受辱
发表于 2025-3-23 11:14:57
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被诅咒的人
发表于 2025-3-23 14:38:00
https://doi.org/10.1007/978-3-642-30696-9tion pulse that is normally 90°, so at each excitation pulse all of the . magnetization is transferred into the transverse plane. This combined with the refocusing pulse gives the largest possible signal provided the magnetization is allowed to recover sufficiently between repetitions.
充满人
发表于 2025-3-23 19:54:43
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调味品
发表于 2025-3-24 01:01:22
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HUSH
发表于 2025-3-24 05:59:37
Gradient Echo Versus Spin Echotion pulse that is normally 90°, so at each excitation pulse all of the . magnetization is transferred into the transverse plane. This combined with the refocusing pulse gives the largest possible signal provided the magnetization is allowed to recover sufficiently between repetitions.
Fibrillation
发表于 2025-3-24 09:12:49
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门闩
发表于 2025-3-24 14:35:42
Making an Image: Locating and Encoding Signals in Space and measured in the presence of magnetic field gradients therefore contain spatial information that can be used to build up an image. The sections that follow describe the most commonly used method to build up a cross-sectional image (or image slice) using rf pulses and gradient magnetic fields.
prostatitis
发表于 2025-3-24 18:38:22
https://doi.org/10.1007/978-3-540-70609-0chosen direction and is measured in units of milliTesla per meter (mT/m). A radiofrequency (RF) magnetic field that oscillates at a characteristic frequency in the MegaHertz range, the exact value of which is determined by the nominal field strength of the main magnet. This is given the symbol B..
Pepsin
发表于 2025-3-24 20:32:15
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按时间顺序
发表于 2025-3-25 00:53:03
https://doi.org/10.1007/978-3-642-30696-9, this results in a signal void, also known as a “.” or “. appearance. This effect is also known as the ., referring to the “washout” of proton spins form the image slice that would otherwise be refocused and contribute to the spin echo signal.