Cuisine
发表于 2025-3-28 16:22:52
Frequency GradientSo far, we have shown how we select an image plane, which represents only the first of the three coordinates that we must specify. To complete our image, we must understand how the other two orthogonal gradients specify the other two coordinates of each point in a given plane.
殖民地
发表于 2025-3-28 20:46:03
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instulate
发表于 2025-3-28 23:40:55
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Oversee
发表于 2025-3-29 06:31:27
The Phase Encoding Gradientor the y axis, and the computer would get confused and render us an improper image reconstruction. So we must do something else, and in fact, all commercial scanners available today make use of “phase encoding”. This rather difficult concept will now be explained in depth.
背带
发表于 2025-3-29 08:19:06
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疾驰
发表于 2025-3-29 13:42:29
Some other Pulse Cycles and Proceduresstanding of what they mean. And in fact, the author wishes to point out that at least one MR equipment vendor had for some time caused confusion by using the term “partial saturation” to refer to its T1 weighted single echo spin-echo. Fortunately, this has been rectified.
PRE
发表于 2025-3-29 19:34:26
Motion already learned, this may not always be possible because of the complexity of this subject. However, we will be able to explain most things; and we will be sure to acknowledge those instances where we fall short of an adequate explanation.
思考才皱眉
发表于 2025-3-29 23:22:35
Book 19922nd editiond be understood without a sophisticated physics or mathematics back ground. That is still my goal. However, in the interim, it has become clear to me that many magnetic resonance techniques that we now routinely use are inadequately understood by many of us. Therefore, I have re-structured and expa
易受刺激
发表于 2025-3-30 00:54:07
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极为愤怒
发表于 2025-3-30 06:08:46
Radiofrequency Pulseticle or a magnetizable substance would experience will vary in time from a maximum in one direction to a maximum in the opposite direction. It turns out that this variation in time can be mathematically described with a simple sine or cosine function.