Mri Coil
Mostrando 1-12 de 16 artigos, teses e dissertações.
-
1. A pancreatic hemorrhagic pseudocyst with pseudoaneurysm and the role of doppler ultrasonography: a case report
SUMMARY Hemorrhagic pseudocysts with pseudoaneurysms are a rare and fatal complication of chronic pancreatitis due to the erosion of pancreatic to peripancreatic arteries. The timing of the rupture cannot be accurately predicted, but prompt diagnosis and management are essential to prevent further bleeding. We describe the case of a 68-year-old man who prese
Rev. Assoc. Med. Bras.. Publicado em: 2019-02
-
2. Prostate cancer detection using multiparametric 3 – tesla MRI and fusion biopsy: preliminary results
ABSTRACT Objective: To evaluate the diagnostic efficacy of transrectal ultrasonography (US) biopsy with imaging fusion using multiparametric (mp) magnetic resonance imaging (MRI) in patients with suspicion of prostate cancer (PCa), with an emphasis on clinically significant tumors according to histological criteria. Materials and Methods: A total of 189 co
Int. braz j urol.. Publicado em: 2016-10
-
3. The value of magnetic resonance imaging in the diagnosis of penile fracture
Purpose We studied the use of magnetic resonance imaging in the diagnosis of penile fracture. Materials and Methods Between 1997 and 2012, fifteen patients (age range 17-48 years, mean age 37 years) with suspected penile fracture underwent MRI examinations. Ten patients were injured during sexual intercourse, whereas four patients were traumatized by non-ph
Int. braz j urol.. Publicado em: 2015-04
-
4. Magnetic Resonance Image in the diagnosis and evaluation of extra-prostatic extension and involvement of seminal vesicles of prostate cancer: a systematic review of literature and meta-analysis
Objective Systematic review of literature and meta-analysis to evaluate the results of magnetic resonance image 1.5T with endorectal coil in the diagnosis and evaluation of extra-prostatic extension and involvement of seminal vesicles of prostate cancer, compared to the histopathological results of the radical prostatectomy specimen. Materials and Methods
Int. braz j urol.. Publicado em: 2013-04
-
5. Avaliação da cartilagem da ATM por meio de ressonância magnética com a utilização de bobinas microscópicas / MRI assessment of TMJs cartilage with the use of microscopic coils
Differences in thickness and regularity of the temporomandibular joints (TMJ) cartilage occur as the result of areas of growth or remodeling. This fact leads to misinterpretations on diagnosis and generally neglects the presence of fibrocartilage. The present study, using MRI microscopic coils, allows better observation of the articular cartilage. This evide
Publicado em: 2009
-
6. Shielded transceiver RF coil array for simultaneous PET-MRI
The complementary information provided by combined MRI-PET modalities promises to facilitate metabolic investigations of complex physiological processes. We developed a radio frequency (RF) coil array that can operate in close proximity (2-mm radial distance) to a miniaturized PET camera insert for simultaneous PET-MRI of a rat brain at high magnetic fields
Brazilian Journal of Physics. Publicado em: 2008-06
-
7. Cerebral perfusion quantification using arterial spin labeling: applications in vascular territories measurement and functional imaging / Quantificação da perfusão sanguínea cerebral utilizando arterial spin labeling: aplicações em medidas de territórios vasculares e em imagens funcionais
Arterial spin labeling techniques allow to obtain quantitative maps of perfusion non-invasively. Along with other MRI techniques, it has proven useful for diagnosis of a variety of cerebrovascular diseases. Amongst the available basic implementations, the continuous approach employing a dedicated labeling RF coil has the advantages of presenting high signal-
Publicado em: 2008
-
8. A simple theory for vibration of MRI gradient coils
Vibrations of a string can provide a model for vibrations of MRI coil assemblies. The string model for the vibrations of MRI coils is presented, and compared with experimental results. Gradient coils exhibit resonant modes because of the finite coil length, l, and the elasticity of materials that comprise the assembly. The resonance frequencies depend on l a
Brazilian Journal of Physics. Publicado em: 2006-03
-
9. Transdutores de RF para experimento de imagens em pequenos animais / RF coils for MRI experiments on small animals
O objetivo deste projeto é o desenvolvimento de transdutores de RF tipo gaiola (birdcage coil) e sela (saddle coil), com desenho especial inovador, que mantém elementos com comprimento elétrico constante, para um campo magnético de 2 Tesla. Este transdutor deve permitir o estudo e também o desenvolvimento de novas metodologias em imagens e espectroscopi
Publicado em: 2006
-
10. "Development and clinical applications of a high performance radio-frequency/gradient coil integrated system for Magnetic Resonance Imaging in 0.5 Tesla" / "Desenvolvimento e aplicações clínicas de um sistema integrado transdutor/bobinas de gradientes de alto desempenho para obtenção de imagens por ressonância magnética em 0.5 TESLA"
Este trabalho descreve o desenvolvimento de um sistema integrado transdutor/bobinas de gradientes de alto desempenho para Imagens por Ressonância Magnética. Este sistema é composto por um transdutor de radiofreqüência tipo sela e um conjunto de 3 bobinas locais assimétricas. No desenho do transdutor foram otimizados os parâmetros: relação sinal ruí
Publicado em: 2005
-
11. Mri coil design and receiver system for ultra low field magnetic resonance imaging / Projeto e construção de um equipamento de imagens por ressonância magnética para uso em rotina clínica e em pesquisa
In this work current vs. voltage (I vs. V) and alternating conductivity (ac) measurements were carried out in poly[(2-methoxy- 5-hexyloxy)-pphenylenevinilene] ? MEH-PPV light-emitting diodes having zinc oxide (ZnO) as transparent anode and Al as metallic cathode. MEH-PPV is a PPV derivative, which emits in the red spectral region; ZnO has a work function sim
Publicado em: 2001
-
12. Mri coil design and receiver system for ultra low field magnetic resonance imaging / Projeto de transdutores e otimização do sistema de recepção do tomógrafo de RMN de campo magnético ultrabaixo
O objetivo deste trabalho foi melhorar a relação sinal-ruído de um sistema de imagens por ressonância magnética nuclear (TORM 005), através do desenvolvimento de bobinas de recepção mais eficientes, de circuitos de sintonia balanceados, circuitos de desacoplamento de potência para as bobinas receptoras e da melhoria do ambiente eletromagnético no q
Publicado em: 1995