Development of diffusion-weighted image using a 0.3T open MRI

Terada, Hitoshi; Gomi, Tatsuya; Harada, Hideto; Chiba, Takahito; Nakamura, T.; Iwabuchi, Satoshi; Nemoto, Hiroshi; Kawasaki, Shinji; Watanabe, Shinya; Nagamoto, Masashi; Kawawa, Yoko; Kohda, Ehiichi

doi:10.1016/s0150-9861(06)77229-7

Cited by 11 publications

(11 citation statements)

References 10 publications

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“…There are also proponents of expanding low‐field (<0.5 T) MR technology because of its cost savings and open format 20 . The disadvantages to using low‐field MRI include reduced image quality, longer scan times and difficulties with contrast enhancement, fat suppression and DWI 21–24 . We caution against the exclusive use of low‐field, open MRI scanners for orbital and neuroimaging when high‐field scanning is available.…”

Section: Resultsmentioning

confidence: 99%

“…20 The disadvantages to using low-field MRI include reduced image quality, longer scan times and difficulties with contrast enhancement, fat suppression and DWI. [21][22][23][24] We caution against the exclusive use of low-field, open MRI scanners for orbital and neuroimaging when high-field scanning is available. The detailed physics of MRI is beyond the scope of this review and the reader is referred to other, more in-depth neuroradiology publications for further information.…”

Section: Magnetic Resonance Imagingmentioning

confidence: 99%

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Imaging for neuro‐ophthalmic and orbital disease – a review

Lee

Johnson

Policeni

et al. 2009

Clinical Exper Ophthalmology

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A literature review was performed by content experts in neuro-ophthalmology and neuroradiology using a systematic English-language Medline search (1994)(1995)(1996)(1997)(1998)(1999)(2000)(2001)(2002)(2003)(2004)(2005)(2006)(2007)(2008) limited to articles with relevance to neuro-ophthalmic and orbital imaging. The information covered in this review includes: (i) the basic mechanics, indications and contraindications for cranial and orbital computed tomography and magnetic resonance (MR) imaging; (ii) the utility and indications for intravenous contrast, (iii) the use of specific MR sequences; (iv) the techniques and ophthalmic indications for computed tomography/MR angiography and venography; and (v) the techniques and indications for functional MR imaging, positron emission tomography scanning and single photon emission computed tomography. Throughout the review accurate and timely communication with the neuroradiologist regarding the clinical findings and suspected location of lesions is emphasized so as to optimize the ordering and interpretation of imaging studies for the ophthalmologist.

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Section: Resultsmentioning

confidence: 99%

Section: Magnetic Resonance Imagingmentioning

confidence: 99%

Imaging for neuro‐ophthalmic and orbital disease – a review

Lee

Johnson

Policeni

et al. 2009

Clinical Exper Ophthalmology

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“…[15] In a study comparing single-shot-DWI at 1.5T and multishot-DWI at 0.3T, it was found that patient movement was the only factor militating against successful multishot-DWI acquisition on low-field units. [17] …”

Section: Appraisal Of Low-field Diffusion Weighted Imagingmentioning

confidence: 99%

Role of diffusion-weighted imaging in acute stroke management using low-field magnetic resonance imaging in resource-limited settings

et al. 2015

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A variety of imaging modalities exist for the diagnosis of stroke. Several studies have been carried out to ascertain their contribution to the management of acute stroke and to compare the benefits and limitations of each modality. Diffusion-weighted imaging (DWI) has been described as the optimal imaging technique for diagnosing acute ischemic stroke, yet limited evidence is available on the value of DWI in the management of ischemic stroke with low-field magnetic resonance (MR) systems. Although high-field MR imaging (MRI) is desirable for DWI, low-field scanners provide an acceptable clinical compromise which is of importance to developing countries posed with the challenge of limited availability of high-field units. The purpose of this paper was to systematically review the literature on the usefulness of DWI in acute stroke management with low-field MRI scanners and present the experience in Nigeria.

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“…In another DWI acute stroke study at 0.3T, Tereda et al detected 92% of infarcts that were detected by 1.5T-DWI as well. 65 The size and extension of the high signal on 0.3T-DWI were the same as those of the high signal on 1.5T-DWI in 67% of the total cases. As no ADC maps were presented at 0.3T or 0.36T, the nature of these hyperintensities in DWI remains questionable.…”

Section: Low-field Clinical and Research Stroke Studiesmentioning

confidence: 68%

“…Some of the commercially available LF and VLF/ULF MR scanners have reported DWI sequences with diagnostic quality, enabling to successfully identify stroke lesions. 56,[64][65][66] Performing DWI at 64 mT, Hyperfine Research (Guilford, CT) examined acute stroke patients with a portable, bedside MR scanner and was capable of producing 3D clinical quality images. 64,67,68 However, studies comparing stroke images from the Hyperfine device for stroke with standard clinical MRI (1.5T and above) are still needed for validation.…”

Section: Low-field Clinical and Research Stroke Studiesmentioning

confidence: 99%

Low‐Field MRI of Stroke: Challenges and Opportunities

Bhat

Fernandes

Poojar

et al. 2020

Magnetic Resonance Imaging

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Stroke is a leading cause of death and disability worldwide. The reasons for increased stroke burden in developing countries are inadequately controlled risk factors resulting from poor public awareness and inadequate infrastructure. Computed tomography and MRI are common neuroimaging modalities used to assess stroke with diffusion-weighted MRI, in particular, being the recommended choice for acute stroke imaging. However, access to these imaging modalities is primarily restricted to major cities and high-income groups. In the case of stroke, the time-window of treatment to limit the damage is of a few hours and needs a point-of-care diagnosis. A low-cost MR system typically achieved at the ultra-lowand very-low-field would meet the need for a geographically accessible and portable solution. We review studies focused on accessible stroke imaging and recent developments in MR methodologies, including hardware, to image at low fields. We hypothesize that in the absence of a formal, rapid stroke triaging system, the value of timely on-site delivery of the scanner to the stroke patient can be significant. To this end, we discuss multiple recent hardware and methods developments in the low-field regime. Our review suggests a compelling need to explore further the trade-offs between high signal, contrast, and accessibility at low fields in low-income communities.

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Development of diffusion-weighted image using a 0.3T open MRI

Cited by 11 publications

References 10 publications

Imaging for neuro‐ophthalmic and orbital disease – a review

Imaging for neuro‐ophthalmic and orbital disease – a review

Role of diffusion-weighted imaging in acute stroke management using low-field magnetic resonance imaging in resource-limited settings

Low‐Field MRI of Stroke: Challenges and Opportunities

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