搜索结果: 1-10 共查到“生物医学工程学其他学科 MRI”相关记录10条 . 查询时间(0.218 秒)
Metal-free MRI contrast agent could be safer for some patients
Metal-free MRI contrast agent safer for some patients
2017/7/24
To enhance the visibility of organs as they are scanned with magnetic resonance imaging (MRI), patients are usually injected with a compound known as a contrast agent before going into the scanner. Th...
二型糖尿病是一种常见的以高血糖为特征的代谢疾病，其对大脑的影响主要表现在神经反应速度的减慢和思维灵活度的减弱。研究表明，由于胰岛素耐受性和患者血糖水平等因素会引起脑部的认知损伤，糖尿病不仅会加速认知功能的退化同时也会增加患者得阿兹海默病（老年痴呆）的风险。脑部胰岛素受体表达的减弱会阻碍胰岛素信号的传递，同时，脑脊液中的胰岛素水平也会对认知功能产生影响。临床研究发现，患有糖尿病的患者更容易患阿兹海默...
Estimating intensity variance due to noise in registered images: applications to DT-MRI
intensity variance noise registered images DT-MRI
2009/12/23
Estimating intensity variance due to noise in registered images: applications to DT-MRI.
Magnetic Field Distribution and Signal Decay in Functional MRI in Very High Fields (up to 9.4 T) Using Monte Carlo Diffusion Modeling
Functional MRI Diffusion Modeling
2009/9/7
Extravascular signal decay rate R2 or R2∗ as a function of blood oxygenation, geometry, and field strength was calculated using a Monte Carlo (MC) algorithm for a wider parameter range than hith...
A pseudorandom, velocity-insensitive, volumetric k-space sampling trajectory is designed for use with balanced steady-state magnetic resonance imaging. Individual arcs are designed independently and d...
Suppression of MRI Truncation Artifacts Using Total Variation Constrained Data Extrapolation
Variation Constrained Data Extrapolation MRI
2009/9/4
The finite sampling of k-space in MRI causes spurious image artifacts, known as Gibbs ringing, which result from signal truncation at the border of k-space. The effect is especially visible for acquis...
Anatomical evaluation of CT-MRI combined femoral model
Anatomical evaluation CT-MRI femoral model
2010/2/25
This study revealed that the local 2D contour-based measurement of matching deviation was 0.5 ± 0.3 mm in the femoral condyle, and in the middle femoral shaft. The global 3D contour matching deviation...
Finite volume analysis of temperature effects induced by active MRI implants: 2. Defects on active MRI implants causing hot spots
temperature effects active MRI implants hot spots
2010/2/26
The analytical solution as worst case scenario as well as the finite volume analysis for near worst case situations show not negligible volumes with critical temperature increases for part of the mode...
Reference signal extraction from corrupted ECG using wavelet decomposition for MRI sequence triggering: application to small animals
corrupted ECG wavelet decomposition small animals
2010/2/26
The efficiency of the presented method has been tested on a group of quite representative signals containing: highly contaminated (mean SNR<-5 dB) simulated ECGs that replicate normal and pathological...
Finite volume analysis of temperature effects induced by active MRI implants with cylindrical symmetry: 1. Properly working devices
temperature effects active MRI cylindrical symmetry
2010/3/1
The results show dangerous heating for the assumed "worst-case scenario" only for constructions not acceptable for vascular implants. Realistic devices are safe with respect to temperature increases. ...