Comparison of Routine Knee Magnetic Resonance Imaging at 3 T and 7 T

Springer, Elisabeth; Bohndorf, Klaus; Juráš, Vladimír; Szomolányi, Pavol; Zbýň, Štefan; Schreiner, Markus; Schmitt, Benjamin; Trattnig, Siegfried

doi:10.1097/rli.0000000000000303

Cited by 34 publications

(27 citation statements)

References 26 publications

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“…Such a boosting effect has been acknowledged in neurological and MSK fields but, to our knowledge not in sarcoma surgery [38]. The higher spatial resolution in UHF MR images have been used for the detection of damaged tissues in meniscal or cartilage pathologies and for the investigation of bone microarchitecture [39][40][41]. The higher resolution provided by UHF MRI might also change the surgical planning for tumors with a very high infiltrative capacity such as myxofibrosarcoma (MFS), Undifferentiated Pleomorphic Sarcomas (UPS) or epithelioid sarcoma [37,42].…”

Section: Discussionmentioning

confidence: 99%

Are We Heading to the Future of Musculoskeletal Tumor Imaging with Ultra-High Field 7T MRI?

Fouré¹,

Rochwerger²,

Troter³

et al. 2020

COR

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Background and objectives: Sarcoma preoperative planning critically depends on MRI, sometimes uninformative when compartments barriers or critical structures are involved. objective: to prospectively assess the feasibility and the potential of 7T MRI in sarcoma. Methods: Two patients with femoral chondrosarcoma were CT and MRI (1.5 and 7T) scanned with T1W, T2W, GRE and DTI sequences. Image quality and characteristics of the tumors were compared between these modalities. Results: In-plane resolution was higher at 7T as compared to 1.5T MRI, tumor delineation was more reliable and soft tissue involvement was clearer. DT imaging and corresponding ADC mapping allowed a clear distinction between edema and tumor and identified tumor involvement of collateral ligament allowing healthy structures sparing with histopathology confirmation. 7T MRI was also able to define cortical reaction as precisely as CT imaging. Conclusion: Musculoskeletal tumours UHF-MRI is promising. Higher resolution and enhanced signal to noise ratio improved tumoral assessment, infiltration and cortex changes. One could expect this nonradiating technique to replace CT investigation for bone tumours assessment and open new perspectives in the fields of vascular or nerve salvage and response to chemo/radiotherapy. Healthy tissue sparing might be facilitated with impacts on function, complication or reconstruction type.

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Section: Discussionmentioning

confidence: 99%

Are We Heading to the Future of Musculoskeletal Tumor Imaging with Ultra-High Field 7T MRI?

Fouré¹,

Rochwerger²,

Troter³

et al. 2020

COR

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“…A recent systemic review and meta-analysis comparing 1.5-T and 3-T MRI for detection of morphological cartilage lesions found both field strength magnets to offer high diagnostic accuracy; however, the 3-T MRI had greater accuracy than the 1.5 T. 13 In 2017, the FDA approved the first 7-T MRI system for clinical diagnostic imaging of the extremities. A comparison of routine clinical knee MRI performed at 3 T and 7 T found diagnostic confidence of radiologists for cartilage defects to be higher with 7 T. 14 In addition to adequate SNR and spatial resolution, detection of cartilage pathology requires optimal cartilage-synovial fluid contrast. The International Cartilage Repair Society (ICRS) protocol for imaging of cartilage includes two-dimensional (2D) fast spin-echo (FSE) or turbo spin-echo (TSE) pulse sequences to obtain fat-suppressed proton-density-weighted, T2-weighted, or intermediate-weighted images.…”

Section: Clinical Mri Of Cartilagementioning

confidence: 99%

Cartilage Imaging in Osteoarthritis

Alizai

Walter

Khodarahmi

et al. 2019

Semin Musculoskelet Radiol

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Osteoarthritis (OA) is the most common joint disease in the United States. The prevalence of OA is rising due to an aging population and increasing rates of obesity. Magnetic resonance imaging (MRI) allows an incomparable noninvasive assessment of all joint structures. Irreversible and progressive degradation of the articular cartilage remains the hallmark feature of OA. To date, attempts at developing disease-modifying drugs or biomechanical interventions for treating OA have proven unsuccessful. MRI-based cartilage imaging techniques have continued to advance, however, and will likely play a central role in the development of these joint preservation methods of the future. In this narrative review, we describe clinical MR image acquisition and assessment of cartilage. We discuss the semiquantitative cartilage scoring methods used in research. Lastly, we review the quantitative MRI techniques that allow assessment of changes in the biochemical composition of cartilage, even before the morphological changes are evident.

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“…However, the effect of this procedure on the cartilage tissue itself is not well investigated. The current gold standard for non-invasive visualization of the hyaline cartilage in vivo is magnetic resonance imaging (MRI) [19][20][21]. In addition to the standard morphological MRI, quantitative biochemical MRI has evolved [19,22].…”

Section: Introductionmentioning

confidence: 99%

Radiofrequency Chondroplasty May Not Have a Long-Lasting Effect in the Treatment of Concomitant Grade II Patellar Cartilage Defects in Humans

Koller

Springer

Rentenberger

et al. 2020

JCM

Self Cite

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The effect of radiofrequency chondroplasty on cartilage tissue is not well studied. This prospective pilot study investigates the effect of radiofrequency chondroplasty on International Cartilage Repair Society (ICRS) grade II patellar cartilage defects using high-resolution magnetic resonance imaging (MRI) with T2 mapping. Six consecutive patients were treated for ICRS grade II patellar cartilage defects using radiofrequency chondroplasty. Before surgery and at defined follow-ups (2 weeks, 4 and 12 months) a high-resolution morphological 3 Tesla MRI with quantitative T2 mapping was performed. At baseline MRI, global T2 values of cartilage defects were increased (46.8 ms ± 9.7) compared to healthy cartilage (35.2 ms ± 4.5) in the same knee which served as reference. Two weeks after treatment, global T2 values (39.2 ms ± 7.7) of the defect areas decreased. However, global T2 values of the defect areas increased beyond the preoperative levels at 4 months (47.4 ms ± 3.1) and 12 months (51.5 ms ± 5.9), respectively. Zonal T2 mapping revealed that the predominant changes in T2 values occurred at the superficial cartilage layer. T2 mapping appears to be an ideal method to monitor cartilage degeneration after chondroplasty. Based on the small sample size of this pilot study, radiofrequency chondroplasty may cause cartilage damage and may not have a long-lasting effect in the treatment of grade II patellar cartilage defects. In five out of six patients, postoperative cartilage damage was observed on quantitative MRI. This study was therefore terminated before completion. We recommend only addressing the pathology which indicated arthroscopy and leaving concomitant cartilage lesions untreated.

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Comparison of Routine Knee Magnetic Resonance Imaging at 3 T and 7 T

Abstract: Ultra-high-field MRI at 7 T improved the overall diagnostic confidence in routine MRI of the knee joint compared with that at 3 T. This is especially true for small joint structures and subtle lesions. Higher spatial resolution was identified as the main reason for this improvement.

Cited by 34 publications

References 26 publications

Are We Heading to the Future of Musculoskeletal Tumor Imaging with Ultra-High Field 7T MRI?

Are We Heading to the Future of Musculoskeletal Tumor Imaging with Ultra-High Field 7T MRI?

Cartilage Imaging in Osteoarthritis

Radiofrequency Chondroplasty May Not Have a Long-Lasting Effect in the Treatment of Concomitant Grade II Patellar Cartilage Defects in Humans

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