abstract：:In this paper the effects of reducing the flip angle of the 90-degree observation pulse in inversion recovery imaging are described and analyzed. When incorporated in an IR sequence with a short inversion time (STIR), reduction to the 90-degree pulse allows a significant shortening of the repetition time without loss ...

journal_title：Magnetic resonance imaging

authors： Bakker CJ,Witkamp TD,Janssen WM

更新日期：1991-01-01 00:00:00

abstract：:We compared the ability of magnetic resonance imaging (MRI) using a 0.064 T permanent magnet, three-phase bone scanning, and indium-labeled white blood cell (111In-WBC) scanning, to diagnose osteomyelitis. Twenty-three patients underwent biopsy. All patients were examined at presentation with all three modalities. Sen...

journal_title：Magnetic resonance imaging

authors： Williamson MR,Quenzer RW,Rosenberg RD,Meholic AJ,Eisenberg B,Espinosa MC,Hartshorne MF

更新日期：1991-01-01 00:00:00

abstract：:Radio frequency magnetic fields from 5 to 100 kHz off resonance reduce longitudinal magnetization of water in some tissues without affecting the magnetization of simple solutions (Wolff, S.D.; Balaban, R.S. Magnetization transfer contrast (MTC) and tissue water proton relaxation in vivo. Magn. Reson. Med. 10:135-144; ...

journal_title：Magnetic resonance imaging

authors： Dixon WT,Engels H,Castillo M,Sardashti M

更新日期：1990-01-01 00:00:00

abstract：:Gd-DOTA contrast enhancement of MR images was evaluated on induced mammary tumors in female rats. A single intravenous injection of the carcinogenic N-nitrosourea ENU was administered to Wistar rats; this simple treatment led to a high percentage of mammary tumors without causing death. All the induced tumors were ade...

journal_title：Magnetic resonance imaging

authors： Bonnet PA,Michel A,Fernandez JP,Cyteval C,Rifai A,Boucard M,Chapat JP,Lamarque JL

更新日期：1990-01-01 00:00:00

abstract：:A case report of trismus after a dental procedure is evaluated by MR imaging. The medial and lateral pterygoid muscles showed inflammatory changes. Etiologies of trismus are reviewed. ...

journal_title：Magnetic resonance imaging

authors： Ciacchella AP,Higgins WL

更新日期：1990-01-01 00:00:00

abstract：:Fifteen patients with liver cirrhosis and two control groups were examined. The first control group consisted of 7 healthy volunteers, and the second group of 17 patients with nonfocal liver diseases. The T1 and T2 relaxation times were calculated from signal intensities read out from a region of interest centrally lo...

journal_title：Magnetic resonance imaging

authors： Thomsen C,Christoffersen P,Henriksen O,Juhl E

更新日期：1990-01-01 00:00:00

abstract：:We studied 26 cases of abdominal aortic aneurysm with magnetic resonance imaging (MRI), computed tomography (CT), ultrasonography (US), and angiography. Data acquired were compared to those obtained at surgery. Diameter of the aneurysm was correctly defined in all cases by CT and MRI, while angiography underestimated ...

journal_title：Magnetic resonance imaging

authors： Pavone P,Di Cesare E,Di Renzi P,Marsili L,Ventura M,Spartera C,Passariello R

更新日期：1990-01-01 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：:A numerical method is applied to calculate an optimal distribution of currents in air which generate the magnetic field gradients required to spatially encode the radiofrequency signal in a NMR tomographic experiment. We compare the performances of the gradient circuits for the whole body air-core electromagnet descri...

journal_title：Magnetic resonance imaging

authors： Mustarelli P,Rudnicki M,Savini A,Savoldi F,Villa M

更新日期：1990-01-01 00:00:00

abstract：:Serious adverse reactions following the IV administration of Gd-DTPA (Magnevist, gadopenetate dimeglumine, Berlex Laboratories, Wayne, NJ), although extremely rare, can occur. As yet, there has been no published case of a severe anaphylactoid-type reaction to Gd-DTPA. ...

journal_title：Magnetic resonance imaging

authors： Weiss KL

更新日期：1990-01-01 00:00:00

abstract：:Fifty-four independent scans were performed in two volunteers covering one anatomic region in each (the brain and knee) with the purpose of ascertaining the agreement between predicted and measured signal-to-noise ratios (SNR). Systematically varied parameters were number of excitations (NEX), field of view (FOV), sec...

journal_title：Magnetic resonance imaging

authors： Owen RS,Wehrli FW

更新日期：1990-01-01 00:00:00

abstract：:Pellets of HeLa from suspension cultured cells in isotonic medium (300 mosmolar) were introduced into a Bruker CXP100 NMR spectrophotometer at 80 mHz within 5 min of the start of centrifugation. T1 and T2 times were measured within a total elapsed time of 20-25 min at 80 mHz and 37 degrees C, and averaged 1430 msec an...

journal_title：Magnetic resonance imaging

authors： Wheatley DN,Rimmington JE,Foster MA

更新日期：1990-01-01 00:00:00

abstract：:We have synthesized a surface functionalized superparamagnetic iron oxide colloid whose clearance from the vascular compartment was inhibited by asialofetuin but not fetuin. Unlike other particulate or colloidal magnetic resonance (MR) contrast agents, the agent of the current communication is not withdrawn from the v...

journal_title：Magnetic resonance imaging

authors： Josephson L,Groman EV,Menz E,Lewis JM,Bengele H

更新日期：1990-01-01 00:00:00

abstract：:The aim of this study was to establish a rapid method for in vivo quantification of a large range of flow velocities using phase information. A basic gradient-echo sequence was constructed, in which flow was encoded along the slice selection direction by variation of the amplitude of a bipolar gradient without changes...

journal_title：Magnetic resonance imaging

authors： Ståhlberg F,Mogelvang J,Thomsen C,Nordell B,Stubgaard M,Ericsson A,Sperber G,Greitz D,Larsson H,Henriksen O

更新日期：1989-11-01 00:00:00

abstract：:The polysplenia syndrome is the association of multiple spleens, situs inversus, congenital heart disease, and azygous continuation of the inferior vena cava. Magnetic resonance (MR) is a noninvasive imaging modality which can easily confirm the multiplicity of spleens, situs inversus, and identify complex congenital ...

journal_title：Magnetic resonance imaging

authors： Jelinek JS,Stuart PL,Done SL,Ghaed N,Rudd SA

更新日期：1989-11-01 00:00:00

abstract：:For a number of reasons, it is desirable to fabricate coils which, for a known current, shall produce predetermined values of the magnetic field intensity at a number of points within a nuclear magnetic resonance imager. The calculation of the magnetic field intensity at a set of points involves the integration of the...

journal_title：Magnetic resonance imaging

authors： Letcher JH

更新日期：1989-11-01 00:00:00

abstract：:The radiologic findings from 60 patients with 86 internally deranged temporomandibular joints (TMJ) upon whom sequential imaging procedures had been performed over a period of two months to ten years were analyzed and correlated with clinical, surgical (72 joints), and pathological observations. Internal derangement o...

journal_title：Magnetic resonance imaging

authors： Schellhas KP

更新日期：1989-09-01 00:00:00

abstract：:Liposomes entrapping gadolinium-DTPA (Gd-DTPA) were synthesized from 60 mole percent egg phosphatidylcholine (EPC) and 40 mole percent cholesterol or EPC alone entrapping Gd-DTPA in diameters of 100 and 200 nm. Rats bearing Morris hepatoma in their flanks were imaged by MR pre- and post-contrast with free Gd-DTPA and ...

journal_title：Magnetic resonance imaging

authors： Unger EC,MacDougall P,Cullis P,Tilcock C

更新日期：1989-07-01 00:00:00

abstract：:The relative value of two different MRI procedures for the assessment of infratentorial extension in multiple sclerosis (MS) was studied. Multislice spin-echo techniques were used overall. Procedure A consisted of parasagittal T1-weighted images (500/30) and axial T2-weighted images (2500/30, 2500/120). Procedure B co...

journal_title：Magnetic resonance imaging

authors： Van de Vyver FL,Truyen L,Gheuens J,Degryse HR,Peersman GV,Martin JJ

更新日期：1989-05-01 00:00:00

abstract：:In vivo spin-lattice relaxation times, T1, of water and lipid protons of normal and atrophic muscles were measured, using the spatially resolved spectroscopy (SPARS) sequence, in a genetic avian model of myopathy. These T1 values were compared with those of the hypertrophic muscles. Although the water T1 values of mus...

journal_title：Magnetic resonance imaging

authors： Misra LK,Narayana PA

更新日期：1989-05-01 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：:Ten patients with biopsy-proved synovial sarcoma were evaluated by magnetic resonance (MR) imaging on a 1.5-T unit. The lesions showed intermediate signal intensity on T1-weighted images and heterogeneous high signal intensity on T2-weighted images. Tumors were well-demarcated from normal tissues. Additional informati...

journal_title：Magnetic resonance imaging

authors： Mahajan H,Lorigan JG,Shirkhoda A

更新日期：1989-03-01 00:00:00

abstract：:The quantitative determination of flow velocities using inflow-outflow techniques require slice selective excitation pulses. The intensity-velocity relationship for such methods is shown to be such that flow velocities estimated using techniques which rely on an absolute calibration of the measured intensity are sensi...

journal_title：Magnetic resonance imaging

authors： Saloner D

更新日期：1989-01-01 00:00:00

abstract：:Systems investigated with NMR spectroscopy are sometimes heterogeneous with respect to chemical composition, rates of chemical exchange, and other properties influencing magnetic resonance parameters. A method was developed to spatially encode reaction kinetic information and produce NMR images sensitive to chemical e...

journal_title：Magnetic resonance imaging

authors： McFarland EW,Neuringer LJ,Kushmerick MJ

更新日期：1988-09-01 00:00:00

abstract：:Postero-anterior radiographs and magnetic resonance imaging (MRI) of the chest were performed in nine biopsy proven cases of sarcoidosis. MRI was more sensitive than a postero-anterior chest roentgenogram in detecting hilar and mediastinal adenopathy but less informative in detecting pleural and parenchymal disease. ...

journal_title：Magnetic resonance imaging

authors： Craig DA,Colletti PM,Ratto D,Gordonson JS,Raval JK,Sharma OP

更新日期：1988-09-01 00:00:00

abstract：:Fast magnetic resonance (MR) imaging provides a consistent and predictable appearance of vascular abnormalities as shown by four patients with thrombi, dissection and aneurysm. Fast MR images are obtained during breath-holding, resulting in an absence of respiratory motion artifacts. The time of MR study is much less ...

journal_title：Magnetic resonance imaging

authors： Raval B,Kulkarni M,Narayana P,Mehta S

更新日期：1988-07-01 00:00:00

abstract：:The fast Fourier flow technique offers a convenient way for extremely exact flow measurements. In combination with ECG gating, arterial flow can be studied. The total acquisition time for a single measurement is about 10 s, an ECG-gated cine sequence can be acquired in about 4 min. Fast Fourier flow can, therefore, be...

journal_title：Magnetic resonance imaging

authors： Hennig J,Mueri M,Brunner P,Friedburg H

更新日期：1988-07-01 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：: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

authors： Duerk JL,Pattany PM

更新日期：1988-05-01 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：:NMR offers, in the complex proton relaxation properties of biological tissues, a unique and potentially powerful tool of tissue characterization. The difficulties encountered so far in comparing the results of in vitro and in vivo NMR studies carried out in different laboratories inhibit NMR methodologies from fully e...

journal_title：Magnetic resonance imaging

authors： Podo F,Orr JS,Schmidt KH,Bovée WM

更新日期：1988-03-01 00:00:00

abstract：:Proton MR measurements were performed in lyophilized urine samples collected from 5 normals (N) and 5 idiopathic hypercalciuric recurrent stone formers (SF). T1 and T2 relaxation times were measured with a Bruker PC Multispec at 20 MHz and 37 degrees C in the lyophilized samples and in samples gradually rehydrated. Si...

journal_title：Magnetic resonance imaging

authors： Azoury R,Abrashkin S,Weininger J,Iaina A

更新日期：1988-01-01 00:00:00

abstract：:Disseminated osseous tuberculosis is a rare disease. This is a report of two cases of disseminated osseous tuberculosis imaged with MRI at 1.5-T, CT, plain radiography and bone scintigraphy. CT and plain radiography demonstrated either highly destructive or cystic lesions with sclerotic margins. Bone scintigraphy and ...

journal_title：Magnetic resonance imaging

authors： Quinn SF,Murray W,Prochaska J,Cochran C,Clark R

更新日期：1987-01-01 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：:The fluorine nuclear magnetic resonance spin-lattice relaxation rate (1/T1) of the perfluorochemical blood substitute perfluorotripropylamine (FTPA) is very sensitive to oxygen tension. This presents the possibility of measuring blood oxygen tension by 19F MR imaging. We obtained oxygen-sensitive 19F NMR images of the...

journal_title：Magnetic resonance imaging

authors： Fishman JE,Joseph PM,Floyd TF,Mukherji B,Sloviter HA

更新日期：1987-01-01 00:00:00

abstract：:This work discusses the effect of sampling time on noise, signal-to-noise and contrast-to-noise ratios in magnetic resonance imaging. A simple imaging experiment is performed to demonstrate the effect of sampling time on noise, confirming theoretical expectations that doubling the sampling time while decreasing the re...

journal_title：Magnetic resonance imaging

authors： Hendrick RE

更新日期：1987-01-01 00:00:00

abstract：:Percentage of lipid content of 22 adrenal cortex lesions and their water proton longitudinal relaxation time were measured in vitro at 60 MHz. Although water relaxation times obtained on benign and malignant samples overlap each other, measurements of the percentage of lipids performed on the same tissues allow us to ...

journal_title：Magnetic resonance imaging

authors： Leroy-Willig A,Roucayrol JC,Luton JP,Courtieu J,Niesenbaum N,Louvel A

更新日期：1987-01-01 00:00:00

abstract：:The effects of motion in two-dimensional Fourier transform imaging (2DFT) are considered. Specific calculations describing the case of periodic motion are presented. The results predict the commonly seen artifact of image replication, sometimes referred to as ghosting. Expressions for both position and amplitude of th...

journal_title：Magnetic resonance imaging

authors： Haacke EM,Patrick JL

更新日期：1986-01-01 00:00:00

abstract：:Phantoms for evaluation of nuclear magnetic resonance (NMR) imaging systems were made from water-based agarose gels, according to a standard procedure herein described. Copper sulfate (CuSO4) was included in the gels to further affect their proton relaxation characteristics. The proton relaxation rates of each batch o...

journal_title：Magnetic resonance imaging

authors： Mitchell MD,Kundel HL,Axel L,Joseph PM

更新日期：1986-01-01 00:00:00

abstract：:Retained sponges after laparotomy may cause a broad spectrum of clinical symptoms and present a difficult diagnostic problem. We report a case of retained surgical sponge in a dog to illustrate the MRI findings of this infrequent but important cause of postoperative complications. ...

journal_title：Magnetic resonance imaging

authors： Terrier F,Revel D,Hricak H,Feduska N

更新日期：1985-01-01 00:00:00