Is Dedicated Extremity 1.5-T MRI Equivalent to Standard Large-Bore 1.5-T MRI for Foot and Knee Examinations?

Sutter, Reto; Tresch, Florian; Buck, Florian M.; Pfirrmann, Christian W. A.

doi:10.2214/ajr.14.12738

Cited by 10 publications

(6 citation statements)

References 30 publications

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“…Dedicated extremity scanners have demonstrated several advantages, including reduced noise and high patient comfort, making them an attractive option for focused joint examinations. In addition, these scanners have a more economical profile and offer a degree of portability, facilitating their use in different clinical settings [32][33][34].…”

Section: Mri In Musculoskeletal Imagingmentioning

confidence: 99%

MR-Imaging in Osteoarthritis: Current Standard of Practice and Future Outlook

et al. 2023

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Osteoarthritis (OA) is a common degenerative joint disease that affects millions of people worldwide. Magnetic resonance imaging (MRI) has emerged as a powerful tool for the evaluation and monitoring of OA due to its ability to visualize soft tissues and bone with high resolution. This review aims to provide an overview of the current state of MRI in OA, with a special focus on the knee, including protocol recommendations for clinical and research settings. Furthermore, new developments in the field of musculoskeletal MRI are highlighted in this review. These include compositional MRI techniques, such as T2 mapping and T1rho imaging, which can provide additional important information about the biochemical composition of cartilage and other joint tissues. In addition, this review discusses semiquantitative joint assessment based on MRI findings, which is a widely used method for evaluating OA severity and progression in the knee. We analyze the most common scoring methods and discuss potential benefits. Techniques to reduce acquisition times and the potential impact of deep learning in MR imaging for OA are also discussed, as these technological advances may impact clinical routine in the future.

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Section: Mri In Musculoskeletal Imagingmentioning

confidence: 99%

MR-Imaging in Osteoarthritis: Current Standard of Practice and Future Outlook

et al. 2023

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“…No organ-dedicated or tailored imaging systems for nuclear medicine applications is currently available to image lower extremities. By comparison, several CT and MRI systems for extremity imaging are specifically designed for hands, feet, ankles, and knees, and they are routinely used in clinical practice (Chung et al 2011 , Carrino et al 2014 , Sutter et al 2014 ).…”

Section: Introductionmentioning

confidence: 99%

Design and development of the DE-SPECT system: a clinical SPECT system for broadband multi-isotope imaging of peripheral vascular disease

Zannoni,

Sankar,

Jin

et al. 2024

Phys. Med. Biol.

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Objective Peripheral Vascular Disease (PVD) affects more than 230 million people worldwide and is one of the leading causes of disability among people over age 60. Nowadays, PVD remains largely underdiagnosed and undertreated, and requires the development of tailored diagnostic approaches. We present the full design of the Dynamic Extremity SPECT (DE-SPECT) system, the first organ-dedicated SPECT system for lower extremity imaging, based on 1-cm thick Cadmium Zinc Telluride (CZT) spectrometers and a dynamic dual field-of-view (FOV) synthetic compound-eye collimator. ApproachThe proposed DE-SPECT detection system consists of 48 1-cm thick 3D-position-sensitive CZT spectrometers arranged in a partial ring of 59 cm in diameter in a checkerboard pattern. The detection system is coupled with a compact dynamic synthetic compound-eye (SCE) collimator that allows the user to select between two different FOVs at any time during an imaging study: a wide-FOV (28-cm diameter) configuration for dual-leg or scout imaging or a high-resolution and high-sensitivity (HR-HS) FOV (16-cm diameter) for single-leg or focused imaging. Main ResultsThe preliminary experimental data show that the CZT spectrometer achieves a 3D intrinsic spatial resolution of <0.75 mm FWHM and an excellent energy resolution over a broad energy range (2.6 keV FWHM at 218 keV, 3.3 keV at 440 keV). From simulations, the wide-FOV configuration offers a 0.034% averaged sensitivity at 140 keV and <8 mm spatial resolution, whereas the HR-HS configuration presents a peak central sensitivity of 0.07% at 140 keV and a ~5 mm spatial resolution. The dynamic SCE collimator enables the capability to perform joint reconstructions that would ensure an overall improvement in imaging performance.SignificanceThe DE-SPECT system is a stationary and high-performance SPECT system that offers an excellent spectroscopic performance with a unique computer-controlled dual-FOV imaging capability, and a relatively high sensitivity for multi-tracer and multi-functional SPECT imaging of the extremities.

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“…Its weight of about 500 kg which limits its transportability. Low-field extremity MRI scanners are specifically used for imaging leg, hand, arm, or foot [7]. They are useful to diagnose problems with muscles, bones, joints, nerves or blood vessels.…”

Section: Introductionmentioning

confidence: 99%

Design and test of an open portable MRI system

Chauviere

Belguerras

Lubin

et al. 2022

COMPEL

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Purpose The purpose of this paper is the design study and realisation of portable low-field open MRI system. Design/methodology/approach The design of the magnetic resonance imaging (MRI) system is based on an optimization study using a genetic algorithm. Non-linear two-dimensional and three-dimensional numerical electromagnetic models are developed and inserted in the optimization environment. Findings The results are found to be consistent with those issued from fully experimental tests. The static field produced by the device is 0.295 T with a homogeneity of 2.8% (28,000 ppm) over 100 mm diameter sphere volume. The z-axis gradient coils are capable of generating switching gradients with an amplitude of 8 mT/m and a frequency of 1.2 kHz. Originality/value Our system is an open portable MRI which can be used in an ambulance. The open topology permits an easy access into the lateral sides when a surgery using surgical instrument with video feedback is needed.

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Is Dedicated Extremity 1.5-T MRI Equivalent to Standard Large-Bore 1.5-T MRI for Foot and Knee Examinations?

Cited by 10 publications

References 30 publications

MR-Imaging in Osteoarthritis: Current Standard of Practice and Future Outlook

MR-Imaging in Osteoarthritis: Current Standard of Practice and Future Outlook

Design and development of the DE-SPECT system: a clinical SPECT system for broadband multi-isotope imaging of peripheral vascular disease

Design and test of an open portable MRI system

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