Overcoming metallic artefacts from orthopaedic wrist volar plating on a low-field MRI scanner

Stecco, Alessandro; Arioli, Roberto; Buemi, Francesco; Parziale, Giuseppe; Trisoglio, Alessandra; Soligo, Eleonora; Cerini, Paolo; Leigheb, Massimiliano; Brambilla, Marco; Nardo, Gerardo Di; Guzzardi, Giuseppe; Carriero, Alessandro

doi:10.1007/s11547-018-0973-5

Cited by 10 publications

(3 citation statements)

References 22 publications

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“…The initial cartilage changes in OA include proteoglycan loss and degeneration of the collagen network, causing increased mobility of water and increased water content [12,13]. In recent years, several quantitative advanced MRI techniques have emerged and have been proved to be feasible and reproducible for the evaluation of these biochemical chondral changes that occur before morphological alterations [14][15][16][17][18][19]. Among these imaging techniques, cartilage T2 relaxation mapping is a well-established analysis for the ultrastructural evaluation of the articular cartilage collagen matrix [20].…”

Section: Introductionmentioning

confidence: 99%

T2-mapping MRI evaluation of patellofemoral cartilage in patients submitted to intra-articular platelet-rich plasma (PRP) injections

et al. 2021

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This study evaluated the ability of T2 mapping magnetic resonance imaging at 3 T, in addition to morphological sequences, to assess efficacy of platelet-rich plasma (PRP) injections, characterizing qualitatively and quantitatively the grade of knee cartilage repair in patients with patellofemoral chondropathy. We retrospectively studied 34 patients (22 men, 12 women, mean age 41.8 years, including 22 men) with patellofemoral knee chondropathy, who underwent intra-articular PRP injections and completed a clinical and instrumental follow-up. As control group, we evaluated 34 patients who underwent non-operative therapy. All patients were submitted to clinical (using VAS and WOMAC index) and imaging studies with 3 T magnetic resonance with cartilage analysis with T2 mapping sequences for cartilage analysis before and after treatment. In the study group, mean pre-treatment T2 relaxation time values were 44.2 ± 2.5 ms, considering all articular cartilage compartments, with significant reduction at the follow-up (p < 0.001). At the index compartment, mean pre-treatment T2 relaxation times values were 47.8 ± 3.6 ms, with statistically significant reduction at the follow-up (p < 0.001). Evaluation of focal cartilage lesions reported pre-treatment mean T2 value of 70.1 ± 13.0 ms and post-treatment mean value of 59.9 ± 4.6 ms (p < 0.001). From a clinical point of view, the pre-treatment WOMAC and VAS scores were 18.3 ± 4.5 and 7 (IQR:6–7.2), respectively; the post-treatment values were 7.3 ± 3.2 and 2 (IQR: 1.7–3.0), respectively (p < 0.001). In the control group, despite clinical improvement, we didn’t find significant T2 values change during the follow-up period. In conclusion, T2 mapping is a valuable indicator for chondropathy and treatment-related changes over time.

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Section: Introductionmentioning

confidence: 99%

T2-mapping MRI evaluation of patellofemoral cartilage in patients submitted to intra-articular platelet-rich plasma (PRP) injections

et al. 2021

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“…Low-field MRI improves visualization of the soft tissues near the metallic hardware, owing to the physics principle that susceptibility artifacts are proportional to the field strength. Although this concept has been shown for smaller metallic implants, 9–11 the current gap of knowledge on larger metallic components, such as hip arthroplasty, stems from poor access to whole-body low-field systems, unavailability of advanced metal artifact reduction techniques on such systems, and often poor image quality of the traditional low-field scanners. Initial studies suggest that new-generation low-field MRI systems offer advantages for MRI-guided catheterizations with metal-containing devices and MRI in high-susceptibility regions 12,13 .…”

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confidence: 99%

New-Generation Low-Field Magnetic Resonance Imaging of Hip Arthroplasty Implants Using Slice Encoding for Metal Artifact Correction

Khodarahmi

Brinkmann²,

Lin

et al. 2022

Invest Radiol

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ObjectivesDespite significant progress, artifact-free visualization of the bone and soft tissues around hip arthroplasty implants remains an unmet clinical need. New-generation low-field magnetic resonance imaging (MRI) systems now include slice encoding for metal artifact correction (SEMAC), which may result in smaller metallic artifacts and better image quality than standard-of-care 1.5 T MRI. This study aims to assess the feasibility of SEMAC on a new-generation 0.55 T system, optimize the pulse protocol parameters, and compare the results with those of a standard-of-care 1.5 T MRI.Materials and MethodsTitanium (Ti) and cobalt-chromium total hip arthroplasty implants embedded in a tissue-mimicking American Society for Testing and Materials gel phantom were evaluated using turbo spin echo, view angle tilting (VAT), and combined VAT and SEMAC (VAT + SEMAC) pulse sequences. To refine an MRI protocol at 0.55 T, the type of metal artifact reduction techniques and the effect of various pulse sequence parameters on metal artifacts were assessed through qualitative ranking of the images by 3 expert readers while taking measured spatial resolution, signal-to-noise ratios, and acquisition times into consideration. Signal-to-noise ratio efficiency and artifact size of the optimized 0.55 T protocols were compared with the 1.5 T standard and compressed-sensing SEMAC sequences.ResultsOverall, the VAT + SEMAC sequence with at least 6 SEMAC encoding steps for Ti and 9 for cobalt-chromium implants was ranked higher than other sequences for metal reduction (P < 0.05). Additional SEMAC encoding partitions did not result in further metal artifact reductions. Permitting minimal residual artifacts, low magnetic susceptibility Ti constructs may be sufficiently imaged with optimized turbo spin echo sequences obviating the need for SEMAC. In cross-platform comparison, 0.55 T acquisitions using the optimized protocols are associated with 45% to 64% smaller artifacts than 1.5 T VAT + SEMAC and VAT + compressed-sensing/SEMAC protocols at the expense of a 17% to 28% reduction in signal-to-noise ratio efficiency. B1-related artifacts are invariably smaller at 0.55 T than 1.5 T; however, artifacts related to B0 distortion, although frequently smaller, may appear as signal pileups at 0.55 T.ConclusionsOur results suggest that new-generation low-field SEMAC MRI reduces metal artifacts around hip arthroplasty implants to better advantage than current 1.5 T MRI standard of care. While the appearance of B0-related artifacts changes, reduction in B1-related artifacts plays a major role in the overall benefit of 0.55 T.

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“…Normal alignment and congruity at the articular surface are important to achieve a good functional outcome [ 7 ]. A study by Kapandji et al presents a technique of internal fixation by pinning for extra-articular distal end radius fractures; however, in unstable or comminuted fractures, these techniques can be followed by secondary displacement with excessive rotation, ultimately resulting in malunion [ 1 , 8 ].…”

Section: Discussionmentioning

confidence: 99%

Reconstructive Surgical Intervention for Malunited Distal End Radius and Ulna Fracture: A Case Report Demonstrating Improved Patient Outcomes

Patel,

Pundkar,

Shrivastava

et al. 2024

Cureus

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This case report explores the efficacy of reconstructive surgical intervention in addressing malunited fractures of the distal end of the radius and ulna. The study presents a detailed analysis of a specific case, highlighting the surgical techniques employed and their impact on patient outcomes. The report emphasizes the importance of precision in addressing malunited fractures and showcases how the intervention led to improved patient outcomes. By documenting this case, the study contributes valuable insights into the field of orthopedic surgery, providing a basis for further research and enhancing the understanding of optimal approaches to managing such complex fractures.

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Overcoming metallic artefacts from orthopaedic wrist volar plating on a low-field MRI scanner

Cited by 10 publications

References 22 publications

T2-mapping MRI evaluation of patellofemoral cartilage in patients submitted to intra-articular platelet-rich plasma (PRP) injections

T2-mapping MRI evaluation of patellofemoral cartilage in patients submitted to intra-articular platelet-rich plasma (PRP) injections

New-Generation Low-Field Magnetic Resonance Imaging of Hip Arthroplasty Implants Using Slice Encoding for Metal Artifact Correction

Reconstructive Surgical Intervention for Malunited Distal End Radius and Ulna Fracture: A Case Report Demonstrating Improved Patient Outcomes

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