bme prob set 3 - Carter Lindborg BME131 Problem Set 3 1 a...

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Carter Lindborg BME131 Problem Set 3 1. a. T1 relaxation time is the time constant that describes the time it takes for M 0 to return to its equilibrium value. T2 relaxation time describes the time it takes for the spins to diphase. T2 is always less then or equal to T1. For a proton density weighted image TE(time to echo) is made to be much less then T2 while TR(time to relaxation) is made much greater then T1. For a T1 weighted image TE is much less then T2 while TR is made approximately equal to T1. For a T2 weighted image TE is made approximately equal to T2 while TR is made much greater than T1. These three times of images, T1, T2, and proton density weighted images can then be combined to create an image capable of having color applied to it with the effect of differentiating specific tissue types as well as blood and other bodily fluids. b. Since signal strength is proportional to the equation: M 0 (1-e -TR/T1 ) e -TE/T2 , for equal T1 times, a larger T2 will create a stronger spin echo signal.
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  • Spring '08
  • -2
  • Magnetic resonance imaging, Nuclear magnetic resonance, signal strength, magnetic field gradient, T1 weighted image, linear magnetic field

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