Artificial intelligence in medical imaging.

abstract：OBJECTIVE:Our purpose was to evaluate imaging findings of breast cancers according to the dominant stroma type by using kinetic curve analysis and model-based perfusion parameters from dynamic contrast-enhanced magnetic resonance imaging. METHODS:From March 2011 to September 2011, 64 cancers in 64 patients were includ...

journal_title：Magnetic resonance imaging

authors： Yim H,Kang DK,Jung YS,Jeon GS,Kim TH

更新日期：2016-01-01 00:00:00

abstract：:Merkel cell carcinoma (MCC) is a rare malignant tumor of the skin and often is diagnosed histologically as lymphoma, melanoma and even metastatic small cell carcinoma of the lung (SCCL). Classified as a neuroendocrine tumor, clinically it originates in the head and neck region and may present with metastatic disease a...

journal_title：Magnetic resonance imaging

authors： Moayed S,Maldjianb C,Adam R,Bonakdarpour A

更新日期：2000-10-01 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 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

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

更新日期：2001-06-01 00:00:00

abstract：:Current fast imaging techniques are based on gradient echo sequences with reduced flip angle excitation pulses and very short repetition times TR. Practical T2 values may be of the order of TR or longer. In this situation, a different image contrast can be obtained, depending on details of the sequence. Four essential...

journal_title：Magnetic resonance imaging

authors： van der Meulen P,Groen JP,Tinus AM,Bruntink G

更新日期：1988-07-01 00:00:00

abstract：:A magnetic resonance imaging cardiac magnetic susceptometry (MRI-CS) technique for assessing cardiac tissue iron concentration based on phase mapping was developed. Normal control subjects (n=9) and thalassemia patients (n=13) receiving long-term blood transfusion therapy underwent MRI-CS and MRI measurements of the c...

journal_title：Magnetic resonance imaging

authors： Wang ZJ,Fischer R,Chu Z,Mahoney DH Jr,Mueller BU,Muthupillai R,James EB,Krishnamurthy R,Chung T,Padua E,Vichinsky E,Harmatz P

更新日期：2010-04-01 00:00:00

abstract：:The effects of varying the inversion or excitation RF pulse flip angles on image contrast and imaging time have been investigated in IR imaging theoretically, with phantoms and with normal volunteers. Signal intensity in an IR pulse sequence as a function of excitation, inversion and refocusing pulse flip angles was c...

journal_title：Magnetic resonance imaging

authors： Vinitski S,Albert S,Mitchell DG,Tasciyan TA,Rifkin MD

更新日期：1992-01-01 00:00:00

abstract：:Dynamic contrast-enhanced magnetic resonance imaging (MRI) is widely used for measuring perfusion and blood volume, especially cerebral blood volume (CBV). In case of blood-brain barrier (BBB) disruption, the conventional techniques only partially determine the pharmacokinetic parameters of contrast medium (CM) exchan...

journal_title：Magnetic resonance imaging

authors： Lüdemann L,Hamm B,Zimmer C

更新日期：2000-12-01 00:00:00

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

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

更新日期：1999-12-01 00:00:00

abstract：:Conditions for generation of polarized RF fields in cylindrical symmetry by high order coils are presented. Whole body NMR transmitters utilizing this principle would require a current control on a certain number of loops. In the present design this is obtained by feeding each loop by an appropriate linear combination...

journal_title：Magnetic resonance imaging

authors： Sotgiu A,Gualtieri G,Passariello R

更新日期：1988-05-01 00:00:00

abstract：:A new phantom and evaluation method for experimental evaluation of 1H-magnetic resonance spectroscopy single volume localization techniques regarding signal contamination (C), defined as the part of the signal originating outside the volume of interest, is presented. The quality assessment method is based on a spheric...

journal_title：Magnetic resonance imaging

authors： Burtscher IM,Johansson E,Holtås S,Ståhlberg F

更新日期：1999-12-01 00:00:00

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

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

更新日期：1994-01-01 00:00:00

abstract：:In vivo proton and phosphorus magnetic resonance spectroscopy (MRS) studies were performed at 1.5 T on two patients (siblings) diagnosed as having a mitochondrial cytopathy. The clinical diagnosis was based on a complete battery of biochemical tests, electron microscopy and modified Gomori trichrome stain studies of m...

journal_title：Magnetic resonance imaging

authors： Narayana PA,Slopis JM,Jackson EF,Hazle JD,Kulkarni MV,Butler IJ

更新日期：1989-03-01 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：:Changes in both blood flow and blood oxygenation determine the functional MRI (fMRI) signal. In the present study factors responsible for blood oxygenation (e.g., FiO(2)) were held constant so that changes in pixel count would above all reflect changes in regional cerebral blood flow (rCBF). Continuous positive airway...

journal_title：Magnetic resonance imaging

authors： Lorenz IH,Kolbitsch C,Hörmann C,Schocke M,Kremser C,Zschiegner F,Felber S,Benzer A

更新日期：2001-01-01 00:00:00

abstract：:The specialised radiofrequency (RF) coils used in MRI such as head or surface coils can give rise to marked image intensity nonuniformities. There are two situations in which it is essential to correct this: (1) When a global intensity threshold is used to segment particular tissues; and (2) in proton density images, ...

journal_title：Magnetic resonance imaging

authors： Wicks DA,Barker GJ,Tofts PS

更新日期：1993-01-01 00:00:00

abstract：:The density driven convection phenomenon is expected to have a significant and positive role in CO2 geological storage capacity and safety. The onset and development of density-driven convective on the core scale is critical to understand the mass transfer mechanism. In this paper, laboratory experiments were conducte...

journal_title：Magnetic resonance imaging

authors： Teng Y,Jiang L,Fan Y,Liu Y,Wang D,Abudula A,Song Y

更新日期：2017-06-01 00:00:00

abstract：:The purpose of this study was to evaluate the effect of gadoxetic acid (Gd-EOB-DTPA) on measurements of liver stiffness by using magnetic resonance elastography (MRE). In this study, 104 consecutive patients (mean age, 67.7±9.4 years) underwent MRE using a 1.5-T MR scanner equipped with a cylindrical passive driver th...

journal_title：Magnetic resonance imaging

authors： Motosugi U,Ichikawa T,Sou H,Sano K,Muhi A,Ehman RL,Araki T

更新日期：2012-01-01 00:00:00

abstract：:Relaxation times estimation methods play a central role in various problems, such as magnetic resonance (MR) hardware calibration, tissue characterization, or temperature measurement. Previous studies have proposed optimization criteria to estimate the relaxation time T1 faster than with a multipoint method leading to...

journal_title：Magnetic resonance imaging

authors： Imran J,Langevin F,Saint-Jalmes H

更新日期：1999-11-01 00:00:00

abstract：:Peripheral magnetic resonance angiography (MRA) is growing in use. However, methods of performing peripheral MRA vary widely and continue to be optimized, especially for improvement in illustration of infrapopliteal arteries. The main purpose of this project was to identify imaging factors that can improve arterial vi...

journal_title：Magnetic resonance imaging

authors： Hood MN,Ho VB,Foo TK,Marcos HB,Hess SL,Choyke PL

更新日期：2002-09-01 00:00:00

abstract：OBJECTIVE:In magnetic resonance-guided breast vacuum biopsies, the contrast agent for targeting suspicious lesions can typically be applied only once during an intervention, due to the slow elimination of the gadolinium chelate from the extracellular fluid space. This study evaluated the feasibility of diffusion-weight...

journal_title：Magnetic resonance imaging

authors： Berger N,Varga Z,Frauenfelder T,Boss A

更新日期：2017-05-01 00:00:00

abstract：:The biodistribution and relative molar effectiveness of the ionic (GdCl3) and chelated (Gd-DTPA) forms of gadolinium (Gd) to enhance proton relaxation rates in rat kidney, liver and spleen were evaluated. Rats were given intravenous injections of either GdCl3 (100 mumol/kg) or Gd-DTPA (178 mumol/kg). Gd-DTPA was prima...

journal_title：Magnetic resonance imaging

authors： Barnhart JL,Kuhnert N,Bakan DA,Berk RN

更新日期：1987-01-01 00:00:00

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

authors： Sepponen RE

更新日期：1985-01-01 00:00:00

abstract：:Quantitative measures of rheumatoid arthritis (RA) disease progression can provide valuable tools for evaluation of new treatments during clinical trials. In this study, a novel multispectral (MS) MRI analysis method is presented to quantify changes in bone lesion volume (DeltaBLV) in the hands of RA patients. Image r...

journal_title：Magnetic resonance imaging

authors： Carano RA,Lynch JA,Redei J,Ostrowitzki S,Miaux Y,Zaim S,White DL,Peterfy CG,Genant HK

更新日期：2004-05-01 00:00:00

abstract：:Interventions for peripheral arterial disease should be designed to treat a physiological rather than an anatomic defect. Thus, for vascular surgeons, functional information about stenoses is as important as the anatomic one. In case of finding a stenosis by the use of magnetic resonance angiography, it would be a mat...

journal_title：Magnetic resonance imaging

authors： Mühlthaler H,Quatember B,Fraedrich G,Mühlthaler M,Pfeifer B,Greiner A,Schocke MF

更新日期：2008-10-01 00:00:00

abstract：:Functional magnetic resonance imaging (fMRI) research has shown that brain arteriovenous malformations (AVMs) lead to reorganization of cortical motor areas. Since it is known that blood oxygenation level-dependent signal in fMRI may be influenced by the hemodynamic perturbation associated with the presence of the AVM...

journal_title：Magnetic resonance imaging

authors： Caramia F,Francia A,Mainero C,Tinelli E,Palmieri MG,Colonnese C,Bozzao L,Caramia MD

更新日期：2009-12-01 00:00:00

abstract：:A new and simple method for precise determination of lateral opposed treatment portals was developed and used in 17 patients. Compared to CT, MRI led to significant changes of portals in 59% (10/17) of cases. Individual shielding blocks could be precisely designed by use of our new method. MRI is the procedure of choi...

journal_title：Magnetic resonance imaging

authors： Just M,Rösler HP,Higer HP,Kutzner J,Thelen M

更新日期：1991-01-01 00:00:00

abstract：:NMR imaging and localized 1H spectroscopy of a variety of aquatic organisms in vivo is described for the first time. The practical consideration of life support, water volume, salinity, and anesthesia are discussed and solutions presented. Such animal studies shape our understanding of physiology, biochemistry, and bi...

journal_title：Magnetic resonance imaging

authors： Blackband SJ,Stoskopf MK

更新日期：1990-01-01 00:00:00

abstract：:Resting fluctuations in arterial CO2 (a cerebral vasodilator) are believed to be an important source of low-frequency blood oxygenation level dependent (BOLD) signal fluctuations. In this study we focus on the two commonly used resting-states in functional magnetic resonance imaging experiments, eyes open and eyes clo...

journal_title：Magnetic resonance imaging

authors： Peng T,Niazy R,Payne SJ,Wise RG

更新日期：2013-04-01 00:00:00

abstract：:Non-invasive assessment of cartilage properties, specifically water content, could prove helpful in the diagnosis of early degenerative joint diseases. Transverse relaxation times T(2) of human articular cartilage (34 cartilage slices of three donors) were measured on a pixel-by-pixel basis in a clinical whole body MR...

journal_title：Magnetic resonance imaging

authors： Lüsse S,Claassen H,Gehrke T,Hassenpflug J,Schünke M,Heller M,Glüer CC

更新日期：2000-05-01 00:00:00