L’imagerie de susceptibilité magnétique : théorie et applications

Haddar, D.; Haacke, E. Mark; Sehgal, Vivek; DelProposto, Zachary; Salamon, G; Séror, Olivier; Sellier, N.

doi:10.1016/s0221-0363(04)97759-1

Cited by 39 publications

(15 citation statements)

References 21 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The magnetic susceptibility differences between oxyhemoglobin and deoxyhemoglobin are an important enabling factor for the SWI phenomena. The magnetic susceptibility is the variable that measures the behavior of a substance subjected to the action of a B0 magnetic field [29,30]. In the presence of this field, the substances may be paramagnetic or diamagnetic.…”

Section: Swi (Susceptibility Weighted Image)mentioning

confidence: 99%

The influence of the blood pressure on the venous cerebral flow measured by magnetic susceptibility (SWI) technique

Martins¹,

Carreiras²,

Ribeiro³

et al. 2013

JBiSE

View full text Add to dashboard Cite

Susceptibility Weighted Image (SWI) is a Magnetic Resonance Imaging (MRI) technique that combines high spatial resolution and sensitivity to magnetic susceptibility differences between tissues, it is extremely sensitive to venous blood due to its iron content of deoxyhemoglobin. The aim of this study was to evaluate the differences in the cerebral venous vasculature produced by the value’s variation of blood pressure. 20 subjects (10 hypertensive and 10 normotensive patients) underwent a MRI system with field strength of 1.5 T using a synergy head coil (7 channels). The obtained sequences were T1w, T2w-FLAIR, T2* and SWI. The value of Contrast-to-Noise Ratio (CNR) was assessed in MinIP (Minimum Intensity Projection) and Magnitude images, through drawing free hand ROIs in venous structures: Superior Sagittal Sinus (SSS) Internal Cerebral Vein (ICV) and Sinus Confluence (SC). The obtained values were presented in descriptive statistics-quartiles and extremes diagrams. The results were compared between groups. CNR shown higher values for normotensive group in MinIP (108.89 ± 6.907) to ICV; (238.73 ± 18.556) to SC and (239.384 ± 52.303) to SSS. These values are bigger than images from Hypertensive group about 46 au in average. Comparing the results of Magnitude and MinIP images, there were obtained lower CNR values for the hypertensive group. There were differences in the CNR values between both groups, being these values more expressive in the large vessels-SSS and SC. The SWI is a potential technique to evaluate and characterize the blood pressure variation in the studied vessels adding a physiological perspective to MRI and giving a new approach to the radiological vascular studies.

show abstract

Section: Swi (Susceptibility Weighted Image)mentioning

confidence: 99%

The influence of the blood pressure on the venous cerebral flow measured by magnetic susceptibility (SWI) technique

Martins¹,

Carreiras²,

Ribeiro³

et al. 2013

JBiSE

View full text Add to dashboard Cite

show abstract

“…Computed tomography (CT) imaging is an excellent modality for detecting acute blood products in the subarachnoid, subdural or extradural space. More recently, gradient echo imaging on MR and susceptibility weighted imaging (SWI), a high resolution gradient echo sequence, are even more sensitive in detecting subtle blood products in the brain [ 4 , 5 ] .…”

Section: Intracranial Hemorrhage: Subarachnoid Hemorrhage (Sah) Subdmentioning

confidence: 99%

Neurological complications

Law

2009

Cancer Imaging

View full text Add to dashboard Cite

Patients with neurological malignancies are subject to developing a unique set of complications that require emergent evaluation and treatment. With the increasing incidence of cancer in the general population and improved survival, these emergencies will be more frequently encountered. Physicians must be able to recognize these conditions and institute appropriate therapy after a focused initial evaluation. The approach to definitive therapy is commonly multidisciplinary, involving surgeons, radiation oncologists, medical oncologists, and other medical specialists. Prompt interventions can be lifesaving and may spare patients considerable morbidity and pain. In neuro-oncology, there are some more specific complications and emergencies. The more general complications are not reviewed here.

show abstract

“…Visualization of internal thalamic nuclei is a challenging, if not impossible, task using clinically-available 1.5 or 3 T MRI systems [11], [12], [13]. The use of 7 T MRI with enhanced signal-to-noise ratio (SNR), combined with MR sequences that are more advantageous at higher magnetic field, such as susceptibility-weighted imaging (SWI) [14], [15], [16], has yielded high-resolution images with enhanced contrast, allowing visualization of internal thalamic nuclei in individual patients. However, concerns have been raised as to the validity of these images for stereotactic targeting, due to the possibility of increased distortion at high field [9].…”

Section: Introductionmentioning

confidence: 99%

Feasibility of Using Ultra-High Field (7 T) MRI for Clinical Surgical Targeting

et al. 2012

View full text Add to dashboard Cite

The advantages of ultra-high magnetic field (7 Tesla) MRI for basic science research and neuroscience applications have proven invaluable. Structural and functional MR images of the human brain acquired at 7 T exhibit rich information content with potential utility for clinical applications. However, (1) substantial increases in susceptibility artifacts, and (2) geometrical distortions at 7 T would be detrimental for stereotactic surgeries such as deep brain stimulation (DBS), which typically use 1.5 T images for surgical planning. Here, we explore whether these issues can be addressed, making feasible the use of 7 T MRI to guide surgical planning. Twelve patients with Parkinson's disease, candidates for DBS, were scanned on a standard clinical 1.5 T MRI and a 7 T MRI scanner. Qualitative and quantitative assessments of global and regional distortion were evaluated based on anatomical landmarks and transformation matrix values. Our analyses show that distances between identical landmarks on 1.5 T vs. 7 T, in the mid-brain region, were less than one voxel, indicating a successful co-registration between the 1.5 T and 7 T images under these specific imaging parameter sets. On regional analysis, the central part of the brain showed minimal distortion, while inferior and frontal areas exhibited larger distortion due to proximity to air-filled cavities. We conclude that 7 T MR images of the central brain regions have comparable distortions to that observed on a 1.5 T MRI, and that clinical applications targeting structures such as the STN, are feasible with information-rich 7 T imaging.

show abstract

L’imagerie de susceptibilité magnétique : théorie et applications

Cited by 39 publications

References 21 publications

The influence of the blood pressure on the venous cerebral flow measured by magnetic susceptibility (SWI) technique

The influence of the blood pressure on the venous cerebral flow measured by magnetic susceptibility (SWI) technique

Neurological complications

Feasibility of Using Ultra-High Field (7 T) MRI for Clinical Surgical Targeting

Contact Info

Product

Resources

About