Visualization of wrist anatomy—a comparison between 7T and 3T MRI

Götestrand, Simon; Björkman, Anders; Björkman–Burtscher, Isabella M.; Kristiansson, Ingvar; Aksyuk, Elenya; Szaro, Paweł; Bloch, Karin Markenroth; Geijer, Mats

doi:10.1007/s00330-021-08165-5

Cited by 11 publications

(3 citation statements)

References 30 publications

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“…Studies performing compositional MRI techniques at the wrist are rare, which may be related to difficulties in image acquisition and quantification due to the small size of the anatomic structures at the wrist [ 1 ]. Götestrand et al [ 12 ] reported a superior depiction of several anatomical structures, including the articular cartilage and different parts of the TFCC, for 7 T compared with 3 T in a small sample of healthy volunteers, emphasizing the potential of wrist imaging at ultra-high-field MRI [ 23 ]. We recently confirmed these results for cartilage imaging by comparing the image quality between 3- and 7-T MRI in a multi-reader assessment of the current study cohort.…”

Section: Discussionmentioning

confidence: 99%

Variation in cartilage T2 and T2* mapping of the wrist: a comparison between 3- and 7-T MRI

Heiss,

Weber,

Balbach

et al. 2023

Eur Radiol Exp

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Background To analyze regional variations in T2 and T2* relaxation times in wrist joint cartilage and the triangular fibrocartilage complex (TFCC) at 3 and 7 T and to compare values between field strengths. Methods Twenty-five healthy controls and 25 patients with chronic wrist pain were examined at 3 and 7 T on the same day using T2- and T2*-weighted sequences. Six different regions of interest (ROIs) were evaluated for cartilage and 3 ROIs were evaluated at the TFCC based on manual segmentation. Paired t-tests were used to compare T2 and T2* values between field strengths and between different ROIs. Spearman’s rank correlation was calculated to assess correlations between T2 and T2* time values at 3 and 7 T. Results T2 and T2* time values of the cartilage differed significantly between 3 and 7 T for all ROIs (p ≤ 0.045), with one exception: at the distal lunate, no significant differences in T2 values were observed between field strengths. T2* values differed significantly between 3 and 7 T for all ROIs of the TFCC (p ≤ 0.001). Spearman’s rank correlation between 3 and 7 T ranged from 0.03 to 0.62 for T2 values and from 0.01 to 0.48 for T2* values. T2 and T2* values for cartilage varied across anatomic locations in healthy controls at both 3 and 7 T. Conclusion Quantitative results of T2 and T2* mapping at the wrist differ between field strengths, with poor correlation between 3 and 7 T. Local variations in cartilage T2 and T2* values are observed in healthy individuals. Relevance statement T2 and T2* mapping are feasible for compositional imaging of the TFCC and the cartilage at the wrist at both 3 and 7 T, but the clinical interpretation remains challenging due to differences between field strengths and variations between anatomic locations. Key points •Field strength and anatomic locations influence T2 and T2* values at the wrist. •T2 and T2* values have a poor correlation between 3 and 7 T. •Local reference values are needed for each anatomic location for reliable interpretation. Graphical Abstract

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Section: Discussionmentioning

confidence: 99%

Variation in cartilage T2 and T2* mapping of the wrist: a comparison between 3- and 7-T MRI

Heiss,

Weber,

Balbach

et al. 2023

Eur Radiol Exp

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“…This is of interest for the hand and wrist due to the small size of the anatomic structures. While these investigations mainly centered on data from healthy volunteers, without specific emphasis on nerve imaging, comparative studies across various field strengths demonstrate that 7T MRI allows the accurate delineation of nerves, Pacinian corpuscles, ligaments, and vessels, thereby promising an improved diagnosis of pathological conditions [ 10 , 13 ]. Correlation studies between anatomical findings and MRI abnormalities conducted on cadaveric extremities underscore a robust alignment between images and histological observations [ 14 ].…”

Section: Introductionmentioning

confidence: 99%

High-Resolution Magnetic Resonance Neurography at 7T: A Pilot Study of Hand Innervation

Guillemin,

Ferreira Branco,

M’Rad

et al. 2024

Diagnostics

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The emergence of 7T clinical MRI technology has sparked our interest in its ability to discern the complex structures of the hand. Our primary objective was to assess the sensory and motor nerve structures of the hand, specifically nerves and Pacinian corpuscles, with the dual purpose of aiding diagnostic endeavors and supporting reconstructive surgical procedures. Ethical approval was obtained to carry out 7T MRI scans on a cohort of volunteers. Four volunteers assumed a prone position, with their hands (N = 8) positioned in a “superman” posture. To immobilize and maintain the hand in a strictly horizontal position, it was affixed to a plastic plate. Passive B0 shimming was implemented. Once high-resolution 3D images had been acquired using a multi-transmit head coil, advanced post-processing techniques were used to meticulously delineate the nerve fiber networks and mechanoreceptors. Across all participants, digital nerves were consistently located on the phalanges area, on average, between 2.5 and 3.5 mm beneath the skin, except within flexion folds where the nerve was approximately 1.8 mm from the surface. On the phalanges area, the mean distance from digital nerves to joints was approximately 1.5 mm. The nerves of the fingers were closer to the bone than to the surface of the skin. Furthermore, Pacinian corpuscles exhibited a notable clustering primarily within the metacarpal zone, situated on the palmar aspect. Our study yielded promising results, successfully reconstructing and meticulously describing the anatomy of nerve fibers spanning from the carpus to the digital nerve division, alongside the identification of Pacinian corpuscles, in four healthy volunteers (eight hands).

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“…Mavrogenis et al demonstrated that employing bone models derived from CT data and computer-assisted navigation systems has been proven to be an effective technique of surgical assistance [ 6 ]. A 3D visualization of the wrist bones is of therapeutic importance due to the tiny size and complicated anatomical features of them, which are challenging to observe in 2D images [ 7 ]. With 3D carpal models, analyses—e.g., of wrist kinematic behavior—can be directly conducted on a virtual model for therapy planning or surgery assessment [ 8 , 9 ].…”

Section: Introductionmentioning

confidence: 99%

Smoothing the Undersampled Carpal Bone Model with Small Volume and Large Curvature: A Feasibility Study

Praster

et al. 2022

Life

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The carpal bones are eight small bones with irregularities and high curvature on their surfaces. The 3D model of the carpal bone serves as the foundation of further clinical applications, e.g., wrist kinematic behavior. However, due to the limitation of the Magnetic Resonance Imaging (MRI) technique, reconstructed carpal bone models are discretely undersampled, which has dramatic stair-step effects and leads to abnormal meshes on edges or surfaces, etc. Our study focuses on determining the viability of various smoothing techniques for a carpal model reconstructed by in vivo gathered MR images. Five algorithms, namely the Laplacian smoothing algorithm, the Laplacian smoothing algorithm with pre-dilation, the scale-dependent Laplacian algorithm, the curvature flow algorithm, and the inverse distance algorithm, were chosen for evaluation. The assessment took into account the Relative Volume Difference and the Hausdorff Distance as well as the surface quality and the preservation of morphological and morphometric properties. For the five algorithms, we analyzed the Relative Volume Difference and the Hausdorff Distance for all eight carpal bones. Among all the algorithms, the scale-dependent Laplacian method processed the best result regarding surface quality and the preservation of morphological and morphometric properties. Based on our extensive examinations, the scale-dependent Laplacian algorithm is suitable for the undersampled carpal bone model with small volume and large curvature.

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Visualization of wrist anatomy—a comparison between 7T and 3T MRI

Cited by 11 publications

References 30 publications

Variation in cartilage T2 and T2* mapping of the wrist: a comparison between 3- and 7-T MRI

Variation in cartilage T2 and T2* mapping of the wrist: a comparison between 3- and 7-T MRI

High-Resolution Magnetic Resonance Neurography at 7T: A Pilot Study of Hand Innervation

Smoothing the Undersampled Carpal Bone Model with Small Volume and Large Curvature: A Feasibility Study

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