نتایج جستجو برای: mra
تعداد نتایج: 3595 فیلتر نتایج به سال:
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...
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...
BACKGROUND AND PURPOSE The purpose of the present study was to assess the diagnostic usefulness of early diffusion-weighted MRI (DWI) and MR angiography (MRA) in patients with ischemic stroke. Past approaches to stroke diagnosis required a series of diagnostic tests over several days of hospitalization. New magnetic resonance methodologies that include DWI and MRA may allow more rapid character...
BACKGROUND AND PURPOSE Intravoxel phase dispersion and flow saturation often prevent adequate depiction of intracranial giant aneurysms on 3D time-of-flight (3D-TOF) MR angiography (MRA). Additional diagnostic difficulties may arise from T1 contamination artifact of an associated blood clot. Our aim was to assess whether contrast-enhanced MRA could improve the evaluation of giant aneurysms and ...
BACKGROUND AND PURPOSE Flow voids within the cavernous sinuses and/or certain venous drainage on spin-echo MR imaging and time-of-flight (TOF) flow enhancement on MR angiography (MRA) have indicated high-velocity shunt flow and have been used for screening patients with dural arteriovenous fistulas (DAVFs) of the cavernous sinuses. In this investigation, the capabilities of 3D dynamic MRA as a ...
Background PAD is a major cause of morbidity and accurate diagnosis is essential for optimal patient management. ABI measurement is the initial diagnostic test of choice however, accuracy is sometimes limited, e.g. in diabetic patients and with vessel calcification. Additional imaging with CTA, MRA, or DSA is often required prior to revascularization. QISS MRA is a rapid, operator-independent n...
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