نتایج جستجو برای: radiofrequency field

تعداد نتایج: 803430  

Journal: :Journal of Cardiovascular Magnetic Resonance 2008

Journal: :Journal of Exposure Science & Environmental Epidemiology 2012

1997
Malcolm H. Levitt

The signs of radiofrequency phases and frequencies used in are also fraught with subtle sign problems, for example, NMR are examined carefully. Some fundamental problems with cross-correlated relaxation (4–9) , nuclear demagnetizing current usage are exposed by simple examples. The entire chain of field effects (10–13) , and phase or frequency shifts induced events leading to the NMR spectrum i...

2015
Yue Song Jingjing Zheng Mingwei Yan Weidong Ding Kui Xu Qingyu Fan Zhao Li Chunfeng Zhao

BACKGROUND To evaluate the potential effects of irreversible electroporation ablation on the Achilles tendon in a rabbit model and to compare the histopathological and biomechanical changes between specimens following electroporation ablation and radiofrequency ablation. METHODS A total of 140 six-month-old male New Zealand rabbits were used. The animals were randomly divided into two groups,...

2010
Rodney P. O'Connor Steve D. Madison Philippe Leveque H. Llewelyn Roderick Martin D. Bootman

In the course of modern daily life, individuals are exposed to numerous sources of electromagnetic radiation that are not present in the natural environment. The strength of the electromagnetic fields from sources such as hairdryers, computer display units and other electrical devices is modest. However, in many home and office environments, individuals can experience perpetual exposure to an "...

Journal: :Magnetic resonance in medicine 2010
Laura I Sacolick Florian Wiesinger Ileana Hancu Mika W Vogel

A novel method for amplitude of radiofrequency field (B1+) mapping based on the Bloch-Siegert shift is presented. Unlike conventionally applied double-angle or other signal magnitude-based methods, it encodes the B(1) information into signal phase, resulting in important advantages in terms of acquisition speed, accuracy, and robustness. The Bloch-Siegert frequency shift is caused by irradiatin...

A. R. Mehdizadeh G. Namdari M. Motamedifar, M. Taheri S. M. J. Mortazavi

Background: Pre-exposure to radiofrequency radiations of mobile phones would significantly increase the survival rate of exposed animals compared to those exposed to a lethal dose of gamma radiation alone. Stimulation of the immune system is believed to be a key mechanism for the induction of this phenomenon, the so-called “adaptive response.” The immune system protects organisms against in...

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