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Multiplexing radiography using a carbon nanotube based x-ray source
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10.1063/1.2234744
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    Affiliations:
    1 Department of Radiation Oncology, University of North Carolina, Chapel Hill, North Carolina 27599
    2 Department of Physics and Astronomy, University of North Carolina, Chapel Hill, North Carolina 27599
    3 School of Medicine, University of North Carolina, Chapel Hill, North Carolina 27599
    4 Department of Radiation Oncology, University of North Carolina, Chapel Hill, North Carolina 27599
    5 Department of Physics and Astronomy, University of North Carolina, Chapel Hill, North Carolina 27599 and Curriculum in Applied and Materials Sciences, University of North Carolina, Chapel Hill, North Carolina 27599
    a) Electronic mail: zhou@physics.unc.edu
    Appl. Phys. Lett. 89, 064106 (2006); http://dx.doi.org/10.1063/1.2234744
/content/aip/journal/apl/89/6/10.1063/1.2234744
http://aip.metastore.ingenta.com/content/aip/journal/apl/89/6/10.1063/1.2234744
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Figures

Image of FIG. 1.
FIG. 1.

(a) Schematics of the conventional CT scanner (left) and the multiplexing imaging system using a nine-pixel x-ray source and a digital area detector (right). (b) Each individual x-ray pixel of the multipixel x-ray source is comprised of a CNT based field emission cathode, a thick dielectric spacer, an extraction gate, and a focusing electrode. The cathode was a thin CNT composite film deposited on a metal substrate by electrophoresis.

Image of FIG. 2.
FIG. 2.

The flow chart for the OFDM imaging process. (a) Two incident x-ray beams with the respective pulsing frequencies of and transmitted through the phantom and formed a multiplexed x-ray signal including both frequency components. (b) The multiplexed images were recorded by a single flat panel x-ray detector which collected the transmitted x-ray intensity as a function of time over a certain period . (c) DFT algorithm was used to demultiplex the composite x-ray signals recorded by a detector pixel. The orthogonal nature of the signals was a result of the peak of each subcarrier corresponding to the nulls of other subcarriers. (d) The demultiplexed images were achieved by repeating the demultiplexing procedure for all the detector pixels.

Image of FIG. 3.
FIG. 3.

(a) A schematic showing the wave forms used for the nine x-ray beams in this experiment. The pulsing frequencies ranged from with frequency separation. (b) In frequency domain, the simulation demonstrated that, at the central frequency of each subcarrier, there was no cross-talk from the other subcarriers due to the orthogonality of the signals. (c) The transmitted x-ray intensity vs time data recorded on one detector pixel. (d) One frame of a typical multiplexed x-ray image of the computer board.

Image of FIG. 4.
FIG. 4.

(a) The DFT based algorithm was applied to demultiplex the multiplexing x-ray signal showed in Fig. 3(d). (b) Nine demultiplexed images corresponding to nine frequency channels were obtained by the OFDM scheme showing the circuit board from different viewing angles. (c) One of the demultiplexed images of the circuit board from the x-ray pixel . (d) A projection image taken using only the x-ray pixel with the same dose and geometry as in (c). The difference between the two images is visually negligible.

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/content/aip/journal/apl/89/6/10.1063/1.2234744
2006-08-09
2014-04-19
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Multiplexing radiography using a carbon nanotube based x-ray source
http://aip.metastore.ingenta.com/content/aip/journal/apl/89/6/10.1063/1.2234744
10.1063/1.2234744
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