysis by 1H NMR spectroscopy: consideration of long-range nuclear spin-spin interactions.

    abstract::Lactate is a key metabolite and its rates of cellular uptake and release, its production rates from glucose and glycogen, and its interconversion rate with pyruvate are important determinants of cellular energy production. If lactate precursors such as pyruvate and glucose are labeled appropriately with (13)C, (1)H NM...

    journal_title:Magnetic resonance in medicine

    pub_type: 杂志文章


    authors: Lloyd SG,Zeng H,Wang P,Chatham JC

    更新日期:2004-06-01 00:00:00

  • Characterization of anomalous relaxation using the time-fractional Bloch equation and multiple echo T2 *-weighted magnetic resonance imaging at 7 T.

    abstract:PURPOSE:To study the utility of fractional calculus in modeling gradient-recalled echo MRI signal decay in the normal human brain. METHODS:We solved analytically the extended time-fractional Bloch equations resulting in five model parameters, namely, the amplitude, relaxation rate, order of the time-fractional derivat...

    journal_title:Magnetic resonance in medicine

    pub_type: 杂志文章


    authors: Qin S,Liu F,Turner IW,Yu Q,Yang Q,Vegh V

    更新日期:2017-04-01 00:00:00

  • Articular cartilage deformation determined in an intact tibiofemoral joint by displacement-encoded imaging.

    abstract::This study demonstrates the in vitro displacement and strain of articular cartilage in a cyclically-compressed and intact joint using displacement-encoded imaging with stimulated echoes (DENSE) and fast spin echo (FSE). Deformation and strain fields exhibited complex and heterogeneous patterns. The displacements in th...

    journal_title:Magnetic resonance in medicine

    pub_type: 杂志文章


    authors: Chan DD,Neu CP,Hull ML

    更新日期:2009-04-01 00:00:00

  • Radiofrequency pulse design for the selective excitation of dissolved 129Xe.

    abstract:PURPOSE:To optimize radiofrequency (RF) pulses for the selective excitation of dissolved phase (129)Xe that take into account the very short T2*, while simultaneously, minimally exciting the much larger gas signal. METHODS:Numerical simulations of Shinnar le-Roux pulses and binomial coefficient composite-element pulse...

    journal_title:Magnetic resonance in medicine

    pub_type: 杂志文章


    authors: Leung G,Norquay G,Schulte RF,Wild JM

    更新日期:2015-01-01 00:00:00

  • Diffusion sensitivity of 3D-GRASE in arterial spin labeling perfusion.

    abstract:PURPOSE:To evaluate the role of true diffusion and flow-related pseudodiffusion in cerebral blood flow (CBF) quantification using arterial spin labeling (ASL) with single-shot or segmented 3D gradient and spin echo (GRASE) readouts. THEORY:The extended phase graph (EPG) algorithm, originally designed to model the effe...

    journal_title:Magnetic resonance in medicine

    pub_type: 杂志文章


    authors: He X,Wengler K,Schweitzer ME

    更新日期:2018-08-01 00:00:00

  • An automated iterative algorithm for the quantitative analysis of in vivo spectra based on the simplex optimization method.

    abstract::The success in utilizing in vivo NMR to identify and/or monitor metabolic abnormalities will be determined in large part on the reliability with which the spectral parameters of the metabolites present can be measured. For these reasons it is clear that there is a need for the development of algorithms with which to o...

    journal_title:Magnetic resonance in medicine

    pub_type: 杂志文章


    authors: Lenkinski RE,Allman T,Scheiner JD,Deming SN

    更新日期:1989-06-01 00:00:00