A. O. Rodríguez
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View article: RF coil that minimizes electronic components while enhancing performance for rodent MRI at 7 Tesla
RF coil that minimizes electronic components while enhancing performance for rodent MRI at 7 Tesla Open
This study introduces a novel volume coil design that features two slotted end-plates connected by six rungs, resembling the traditional birdcage coil. The end rings are equipped with six evenly distributed circular slots, inspired by Mans…
View article: Electric Field Sensing with a Modified SRR for Wireless Telecommunications Dosimetry
Electric Field Sensing with a Modified SRR for Wireless Telecommunications Dosimetry Open
Split ring resonators (SRRs) have been used extensively in metamaterials, showing a strong localization and enhancement of fields, which significantly improves the sensitivity and resolution of the electromagnetic field sensors. We propose…
View article: Modified petal resonator surface coil for UHF-MRI
Modified petal resonator surface coil for UHF-MRI Open
In this paper, a modified radio frequency (RF) coil version is presented to be suitable to work at 900 MHz. The proposed coil is based on the Petal Surface Coil and Petal Resonator Surface Coil, whose resonant frequencies were 22 MHz and 6…
View article: N-AcetylLaspartic Acid Phantom for Proton Magnetic Resonance Spectroscopy at 1.5 T and 3 T
N-AcetylLaspartic Acid Phantom for Proton Magnetic Resonance Spectroscopy at 1.5 T and 3 T Open
Proton Magnetic Resonance Spectroscopy (MRS) phantoms are an important tool for quality assurance and reliability. Some of the contents are not easily available in some countries due to some company policies. We built a phantom using N-Ace…
View article: RF shield parallel-plate waveguide for travelling-wave MRI experiments at 3 T
RF shield parallel-plate waveguide for travelling-wave MRI experiments at 3 T Open
Ultra high field magnetic resonance imaging systems suffer from the standing wave problems produced by conventional radiofrequency coils. This causes inhomogeneous fields degrading the image quality. To overcome this problems, propagation …
View article: Experimental Method for Visualizing RF Electromagnetic Waves
Experimental Method for Visualizing RF Electromagnetic Waves Open
This paper presents a method to visualize the result of the interaction of radiofrequency electromagnetic waves radiated by a log-antenna and gas-filled tubes. The test waves were in the frequency range of 200-500 MHz. Frequency and Voltag…
View article: Remote RF excitation for a small-bore MR imager at 15.2 T
Remote RF excitation for a small-bore MR imager at 15.2 T Open
The travelling-wave MRI approach is an alternative to overcome the B1 inhomogeneity at UHF MRI for human applications. More recently, this concept has been also used with animal MR imagers. We used a parallel-plate waveguide and a bio-insp…
View article: Bio-inspired surface coil for small-bore MRI at 15.2 T
Bio-inspired surface coil for small-bore MRI at 15.2 T Open
We looked for a biological analogy to developed an improved surface coil to acquire magnetic resonance images. Nature offers engineering solutions that can be exploited to improve the performance of devices, such as MRI RF coils. In this p…
View article: Numerical Analysis of a Flexible Dual Loop Coil and its Experimental Validation for pre-Clinical Magnetic Resonance Imaging of Rodents at 7 T
Numerical Analysis of a Flexible Dual Loop Coil and its Experimental Validation for pre-Clinical Magnetic Resonance Imaging of Rodents at 7 T Open
A surface radio frequency coil was developed for small animal image acquisition in a pre-clinical magnetic resonance imaging system at 7 T. A flexible coil composed of two circular loops was developed to closely cover the object to be imag…
View article: Transmission of travelling-wave with a simple waveguide for rodents MRI at 9.4 T
Transmission of travelling-wave with a simple waveguide for rodents MRI at 9.4 T Open
Standard coils can cause inhomogeneities due to the standing wave patterns at ultra high field MRI. This B1 inhomogeneity can be overcome using the travelling-wave MRI (twMRI) approach. The ma- jority of twMRI research has been done with c…
View article: Functional Magnetic Resonance Study of Non-conventional Morphological Brains: malnourished rats
Functional Magnetic Resonance Study of Non-conventional Morphological Brains: malnourished rats Open
Malnutrition during brain development can cause serious problems that can be irreversible. Dysfunctional patterns of brain activity can be detected with functional MRI. We used BOLD functional Magnetic Resonance Imaging (fMRI) to investiga…
View article: Numerical study of remote detection outside the magnet with travelling wave Magnetic Resonance Imaging at 3T
Numerical study of remote detection outside the magnet with travelling wave Magnetic Resonance Imaging at 3T Open
The use of the travelling wave approach for high magnetic field magnetic resonance imaging has been used recently with very promising results. This approach offer images one with greater field-of-view and a reasonable signal-to-noise ratio…