نتایج جستجو برای: nuclear magnetic resonance technology

تعداد نتایج: 1066262  

Journal: :Bulletin of Science and Practice 2019

Journal: :Journal of physics 2022

Abstract Superconducting joints (SJs) are essential materials for the development of modern technology, which is widely used in Nuclear Magnetic Resonance (NMR), Imaging (MRI), and other fields. This paper introduces preparation method low-temperature SJs, compares their characteristics advantages, measurement small resistance most important application SJs.

Journal: :Magnetic resonance in medicine 2011
Christopher M Collins Zhangwei Wang

Radiofrequency magnetic fields are critical to nuclear excitation and signal reception in magnetic resonance imaging. The interactions between these fields and human tissues in anatomical geometries results in a variety of effects regarding image integrity and safety of the human subject. In recent decades, numerical methods of calculation have been used increasingly to understand the effects o...

2012
Sheen-Woo Lee Sang-Hoon Lee Sandip Biswal

Molecular imaging has undergone an explosive advancement in recent years, due to the tremendous research efforts made to understand and visualize biological processes. Molecular imaging by definition assesses cellular and molecular processes in living subjects, with the targets of following metabolic, genomic, and proteomic events. Furthermore, reporter gene imaging plays a central role in this...

2015
Jonathan P. King Keunhong Jeong Christophoros C. Vassiliou Chang S. Shin Ralph H. Page Claudia E. Avalos Hai-Jing Wang Alexander Pines

Low detection sensitivity stemming from the weak polarization of nuclear spins is a primary limitation of magnetic resonance spectroscopy and imaging. Methods have been developed to enhance nuclear spin polarization but they typically require high magnetic fields, cryogenic temperatures or sample transfer between magnets. Here we report bulk, room-temperature hyperpolarization of (13)C nuclear ...

Journal: :مجله دانشکده پزشکی دانشگاه علوم پزشکی تهران 0
عباس تکاور a takavar

basic physical principles of nuclear magnetic resonance imaging (n.m.r.i), a nonionizing medical imaging technique, are described. principles of nmri with other conventional imaging methods, ie, isotope scanning, ultrasonography and radiography have been compared. t1 and t2 and spin density (s.d.) factors and different image construction techniques based on their different combinations is discu...

2014
Yuichiro Matsuzaki Hirotaka Tanaka

We theoretically propose a scheme for verification of quantum Zeno effect (QZE) to suppress a decay process with Nuclear Magnetic Resonance (NMR). Nuclear spins are affected by low frequency noise, and so one can naturally observe non-exponential decay behavior, which is prerequisite in observing QZE. We also describe that a key component for QZE, namely measurements on the nuclear spin, can be...

Journal: :middle east journal of cancer 0
sedigheh tahmasebi general surgery department, shiraz university of medical sciences, shiraz, iran mohammad hasan hashemizadeh general surgery department, shiraz university of medical sciences, shiraz, iran abdolrasoul talei general surgery department, shiraz university of medical sciences, shiraz, iran sepideh sefidbakht department of radiology, shiraz university of medical sciences, shiraz, iran maral mokhtari department of pathology, shiraz university of medical sciences, shiraz, iran abdolkhalegh keshavarzi general surgery department, shiraz university of medical sciences, shiraz, iran

background : magnetic resonance imaging of the breast is becoming a useful adjunct to mammography and sonography for the detection of breast lesions. however, it is not yet accepted as a routine examination for all breast cancer patients due to the lack of data regarding whether breast magnetic resonance imaging impacts recurrence or survival. this trial examines the use of magnetic resonance i...

Journal: :Journal of the American College of Cardiology 1986

Journal: :Philosophical transactions. Series A, Mathematical, physical, and engineering sciences 2012
R M Serra I S Oliveira

For the past decade, nuclear magnetic resonance (NMR) has been established as a main experimental technique for testing quantum protocols in small systems. This Theme Issue presents recent advances and major challenges of NMR quantum information possessing (QIP), including contributions by researchers from 10 different countries. In this introduction, after a short comment on NMR-QIP basics, we...

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