Titlebook: Cardiovascular MR Manual; Sven Plein,John Greenwood,John Phillip Ridgway Book 20111st edition Springer-Verlag London Limited 2011 Diagnost

受辱

被詛咒的人

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.

充滿人

調(diào)味品

HUSH

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

門閂

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

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

按時(shí)間順序

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.