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A digital magnetic resonance imaging spectrometer using digital signal processor and field programmable gate array
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10.1063/1.4803007
/content/aip/journal/rsi/84/5/10.1063/1.4803007
http://aip.metastore.ingenta.com/content/aip/journal/rsi/84/5/10.1063/1.4803007
View: Figures

Figures

Image of FIG. 1.
FIG. 1.

Block diagram of the spectrometer.

Image of FIG. 2.
FIG. 2.

(a) Photograph of the spectrometer except for the gain-amplifier. Circuit boards plugged into the backboard are: the network interface card, the data acquisition module, the pulse programmer, the rf generation module, the gradient control module, and the gradient output module, from left to right. (b), (c), (d), and (e) list photographs of circuit boards of the pulse programmer, the gradient control module, the rf generation module, and the data acquisition module, respectively.

Image of FIG. 3.
FIG. 3.

Block diagram of the FPGA of the gradient control module.

Image of FIG. 4.
FIG. 4.

Block diagram of gradient generation.

Image of FIG. 5.
FIG. 5.

Block diagram of the rf generation module.

Image of FIG. 6.
FIG. 6.

Block diagram of one of the two receiving channels.

Image of FIG. 7.
FIG. 7.

Function diagram of creation and execution of a pulse sequence.

Image of FIG. 8.
FIG. 8.

(a) T1-weighted image of channel 1. (b) T1-weighted image of channel 2. (c) Synthesis image of channel 1 and 2 using sum-of-square algorithm. Main experiment parameters are as follows: spectrometer frequency (SF) = 21.63 MHz, 90° pulse width (P90) = 2.6 ms, 180° pulse width (P180) = 2.6 ms, TR = 500 ms, TE = 20 ms, number of excitations (NEX) = 2, acquisition matrix size is 256 × 256, field of view (FOV) = 240 × 240 mm, slice thickness = 8 mm, and receiving bandwidth (SW) = 25 kHz. Image SNR of channel 1 and channel 2 is 98.6 and 67.5, respectively, and SNR of synthesis image is 113.7. The total acquisition time of these images is TR × NEX × 256 = 500 × 2 × 256 ms = 256 s.

Image of FIG. 9.
FIG. 9.

Four adjacent slices of axial images of a human brain using T1-weighted SE sequence. Main experiment parameters are as follows: SF = 21.63 MHz, P90 = 2.6 ms, P180 = 2.6 ms, TR = 500 ms, TE = 20 ms, NEX = 2, acquisition matrix size is 256 × 256, FOV = 240 × 240 mm, slice thickness = 8 mm, slice gap = 1 mm, and SW = 25 kHz. The total acquisition time of these images is 256 s.

Image of FIG. 10.
FIG. 10.

Four adjacent slices of axial images of a pineapple using T1-weighted SE sequence. Main experiment parameters are as follows: SF = 21.63 MHz, P90 = 2.6 ms, P180 = 2.6 ms, TR = 500 ms, TE = 18 ms, NEX = 2, acquisition matrix size is 256 × 256, FOV = 240 × 240 mm, slice thickness = 5 mm, slice gap = 5 mm, and SW = 25 kHz. The total acquisition time of these images is 256 s.

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/content/aip/journal/rsi/84/5/10.1063/1.4803007
2013-05-02
2014-04-21
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: A digital magnetic resonance imaging spectrometer using digital signal processor and field programmable gate array
http://aip.metastore.ingenta.com/content/aip/journal/rsi/84/5/10.1063/1.4803007
10.1063/1.4803007
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