Phased Array Receiving Coils for Low Field Lungs MRI: Design and Optimization

Vojtíšek, L.; Frollo, Ivan; Valkovič, Ladislav; Gogola, D.; Juráš, Vladimír

doi:10.2478/v10048-011-0012-3

Cited by 5 publications

(4 citation statements)

References 11 publications

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“…For many arrays the basic geometry consists of a combination of loops and butterfly coils, as illustrated in Fig. d for a four‐element array designed for thorax imaging: in this case, the dimensions of the array were optimized to minimize the geometry factor (g‐factor) for parallel imaging with a SENSE factor of four.…”

Section: Advances In Hardwarementioning

confidence: 99%

Low‐field MRI: An MR physics perspective

Marques

Simonis

Webb

2019

Magnetic Resonance Imaging

246

266

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Historically, clinical MRI started with main magnetic field strengths in the ∼0.05–0.35T range. In the past 40 years there have been considerable developments in MRI hardware, with one of the primary ones being the trend to higher magnetic fields. While resulting in large improvements in data quality and diagnostic value, such developments have meant that conventional systems at 1.5 and 3T remain relatively expensive pieces of medical imaging equipment, and are out of the financial reach for much of the world. In this review we describe the current state‐of‐the‐art of low‐field systems (defined as 0.25–1T), both with respect to its low cost, low foot‐print, and subject accessibility. Furthermore, we discuss how low field could potentially benefit from many of the developments that have occurred in higher‐field MRI. In the first section, the signal‐to‐noise ratio (SNR) dependence on the static magnetic field and its impact on the achievable contrast, resolution, and acquisition times are discussed from a theoretical perspective. In the second section, developments in hardware (eg, magnet, gradient, and RF coils) used both in experimental low‐field scanners and also those that are currently in the market are reviewed. In the final section the potential roles of new acquisition readouts, motion tracking, and image reconstruction strategies, currently being developed primarily at higher fields, are presented. Level of Evidence : 5 Technical Efficacy Stage : 1 J. Magn. Reson. Imaging 2019.

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Section: Advances In Hardwarementioning

confidence: 99%

Low‐field MRI: An MR physics perspective

Marques

Simonis

Webb

2019

Magnetic Resonance Imaging

246

266

View full text Add to dashboard Cite

show abstract

“…Although MR systems with high magnetic field strengths are the mainstream scanners these days, lowfield systems are still commonly used, as they provide space and accessibility important for claustrophobic and obese patients, for example, as well as for children, who are often fearful in closed MR scanners. Low fields are also useful for modern applications, such as blood oxygenation level dependent contrast MRI (BOLD MRI) [4], [5] and are even more desirable than high fields in some special applications, e.g., hyperpolarized gas lung MRI [6], [7]. In these types of scanners, the SNR is usually increased through signal averaging, which also makes the examination timedemanding.…”

Section: Introductionmentioning

confidence: 99%

Design and Construction of Novel Instrumentation for Low-Field MR Tomography

Gogola

Szomolányi

Škrátek

et al. 2018

Measurement Science Review

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Magnetic resonance imaging (MRI) is a very popular tool for diagnostic applications and research studies. Low-field MR scanners, usually with an open design, are suitable for claustrophobic and obese patients, as well as for children, who may be fearful in closed MR scanners. However, these types of scanners provide lower spatial resolution and a lower signal-to-noise ratio (SNR) if compared with the same examination performed at the same time at high field scanners. It is dominantly caused by the low field strength and other factors, such as radiofrequency noise. Therefore, a long measurement time is usually necessary. This research paper is focused on the development of novel probes and preamplifiers for low-field MR scanners to improve SNR, and thus, shorten the measurement time. In this study, we describe the design of a high impedance preamplifier and a high temperature superconductor (HTS) coil. This novel instrumentation was compared with uncooled and cooled copper coils. Improvement in SNR in the case of an HTS coil is reported.

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“…However, the continuity and spatial arrangement of the damaged TMJ cannot be identified from these 2D slices [1][2][3][4]. The TMJ belongs to the most complex joints in the human body.…”

Section: Introductionmentioning

confidence: 99%

MRI Slice Segmentation and 3D Modelling of Temporomandibular Joint Measured by Microscopic Coil

Smirg¹,

Liberda²,

Smékal³

et al. 2012

Measurement Science Review

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The paper focuses on the segmentation of magnetic resonance imaging (MRI) slices and 3D modelling of the temporomandibular joint disc in order to help physicians diagnose patients with dysfunction of the temporomandibular joint (TMJ). The TMJ is one of the most complex joints in the human body. The most common joint dysfunction is due to the disc. The disc is a soft tissue, which in principle cannot be diagnosed by the CT method. Therefore, a 3D model is made from the MRI slices, which can image soft tissues. For the segmentation of the disc in individual slices a new method is developed based on spatial distribution and anatomical TMJ structure with automatic thresholding. The thresholding is controlled by a genetic algorithm. The 3D model is realized using the marching cube method.

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Phased Array Receiving Coils for Low Field Lungs MRI: Design and Optimization

Cited by 5 publications

References 11 publications

Low‐field MRI: An MR physics perspective

Low‐field MRI: An MR physics perspective

Design and Construction of Novel Instrumentation for Low-Field MR Tomography

MRI Slice Segmentation and 3D Modelling of Temporomandibular Joint Measured by Microscopic Coil

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