New challenges and opportunities for low-field MRI

Anoardo, Esteban; Rodriguez, Gonzalo G.

doi:10.1016/j.jmro.2022.100086

Cited by 3 publications

(5 citation statements)

References 68 publications

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Section: Discussionmentioning

confidence: 99%

“…17 Apart from SNR, image distortion caused by the increased level of inhomogeneities in the main magnetic field especially while using gradient sequences, is an area where more research regarding better processing techniques to improve image quality is essential. 42 While we talk about low-field scanners, Sarracanie et al 43 demonstrated short acquisition times with high SNR per unit time using the ultra-low field (6.5 mT) MRI, dating back to 2015. This was accomplished using the sparse sampling strategies (50% of k-space is sampled) and fully refocused three-dimensional (3D) balanced steady-state free precession sequences in an optimized electromagnet "20 cm field of view" mobile brain scanner with neither prepolarization nor cryogenics.…”

Section: Discussionmentioning

confidence: 99%

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The Rise and Efficiency of Low Field Portable MRI Scanners

Pires,

M.M

2023

Journal of Health and Allied Sciences NU

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Since the discovery of magnetic resonance imaging (MRI) as an imaging modality, it has evolved immensely and is still doing so. Most imaging modalities have made bedside or emergency imaging possible due to their portability. This aspect is yet to be fully evaluated and established in the case of MRI as its high-field strength requires specialized infrastructure and its time-consuming nature makes its portability questionable. The goal of this review is to access the efficiency and feasibility of low-field portable MRI (pMRI) systems in a wide array of health care applications. Articles from indexed journals, on PubMed, Springer, Elsevier, etc. databases, relevant to this study were searched and reviewed. This review provides an atypical design that could be used in making a pMRI unit that could find its potential in diagnosing a wide variety of pathologies with an added advantage of imaging critical patients in the intensive care unit or patients in isolation due to its portability, imaging patients with implants or prosthesis effectively due to its low field, pediatric imaging due to its high speed, for guided interventions, imaging obese and claustrophobic patients due to its open nature, in dental imaging, extremity scanning, etc. With its vast spectrum of applications in the health care system, the future of low-field pMRI units seems to be bright.

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

The Rise and Efficiency of Low Field Portable MRI Scanners

Pires,

M.M

2023

Journal of Health and Allied Sciences NU

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“…The development of low field MRI instruments (<0.2 T) is growing drastically [1][2][3] motivated by the possibility of cost reductions [4,5], portability [6][7][8][9][10], and contrastenhancement [11]. However, critical points to consider are the lower signal to noise ratio (SNR) [12], magnetic field homogeneity [9], and magnetic field stability [13].…”

Section: Introductionmentioning

confidence: 99%

“…However, the SNR can be improved by different means, from a simple signal averaging to different hardware and computational contraptions. Some explored hardware solutions include, among other, hyperpolarization schemes [11], magnetic field-cycling technology [3,13,15], single or multiple receiver channels using superconducting quantum interference devices (SQUID) [16][17][18] and coupling to external resonators or magnetic lenses for signal enhancement [19][20][21]. Specially designed pulse sequences are also considered [22,23], while image pos-processing can be used to artificially enhance the image SNR [24,25].…”

Section: Introductionmentioning

confidence: 99%

“…This feature is usually an important point to consider if electromagnets are chosen. However, the implementation of electromagnets in MRI prototypes has shown promising results [2,3,39,40]. This approach is attractive since it allows switching the magnetic field [41, 42], then enabling the acquisition of images with contrasts unavailable at fixed magnetic fields [43,44].…”

Section: Introductionmentioning

confidence: 99%

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Low-field MRI at high magnetic field instability and inhomogeneity conditions

Rodriguez,

Schürrer,

Anoardo

2023

Front. Phys.

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Understanding the effects of the magnetic field time instabilities in magnetic resonance imaging (MRI) is fundamental for the success of portable and low-cost MRI hardware based on electromagnets. In this work we propose a magnetic field model that considers the field instability in addition to the inhomogeneity. We have successfully validated the model on signals acquired with a commercial NMR instrument. It was used to simulate the image defects due to different types of instability for both the spin-echo and the gradient-echo sequences. We have considered both random field fluctuations, and an instability having a dominant harmonic component. Strategies are suggested to minimize the artifacts generated by these instabilities. Images were acquired using a home-made MRI relaxometer to show the consistency of the analysis.

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Assessment of the Diagnostic Efficacy of Low-Field Magnetic Resonance Imaging: A Systematic Review

Mašková,

Rožánek,

Gajdoš

et al. 2024

Diagnostics

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Background: In recent years, there has been an increasing effort to take advantage of the potential use of low magnetic induction devices with less than 1 T, referred to as Low-Field MRI (LF MRI). LF MRI systems were used, especially in the early days of magnetic resonance technology. Over time, magnetic induction values of 1.5 and 3 T have become the standard for clinical devices, mainly because LF MRI systems were suffering from significantly lower quality of the images, e.g., signal–noise ratio. In recent years, due to advances in image processing with artificial intelligence, there has been an increasing effort to take advantage of the potential use of LF MRI with induction of less than 1 T. This overview article focuses on the analysis of the evidence concerning the diagnostic efficacy of modern LF MRI systems and the clinical comparison of LF MRI with 1.5 T systems in imaging the nervous system, musculoskeletal system, and organs of the chest, abdomen, and pelvis. Methodology: A systematic literature review of MEDLINE, PubMed, Scopus, Web of Science, and CENTRAL databases for the period 2018–2023 was performed according to the recommended PRISMA protocol. Data were analysed to identify studies comparing the accuracy, reliability and diagnostic performance of LF MRI technology compared to available 1.5 T MRI. RESULTS: A total of 1275 publications were retrieved from the selected databases. Only two articles meeting all predefined inclusion criteria were selected for detailed assessment. Conclusions: A limited number of robust studies on the accuracy and diagnostic performance of LF MRI compared with 1.5 T MRI was available. The current evidence is not sufficient to draw any definitive insights. More scientific research is needed to make informed conclusions regarding the effectiveness of LF MRI technology.

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New challenges and opportunities for low-field MRI

Cited by 3 publications

References 68 publications

The Rise and Efficiency of Low Field Portable MRI Scanners

The Rise and Efficiency of Low Field Portable MRI Scanners

Low-field MRI at high magnetic field instability and inhomogeneity conditions

Assessment of the Diagnostic Efficacy of Low-Field Magnetic Resonance Imaging: A Systematic Review

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