Transmission Line Impedance Matching Using the Smith Chart (Letters)

Arnold, R.M.

doi:10.1109/tmtt.1974.1128402

Cited by 12 publications

(2 citation statements)

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“…The new devices are Printed Card Board (PCB) loops designed using the Eagle software [18]. The associated circuitry was created following the procedure depicted in [19]. The devices were simulated and tested individually in a network analyzer (Agilent -E5062A-275) before coupling them to the MRI scanner.…”

Section: Methodsmentioning

confidence: 99%

Homemade array of surface coils implementation for small animal magnetic resonance imaging

Yepes-Calderon¹,

Beuf²

2017

Adv. sci. technol. eng. syst. j.

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Small animal modeling is an exciting research field where human pathogenic frameworks can be replicated in a controlled environment. Accurate Imaging is in high demand when modeling abnormalities and, magnetic resonance imaging plays a vital role due to its demonstrated lowest intrusion when compared with other imaging methods. However, the required high-resolution yields low-quality images and often, critical events are masked. In this manuscript, we improve the images in small animal frameworks by modifying the reception coils to parallelize the readings and by dealing with the mutual induction produced at the dimensions required for the studied subjects.

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Section: Methodsmentioning

confidence: 99%

Homemade array of surface coils implementation for small animal magnetic resonance imaging

Yepes-Calderon¹,

Beuf²

2017

Adv. sci. technol. eng. syst. j.

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“…Homemade printed card board (PCB) surface coils designed using the Eagle software [4] were placed as receptors. The loops’ circuitry was created following the procedure depicted in [1]. The devices were simulated and tested individually in a network analyzer (Agilent - E5062A-275) before coupling them to the MRI scanner.…”

Section: Methodsmentioning

confidence: 99%

Magnetic resonance image enhancement by reducing receptors' effective size and enabling multiple channel acquisition

Yepes-Calderon

Velásquez

Leporé

et al. 2014

2014 36th Annual International Conference of the IEEE Engineering in Medicine and Biology Society

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Magnetic resonance imaging is empowered by parallel reading, which reduces acquisition time dramatically. The time saved by parallelization can be used to increase image quality or to enable specialized scanning protocols in clinical and research environments. In small animals, the sizing constraints render the use of multi-channeled approaches even more necessary, as they help to improve the typically low spatial resolution and lesser signal-to-noise ratio; however, the use of multiple channels also generates mutual induction (MI) effects that impairs imaging creation. Here, we created coils and used the shared capacitor technique to diminish first degree MI effects and pre-amplifiers to deal with higher order MI-related image deterioration. The constructed devices are tested by imaging phantoms that contain identical solutions; thus, creating the conditions for several statistical comparisons. We confirm that the shared capacitor strategy can recover the receptor capacity in compounded coils when working at the dimensions imposed by small animal imaging. Additionally, we demonstrate that the use of pre-amplifiers does not significantly reduce the quality of the images. Moreover, in light of our results, the two MI-avoiding techniques can be used together, therefore establishing the practical feasibility of flexible array coils populated with multiple loops for small animal imaging.

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Impedance Transformers and Matching Networks

Wu¹,

Deslandes²,

Cassivi³

2005

Encyclopedia of RF and Microwave Engineering

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Impedance transformers and matching networks are probably the most widely used building blocks in both passive and active radiofrequency (RF ) and microwave circuits, which can be found everywhere in various systems and applications. The transmission‐line technique is fundamental in the design of impedance transformers and matching networks at microwave frequencies, whatever distributed or lumped element platforms are used. This article presents the basic structures and electrical mechanisms of impedance transformers and matching networks as well as transmission‐line transitions, including typical balun structures. Properties and performances of various circuit elements are summarized, discussed, and compared. Popular examples are shown to highlight application aspects and technical features of practical impedance transformers and matching networks.

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Transmission Line Impedance Matching Using the Smith Chart (Letters)

Cited by 12 publications

References 0 publications

Homemade array of surface coils implementation for small animal magnetic resonance imaging

Homemade array of surface coils implementation for small animal magnetic resonance imaging

Magnetic resonance image enhancement by reducing receptors' effective size and enabling multiple channel acquisition

Impedance Transformers and Matching Networks

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