Author Archives: Jeremy Ford

FID Finding: Final Post

In the final two labs our group searched for the Free Induction Decay signal of our mineral oil phantom. In order to do this we altered various parameters and attempted to eliminate sources of noise from our system. The three … Continue reading Continue reading

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FID Finding: Final Post

In the final two labs our group searched for the Free Induction Decay signal of our mineral oil phantom. In order to do this we altered various parameters and attempted to eliminate sources of noise from our system. The three … Continue reading Continue reading

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Pulses and FIDs

We used the gnu radio programming language to create a gradient echo pulse sequence.  In a gradient echo sequence, the net magnetization of spins is knocked down 90° by an initial RF pulse. The spins then lose their transverse magnetization … Continue reading Continue reading

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TR Switch

In MR imaging, the TR switch is an integral part of the hardware system that allows a single circuit to handle both the transmit and receive power of the RF coil.  During the transmit phase, power is supplied to the … Continue reading Continue reading

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Pineapples and Power Amplifiers

  One notable event in the past couple weeks was imaging with our surface coil.  The star coil was hooked up to a 3T scanner and was used to image a mineral oil phantom and a pineapple.  The coil seemed … Continue reading Continue reading

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Tuning and Matching

The first coil that was created was in the shape of a star, as seen in figure 1. In this coil, we have 4 tuning capacitors and a matching capacitor, as shown in the schematic of the final design in … Continue reading Continue reading

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First Lab

First, we used a Hall probe to measure the maximum magnetic field our scanner magnet.  The value was .56 T which results in a center frequency of 23.84 MHz.  This matched the center frequency we measured when using a network … Continue reading Continue reading

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