明显
发表于 2025-3-21 17:09:07
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眨眼
发表于 2025-3-21 23:48:15
Factors Affecting the Signal-to-Noise Ratio,he fact that the MR signal can be disturbed by a feature called “noise”. The following factors contribute to image noise:.The interaction between the MR signal and the noise level is characterised by the “.”. Mathematically, the SNR is the ratio of the signal intensity from a “.” . divided by the st
烦忧
发表于 2025-3-22 03:21:38
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nutrition
发表于 2025-3-22 05:49:57
Techniques for Imaging the Vascular System,tivity of MR techniques for flow effects. “.” MR angiography (MRA) is based on the induction of signal suppression by flowing spins in combination with conventional spin-echo sequences (see “outflow effect”). This technique does not image the endoluminal vessel morphology well. Its importance is bas
摇曳的微光
发表于 2025-3-22 12:47:32
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Influx
发表于 2025-3-22 14:09:36
Safety, Risks and Contraindications,tic field bears great risks for both female and male patients, as well as for the staff operating the magnet. Ferromagnetic items in the vicinity of the magnet are particularly hazardous. They can become dangerous missiles (“missile effect”).
渐变
发表于 2025-3-22 19:54:16
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squander
发表于 2025-3-22 21:37:35
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针叶树
发表于 2025-3-23 04:24:32
Factors Affecting the Signal-to-Noise Ratio,MR signal and the noise level is characterised by the “.”. Mathematically, the SNR is the ratio of the signal intensity from a “.” . divided by the standard deviation of the signal intensity from a region outside the imaged body region or object (i.e. a tissue region not emitting a signal).
生锈
发表于 2025-3-23 06:08:41
Parallel Imaging,isition. The imaging time for all fast sequences depends crucially on the strength and switching rate of the frequency gradient and the phase encoding gradient. Very rapid switching of strong gradient fields may lead to irritation of nerve cells. This sets physiological limits to ever stronger and faster gradient systems.