نتایج جستجو برای: brain mra
تعداد نتایج: 476375 فیلتر نتایج به سال:
Purpose: Since the introduction of magnetic resonance imaging (MRI) in clinical routine vascular imaging always has been a challenge. Early MR angiography (MRA) techniques were based on intrinsic contrast mechanisms related to blood (non CE techniques). The development of contrast enhanced (CE) MRA techniques using gadolinium based contrast agents (GBCA) substantially changed vascular MR applic...
Introduction In MR angiography (MRA), techniques are mainly divided into contrast-enhanced MRA and non-contrast MRA. Various non-contrast MRA techniques are clinically useful and widely used in routine examinations, such as 3D TOF [1] in intracranial region, phase shift [2] for flow quantification, arterial spin labeling [3,4] in pulmonary vessels [5,6], and balanced SSFP [7] in bright blood ca...
The combination of 3T and parallel-acquisition techniques holds promise for improved performance of contrast-enhanced MR angiography (MRA), in terms of speed, spatial resolution, and coverage. We present a comparison of 2 MRA techniques, including time-of-flight (TOF) and contrast-enhanced MRA, for detection and evaluation of intracranial aneurysms. Our results show that contrast-enhanced MRA w...
BACKGROUND AND PURPOSE In proximal anterior circulation occlusive strokes, collateral flow is essential for good outcome. Collateralized vessel intensity in TOF- and contrast-enhanced MRA is variable due to different acquisition methods. Our purpose was to quantify collateral supply by using flow-weighted signal in TOF-MRA and blood volume-weighted signal in contrast-enhanced MRA to determine e...
BACKGROUND Aldosterone (ALD) has been shown to stimulate cardiac collagen synthesis and fibroblast proliferation via activation of local mineralocorticoid receptors. In patients with acute myocardial infarction, we demonstrated that ALD was extracted through the infarct heart and extracting ALD-stimulated post-infarct left ventricular (LV) remodeling. METHODS AND RESULTS To evaluate the effec...
The clinical manifestations of cerebral lupus vasculitis have a wide spectrum severity which can result in different prognoses. Therefore, its diagnosis and treatment remain challenging without specific guidelines. A 49-year-old woman with systemic erythematosus presented transient left side paresthesia dysarthria lasting 20 minutes. Brain magnetic resonance imaging (MRI) showed multifocal diff...
Fig. 5. MIP MRA of hands. m1 = 98 mT۠ms/m. Fig. 6. MIP MRA of feet with 3D reformati on. m1= 292 mT۠ms/ m. Fig. 7. MIP MRA of carotids. m1= 28 mT۠ms /m. Fig. 4. MIP of three-station MRA of lower extremities. Major arterial banches are depicted. Minor venous signal are observed in the thigh. Signal loss at pelvis is most likely due to respiratory motion and bowel peristalsis. m1=17-52 mT۠ms/m. Flow-...
The present paper provides general dentists with an introduction to the clinical applications and significance of magnetic resonance angiography (MRA) in the oral and maxillofacial regions. Specifically, the method and characteristics of MRA are first explained using the relevant MR sequences. Next, clinical applications to the oral and maxillofacial regions, such as identification of hemangiom...
In this note, we segment and topologically classify brain vessel data obtained from magnetic resonance angiography (MRA). The segmentation is done adaptively and the classification by means of cubical homology, i.e. the computation of homology groups. In this way the number of connected components (measured by H0), the tunnels (given by H1) and the voids (given by H2) are determined, resulting ...
A 50 year old male with obstructive sleep apnea developed de novo, daily, intense, continuous, left side pounding headache with superimposed stabbing pains, fluctuating in severity. Headache was associated with ptosis of the left eye, left hypoglossal palsy and eventual tongue hemiatrophy, in the absence of papilledema. His Brain and neck imaging procedures (MRI, MRA, MRV) and a left temporal a...
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