Methodology for 3D image reconstruction of the female pelvis from upright open MRI (MRO) 2D imaging

Abdulaziz, Marwa; Stothers, Lynn; Macnab, Andrew

doi:10.3233/bsi-180178

Cited by 2 publications

(5 citation statements)

References 29 publications

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“…Several low-field MR scanners that enable integrated radiotherapy using either Cobalt-60 sources or linear accelerators for irradiation are on the market or under development. [41][42][43][44][45][46] These scanners have been developed in order to image the anatomy of a patient while performing radiation therapy, enabling better control of radiation dose. All of these systems cover the whole body and have gradient slew rates compared to other whole-body low-field MR systems (see Table 1).…”

Section: Overview Of the Main Trends In The Marketmentioning

confidence: 99%

“…However, many more topics of clinical relevance benefit from upright imaging; for example, vaginal prolapse and venous blood flow. 43,44 Weight-bearing scans can be achieved by having a machine in which the magnets are aligned vertically, generating a "vertical bore" in which the patient can be upright or placed on a table. 45 Another solution is to build a rotatable magnet, which means that the patient can be scanned lying down or standing up.…”

Section: Overview Of the Main Trends In The Marketmentioning

confidence: 99%

“…Integrating therapy and imaging is a growing technology over the last few years. Several low‐field MR scanners that enable integrated radiotherapy using either Cobalt‐60 sources or linear accelerators for irradiation are on the market or under development . These scanners have been developed in order to image the anatomy of a patient while performing radiation therapy, enabling better control of radiation dose.…”

Section: Overview Of the Main Trends In The Marketmentioning

confidence: 99%

“…, in which the amount of vertebral disc protrusion becomes more evident in an upright position. However, many more topics of clinical relevance benefit from upright imaging; for example, vaginal prolapse and venous blood flow . Weight‐bearing scans can be achieved by having a machine in which the magnets are aligned vertically, generating a “vertical bore" in which the patient can be upright or placed on a table .…”

Section: Overview Of the Main Trends In The Marketmentioning

confidence: 99%

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Low‐field MRI: An MR physics perspective

Marques

Simonis

Webb

2019

Magnetic Resonance Imaging

232

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: Overview Of the Main Trends In The Marketmentioning

confidence: 99%

Section: Overview Of the Main Trends In The Marketmentioning

confidence: 99%

Section: Overview Of the Main Trends In The Marketmentioning

confidence: 99%

Section: Overview Of the Main Trends In The Marketmentioning

confidence: 99%

See 2 more Smart Citations

Low‐field MRI: An MR physics perspective

Marques

Simonis

Webb

2019

Magnetic Resonance Imaging

232

266

View full text Add to dashboard Cite

show abstract

“…We have also reported the enhanced diagnostic information generated by creating 3D models of the pelvic architecture from 2D MRO upright imaging. 37 However, imaging in the sitting position did not demonstrate benefit in the context of POP. This was principally due to anatomical landmarks necessary for defining the HL and ML reference lines being obscured by upward movement of the anorectal junction above the PCL.…”

Section: Cuaj -Original Researchmentioning

confidence: 99%

Relevance of open magnetic resonance imaging position (sitting and standing) to quantify pelvic organ prolapse in women

Abdulaziz

Kavanagh

Stothers

et al. 2018

CUAJ

Self Cite

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In pelvic organ prolapse (POP), posture and gravity impact organ position and symptom severity. The advanced magnet configuration in open magnetic resonance imaging (MRO) allows patients to be imaged when sitting and standing, as well in a conventional supine position. This study evaluated if sitting and standing MRO images are relevant as a means of improving quantification of POP because they allow differences in organ position not seen on supine imaging to be identified. Methods: Forty women recruited from a university urogynecology clinic had MRO imaging (0.5 T scanner) with axial and sagittal T2-weighted pelvic scans obtained when sitting, standing, and supine. Pelvic reference lines were used to quantify the degree of POP, and the relevance of imaging position on the detection of POP compared. Results: Images from 40 participants were evaluated (20 with POP and 20 asymptomatic controls). Our results indicate that the maximal extent of prolapse is best evaluated in the standing position using H line, M line, mid-pubic line, and perineal line as reference lines to determine POP. Conclusions: MRO imaging of symptomatic patients in a standing position is relevant in the quantification of POP. Compared with supine images, standing imaging identifies that greater levels of downward movement in the anterior and posterior compartments occur, presumably under the influence of posture and gravity. In contrast, no appreciable benefit was afforded by imaging in the sitting position, which precluded use of some reference lines due to upward movement of the anorectal junction.

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Methodology for 3D image reconstruction of the female pelvis from upright open MRI (MRO) 2D imaging

Cited by 2 publications

References 29 publications

Low‐field MRI: An MR physics perspective

Low‐field MRI: An MR physics perspective

Relevance of open magnetic resonance imaging position (sitting and standing) to quantify pelvic organ prolapse in women

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