broach
发表于 2025-3-21 18:41:48
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格言
发表于 2025-3-21 20:22:10
978-3-319-20939-5Springer International Publishing 2015
Forsake
发表于 2025-3-22 01:36:11
Sven Plein,John Greenwood,John P. RidgwayCovers highly clinically relevant diagnostic modality in a thorough yet compact style.Rapidly increasing educational market in this diagnostic field.Complex subject conveyed in simplified, portable fo
PACT
发表于 2025-3-22 06:49:22
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美丽的写
发表于 2025-3-22 10:44:49
https://doi.org/10.1007/978-3-642-30696-9c field that can be rapidly switched on and off and a radiofrequency (RF) magnetic field. A typical MRI system therefore consists of three main components that generate these three fields; the main magnet, the gradient coil assembly and the integral rf body transmitter coil. The most common main mag
牢骚
发表于 2025-3-22 12:59:15
https://doi.org/10.1007/978-3-642-30696-9ectrical noise from interfering with the MR signal. The main magnet also generates a magnetic fringe field that is always present and extends well beyond the outside the magnet. This can create an extremely hazardous environment unless control measures are put in place. The general public are exclud
牢骚
发表于 2025-3-22 17:23:10
https://doi.org/10.1007/978-3-642-30696-9ty known as Nuclear Spin. This combined with the proton’s positive charge gives rise to a small magnetic field, known as a magnetic moment. In the presence of the externally applied B. field, the magnetic moments tend to align either with or against the externally applied magnetic field. An equilibr
讥讽
发表于 2025-3-22 23:21:23
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GLOOM
发表于 2025-3-23 01:56:04
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小平面
发表于 2025-3-23 09:04:45
https://doi.org/10.1007/978-3-642-30696-9 in sequence onto the static magnetic field in three orthogonal directions. Each gradient field varies the magnetic field, and therefore the Larmor frequency, along the direction in which it is applied. The slice selection gradient is applied at the same time as the RF pulse, causing resonance in a