28 channel knee coil

Manufactured by Siemens

Sourced in Germany

The 28-channel knee coil is a piece of medical imaging equipment designed for MRI scans of the knee. It provides high-quality image capture to support clinicians in diagnosing and monitoring knee-related conditions.

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Lab products found in correlation

7 t mri scanner, by Siemens (1 mentions)

4 protocols using 28 channel knee coil

High-Resolution MRI of Amputated Limbs

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Amputated limbs were harvested immediately after surgery from five patients. Legs were set up in the MRI scanner mimicking a clinical setup. All images were acquired at a Food and Drug Administration (FDA) approved clinical 7T MRI scanner (Siemens Healthineers, Erlangen, Germany) with a single-transmit 28-channel knee coil. The duration of the MRI examination was less than one hour which may be considered tolerable in a clinical setting. The MRI protocol included UTE, T1w and T2w sequences acquired sagittally with the following parameters. UTE (pointwise-encoding time reduction with radial acquisition (PETRA)): field of view (FOV): 150 mm, phase FOV 100%, in-plane resolution 0.2 × 0.2 mm, slice thickness: 0.2 mm, repetition time (TR) 10 ms, echo time (TE) 0.07 ms, flip angle (FA) 4. T2-weighted (Double Echo Steady State (DESS): FOV 160 mm, phase FOV 87.5%, slice thickness 0.2 mm, TR 12.57 ms, TE 6 ms, FA 25, water excitation, 512 slices). T1-weighted (: three-dimensional (3D) Fast Low-Angle Shot (FLASH): FOV 160 mm, phase FOV 87.6%, in-plane resolution 0.2 × 0.2 mm, slice thickness 0.2 mm, TR 9.5 ms, TE 4.09 ms, FA 7, Generalized Auto-Calibrating Partially Parallel Acquisitions (GRAPPA) 2, phase encode direction A >> P, 512 slices, water excitation).

Csore J., Karmonik C., Wilhoit K., Buckner L, & Roy T.L. (2023). Automatic Classification of Magnetic Resonance Histology of Peripheral Arterial Chronic Total Occlusions Using a Variational Autoencoder: A Feasibility Study. Diagnostics, 13(11), 1925.

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High-Resolution Diffusion Tensor Imaging of Fiber Bundles

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Imaging was performed at 16 °C on a 7 T Siemens clinical whole- body MRI scanner using a 28 channel knee coil. A high resolution (1 mm × 1 mm × 1 mm) MPRAGE image was first acquired to locate the presence of any air bubbles within the fiber bundle to determine where best to place the diffusion tensor imaging slices. DTI was carried out using the stimulated echo acquisition mode (STEAM) sequence which allows for long diffusion times while minimizing echo attenua tion caused by T₂ relaxation. Twenty five measurements were performed at b values of 0 and 1 ms/μm² in 20 directions, each with a constant TE = 68 ms, δ = 17.5 ms, and a TM ranging from 10 ms to 980 ms, corresponding to diffusion times t = TE/2 + TM of 44 ms to 1014 ms. Two slices of resolution 2.2 mm × 2.2 mm × 10 mm were used. The fiber bundle was placed parallel to the B₀ field to eliminate the possibility of susceptibility-induced internal field inhomogeneities produced by the fibers.

Burcaw L.M., Fieremans E, & Novikov D.S. (2015). Mesoscopic structure of neuronal tracts from time-dependent diffusion. NeuroImage, 114, 18-37.

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High-resolution structural and functional MRI at 7T

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Experiments were conducted using a 7T MRI scanner (Terra, Siemens Healthineers) with a 28-channel knee coil (inner diameter, 15.4 cm). Structural images were acquired using a magnetization-prepared 2 rapid acquisition gradient echoes (MP2RAGE) sequence (TR = 4.3 s; TE = 2.12 ms; slice thickness = 0.5 mm iso). BOLD and MION-enhanced CBV data were collected using a gradient-echo echoplanar imaging (GRE-EPI) sequence (TR = 1.5 s; TE = 20 ms; slice thickness = 0.9 mm iso; 52 slices) with whole-brain coverage.

Baeg E., Doudlah R., Swader R., Lee H., Han M., Kim S.G., Rosenberg A, & Kim B. (2021). MRI Compatible, Customizable, and 3D-Printable Microdrive for Neuroscience Research. eNeuro, 8(2), ENEURO.0495-20.2021.

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Magnetic Resonance Imaging of Postnatal Porcine Limbs

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Limbs were allowed to thaw at room temperature prior to imaging. All limbs were imaged while constrained to full extension (~40° of flexion in the pig) using MRI scanners at the Biomedical Research Imaging Center (BRIC) at the University of North Carolina–Chapel Hill. Due to the small size of the newborn hind limbs and the need for smaller voxel sizes than available on the primary 7.0T scanner, imaging for this group was performed using a 9.4-Tesla Bruker BioSpec 94/30 USR machine (Bruker BioSpin Corp, Billerica, MA) with a 3D fast low angle shot scan sequence (3D-FLASH, flip angle: 10°, TR: 38 ms, TE: 4.42 ms, acquisition time: 13 hours 18 minutes, FOV: 30 x 30 x 30 mm) using a 35 mm volume coil and isotropic voxels of 0.1 x 0.1 x 0.1 mm with no gap between slices. Limbs from the older age groups (1.5 to 18 months) were imaged using a 7.0-Tesla Siemens Magnetom machine (Siemens Healthineers, Erlangen, Germany) with a double echo steady state (DESS, flip angle: 25°, TR: 17 ms, TE: 6 ms, acquisition time: 24 minutes, FOV: 123 x 187 x 102 mm) using a 28 channel knee coil (Siemens Healthineers) and voxels of 0.42 x 0.42 x 0.4 mm with no gap between slices.

Cone S.G., Piercy H.E., Lambeth E.P., Ru H., Piedrahita J.A., Spang J.T., Fordham L.A, & Fisher M.B. (2019). Tissue-specific changes in size and shape of the ligaments and tendons of the porcine knee during post-natal growth. PLoS ONE, 14(10), e0219637.

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