Introducing MRI: Spatial Localization and k-space: Review and Q&A (25 of 56)
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http://www.einstein.yu.edu - The twenty-fifth chapter of Dr. Michael Lipton's MRI course covers Spatial Localization and k-space: Review and Q&A. Dr. Lipton is associate professor radiology at Albert Einstein College of Medicine and associate director of its Gruss Magnetic Resonance Research Center.
Comments
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Really Great Lecture!
But I do have one question: The measured signal which contains out of several different frequencies looks like a sine function with an decreasing amplitude (which makes sense). But in the last lecture (Number 23 and 24) the signal was just an exponential decay which rises again after the 180 degree pulse and the measurment of this Echo leads to the symmetric matrix in the k-space. But with the decaying sine signal in this lecture I dont understand how we get an symmetric matrix in the k space (for example because it would have negative values aswell).
So my question is: The combination of the sine waves with different frequencies form a new sine wave and we only detect/calculate the envelope of the signal and write it in the k-space matrix? (But then the fouriertransformation wouldnt lead the right frequencies) -
Does the multiple sampling of the one signal mean that it equals as many TE?
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best study material and way of presentation
41m 35sLenght
23Rating