Hip imaging of avascular necrosis at 7 Tesla compared with 3 Tesla

Theysohn, JM; Kraff, Oliver; Theysohn, Nina; Orzada, Stephan; Landgraeber, Stefan; Ladd, Mark E.; Lauenstein, TC

doi:10.1007/s00256-014-1818-5

Cited by 18 publications

(10 citation statements)

References 40 publications

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“…However, further research is needed to discover the full potential of this technique which could be applied in pre-collapse stages. In two different papers, Theysohn et al(55,56) analyzed 7T advantages and compared it to 3T magnets. Images obtained using a home-made coil, were judged according to a 4 point scale.…”

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confidence: 99%

The role of imaging in diagnosis and management of femoral head avascular necrosis

Manenti

Altobelli

Pugliese

et al. 2015

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SummaryThe aim of this paper is to critically review the literature documenting the imaging approach in adult Femoral Head Avascular Necrosis (FHAVN). For this purpose we described and evaluated different radiological techniques, such as X-ray, Computed Tomography (CT), Magnetic Resonance Imaging (MRI), and Nuclear Medicine. Plain films are considered the first line imaging technique due to its ability to depict femoral head morphological changes, to its low costs and high availability. CT is not a routinely performed technique, but is useful to rule out the presence of a subchondral fracture when MRI is doubtful or contraindicated. MRI is unanimously considered the gold standard technique in the early stages, being capable to detect bone marrow changes such as edema and sclerosis. It may be useful also to guide treatment and, as CT, it is a validated technique in follow-up of patients with FHAVN. Nuclear medicine imaging is mostly applied in post-operative period to detect graft viability or infective complications. More advanced techniques may be useful in particular conditions but still need to be validated; thus new research trials are desirable. In conclusion, X-ray examination is the first line approach, but lacks of sensitivity in early stage whereas MRI is indicated. CT easily depicts late stage deformation and may decrease MRI false positive results in detecting the subchondral fracture. However, the role of both Nuclear Medicine Imaging and advanced MR techniques in FHAVN still need to be investigated.

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confidence: 99%

The role of imaging in diagnosis and management of femoral head avascular necrosis

Manenti

Altobelli

Pugliese

et al. 2015

ccmbm

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“…Sundberg et al [31] reported that 3.0-T MRI was as effective as 1.5-T d-MRA at detecting labral tears in all subjects. High-resolution T2*-weighted imaging, such as MERGE, is used to obtain detailed anatomical information on the cartilage or labrum in the hip and other joints [32]. Furthermore, spinal imaging with MERGE has shown high sensitivity for depicting edematous and hemorrhagic changes [33] as well as excellent depiction of soft tissue structures such as intervertebral discs and the ligamentum flavum in degenerative diseases of the cervical spine [34].…”

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confidence: 99%

Magnetic resonance imaging findings compared with histological findings of the labrum in hip osteoarthritis

et al. 2015

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“…In a recently published study, Theysohn et al . presented the first comparison study between 3 and 7 T in 13 patients suffering from avascular necrosis of the femoral head, treated using advanced core decompression. Two radiologists evaluated the MR protocol consisting of multi‐echo data image combination (MEDIC), dual‐echo steady‐state (DESS), PD/T2w TSE, T1w TSE and short‐time inversion recovery (STIR), in which the sequence parameters and resolution were kept identical for 3 and 7 T. The assessed items were subjective image quality, soft tissue contrasts, B 1 homogeneity and depiction of imaging abnormalities of the femoral heads.…”

Section: Whole‐body Imaging – Clinical Comparison Studies Between 3 Tmentioning

confidence: 99%

Clinical applications at ultrahigh field (7 T). Where does it make the difference?

et al. 2015

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Presently, three major MR vendors provide commercial 7-T units for clinical research under ethical permission, with the number of operating 7-T systems having increased to over 50. This rapid increase indicates the growing interest in ultrahigh-field MRI because of improved clinical results with regard to morphological as well as functional and metabolic capabilities. As the signal-to-noise ratio scales linearly with the field strength (B0 ) of the scanner, the most obvious application at 7 T is to obtain higher spatial resolution in the brain, musculoskeletal system and breast. Of specific clinical interest for neuro-applications is the cerebral cortex at 7 T, for the detection of changes in cortical structure as a sign of early dementia, as well as for the visualization of cortical microinfarcts and cortical plaques in multiple sclerosis. In the imaging of the hippocampus, even subfields of the internal hippocampal anatomy and pathology can be visualized with excellent resolution. The dynamic and static blood oxygenation level-dependent contrast increases linearly with the field strength, which significantly improves the pre-surgical evaluation of eloquent areas before tumor removal. Using susceptibility-weighted imaging, the plaque-vessel relationship and iron accumulation in multiple sclerosis can be visualized for the first time. Multi-nuclear clinical applications, such as sodium imaging for the evaluation of repair tissue quality after cartilage transplantation and (31) P spectroscopy for the differentiation between non-alcoholic benign liver disease and potentially progressive steatohepatitis, are only possible at ultrahigh fields. Although neuro- and musculoskeletal imaging have already demonstrated the clinical superiority of ultrahigh fields, whole-body clinical applications at 7 T are still limited, mainly because of the lack of suitable coils. The purpose of this article was therefore to review the clinical studies that have been performed thus far at 7 T, compared with 3 T, as well as those studies performed at 7 T that cannot be routinely performed at 3 T. Copyright © 2015 John Wiley & Sons, Ltd.

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Hip imaging of avascular necrosis at 7 Tesla compared with 3 Tesla

Abstract: 7-T hip MRI showed comparable results in hip joint imaging compared with 3 T with slight advantages in contrast detail (cartilage defects) and fluid detection at 7 T when accepting image degradation medially.

Cited by 18 publications

References 40 publications

The role of imaging in diagnosis and management of femoral head avascular necrosis

The role of imaging in diagnosis and management of femoral head avascular necrosis

Magnetic resonance imaging findings compared with histological findings of the labrum in hip osteoarthritis

Clinical applications at ultrahigh field (7 T). Where does it make the difference?

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