Magnetic resonance

Hình cộng hưởng từ (MRI/ Magnetic resonance imaging) • Hình cộng hưởng từ hạt nhân (NMRI/ Nuclear magnetic resonance imaging) .Lịch sử MRI 1940: Felix Block+ Edward Furcell 1971: Raymond Damadian 1972: Hounsfield- CT. 1973: Paul C Lauterbur thu hình ảnh NMR (của mẫu nước). 1977: Damadian thu được hình ảnh NMR cơ thể

80p socolanong 23-04-2012 137 29   Download

Bài giảng Electrical and electronic principles - Chương 5 trình bày những nội dung chính sau: Magnetically coupled circuits, transformer, resonance. Mời các bạn cùng tham khảo để biết thêm các nội dung chi tiết.

22p nhanmotchut_1 04-10-2016 57 2   Download

Lecture Physics A2: Nuclear physics - PhD. Pham Tan Thi present the content fundamentals of atom and nuclei, nuclides and isotopes, magnetic moments, NMR and magnetic resonance imaging, stable nuclei and unstable nuclei,...

24p xusong 21-07-2021 33 3   Download

Practical questions put forward by clinicians in the past have been researched and settled in the thesis. The AD diagnosis is completely based on clinics and the implementation of clinical tests for the diagnosis work depends on assessors’ subjectivity. Therefore, the development of MRI techniques shall help clinicians make diagnosis more quickly and objectively.

27p closefriend09 16-11-2021 32 4   Download

For the above reasons, the topic: "Studying clinical characteristics, MRI images and efficiency of methylprednisolon acetat epidural injection method in patients with cervical disc herniation." aims to: Review clinical features and magnetic resonance imaging, in patients with cervical disc herniation. Evaluate the treatment effectiveness and safety of epidural acetyl methylprednisolon injection method in patients with cervical disc herniation.

31p petsematary 02-06-2021 24 4   Download

To study the value of magnetic resonance imaging in the the diagnosis of main bile duct stones. To evaluate the results of laparoscopic surgery and cholangioscopic lithotripsy through choledocho-cutaneous channel in the treatment of main bile duct stones.

28p kequaidan12 03-06-2021 29 2   Download

Studying on charactistics of 3.0 Tesla magnetic resonance imaging in evaluating some shoulder joint injuries lesions due to trauma. Comment on the value of magnetic resonance and magnetic resonance arthrography in the diagnosis of traumatic shoulder joint injuries compared with surgery.

31p kequaidan12 03-06-2021 32 4   Download

Influence of substitution of 3d metals for Mn on properties of La0.67Ca0.33Mn0.9 TM0.1O3 (TM = Fe, Co, Ni) compounds was studied. Ferromagnetic – paramagnetic and metals – insulator transitions were significantly affected by Mn-site substitution. However, no observable difference was found in their crystal structure from X-ray diffraction analysis. At room temperature the structure characterization of these compounds gave the single phase and structure is the distortion orthorhombic cell with space group symmetry Pnma.

12p 12120609 01-06-2020 14 2   Download

N-Heterocyclic carbenes are widely used in organic reactions and coordination chemistry. In the present study, 2,3-dihydro-1,3-diisopropyl-4,5-dimethylimidazol-2-ylidene (1) is reacted with diphenyl disulfide, methyl phenyl disulfide, and bis(methylsulfonyl)methane to yield target compounds 5, 6, and 7 respectively.

6p tocectocec 25-05-2020 8 0   Download

The goad of the thesis is to build the manufacture process of nano-sized magnetic fluids based on iron oxide (uniform particle size and high magnetic saturation) with stable technology; Characteristic research of magnetic properties of magnetic nanoparticles; assessment of toxicity and test of effects on cells, aiming to make contrast medicine in imaging diagnosis by magnetic resonance imaging (MRI), application on accurately identifying cancer.

28p xacxuoc4321 08-07-2019 45 5   Download

Phần 5 trình bày một số phương pháp đặc biệt như: Phương pháp đo góc nghiêng và phương vị của vỉa (Dipmeter), phương pháp quét ảnh thành hệ FMI (Fullbore Formation Microimager), phương pháp cộng hưởng từ hạt nhân NMR (Nuclear Magnetic Resonance). Mời các bạn cùng tham khảo.

14p tangtuy05 25-03-2016 97 12   Download

In Design of high density transformers for high frequency high power converters, the abovementioned issues of high-frequency transformers are explored, particularly in regards to high-power converter applications. Loss calculations accommodating resonant operating waveform and Litz wire windings are explored. Leakage inductance modeling for large-number-of-stand Litz wire windings is proposed. The optimal design procedure based on the models is developed.

175p khoaicuto 19-03-2015 55 6   Download

A system such as a nucleus may consist of many particles coupled together so that in any given state, the nucleus possesses a total magnetic moment  and a total angular momentum J. Two vectors may be taken as parallel.

14p sakuraphuong 03-06-2013 53 2   Download

Chụp cộng hưởng từ hay MRI (Magnetic Resonance Imaging) là một kỹ thuật chẩn đoán y khoa tạo ra hình ảnh giải phẫu của cơ thể nhờ sử dụng từ trường và sóng radio. Nguyên lý cộng hưởng từ hạt nhân được Felix Block và Edward Puroel phát hiện vào năm 1946, cộng hưởng từ được ứng dụng rộng rãi từ năm 1950. Năm 1952, 2 nhà vật lý Felix Block và Edward Puroell được tra giải Nobel Vật lý nhờ sự phát hiện và ứng dụng cộng hưởng từ. Năm 1980, chiếc máy cộng hưởng từ đầu tiên trên thế giới được đưa vào hoạt động...

29p vubangbk_cap 30-05-2013 726 195   Download

The solution structure of a synthetic mutant type I antifreeze protein (AFP I) was determined in aqueous solution at pH 7.0 using nuclear magnetic resonance (NMR) spectroscopy. The mutations comprised the replacement of the four Thr residues by Val and the introduction of two additional Lys-Glu salt bridges. The antifreeze activity of this mutant peptide, VVVV2KE, has been previously shown to be similar to that of the wild type protein, HPLC6 (defined here as TTTT).

8p research12 01-06-2013 36 4   Download

The osmoregulated periplasmic glucans (OPGs) produced byRhodobacter sphaeroides, a free-living organism, were isolated by trichloracetic acid treatment and gel permeation chromatography. Compounds obtained were characterized by compositional analysis, matrix-assisted laser desorption ionization mass spectrometry and nuclear magnetic resonance.R. sphaeroidespredominantly synthesizes acyclic glucan containing 18 glucose residues that canbe substituted by one to seven succinyl esters residues at the C6position of some of the glucose residues, and by one or two acetyl resi-dues....

9p research12 29-04-2013 38 1   Download

The purified membrane-bound [NiFe]-hydrogenase from Methanosarcina barkeriwas studied with electron para-magnetic resonance (EPR) focusing on the properties of the iron–sulphur clusters. TheEPRspectra showed signals from threedifferent [4Fe)4S] clusters.Twoof the clusters couldbe reduced under 101 kPa of H2, whereas the third cluster was only partially reduced.

11p tumor12 22-04-2013 38 3   Download

The lipopolysaccharide (LPS) ofChlamydia trachomatis serotype E was isolated from tissue culture-grown element-ary bodies and analyzed structurally by mass spectrometry and 1 H, 13 Cand31 P nuclear magnetic resonance. The LPS is composed of the same pentasaccharide bisphosphate aKdo-(2–8)-aKdo-(2–4)-aKdo-(2–6)-bGlcN-4P-(1–6)-aGlcN-1P (Kdo is 3-deoxy-a-D-manno-oct-2-ulosonic acid) as reported forC. trachomatisserotype L2[Rund,S.,Lind-ner,B.,Brade,H. and Holst,O. (1999)J. Biol. Chem.274, 16819–16824].

11p tumor12 20-04-2013 39 4   Download

Magnetic resonance spectroscopy studies are often carried out to provide metabolic information on tumour cell metabolism, aiming for increased knowledge for use in anti-cancer treatments. Accordingly, the presence of intense lipid signals in tumour cells has been the subject of many studies aiming to obtain further insight on the reaction of cancer cells to external agents that eventually cause cell death.

14p vinaphone15 27-02-2013 30 3   Download

 NMR in solids, like solution-state, relies on the behavior of nuclear spin energy levels in a magnetic field. However, the interactions that affect NMR spectra act differently.  In liquids, molecules reorient and diffuse quickly, leading to narrow isotropic resonances.  In solids, the fixed orientation of individual crystallites leads to a range of resonance frequencies for anisotropic interactions.

14p qdung92ct 03-07-2012 82 5   Download