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Simultaneous 3-Dimensional Resolution Correction in SPECT Reconstruction with an Ordered-Subsets Expectation Maximization Algorithm

Yasuyuki Takahashi, Kenya Murase, Teruhito Mochizuki, Yoshifumi Sugawara, Hisato Maeda and Akiyoshi Kinda
Journal of Nuclear Medicine Technology March 2007, 35 (1) 34-38;
Yasuyuki Takahashi
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Kenya Murase
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Teruhito Mochizuki
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Yoshifumi Sugawara
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Hisato Maeda
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Akiyoshi Kinda
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Figures

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  • FIGURE 1. 
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    FIGURE 1. 

    Reconstruction image for ball simulation with balls of various sizes.

  • FIGURE 2. 
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    FIGURE 2. 

    Reconstruction image for line-source phantom in which radial distances were changed. DRC (−) = before DRC; DRC (+) = after DRC.

  • FIGURE 3. 
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    FIGURE 3. 

    Emission CT images before DRC (−) and after DRC (+). Hot-rod phantom, myocardial phantom, and human study are shown from top to bottom. Schemes are shown at left.

  • FIGURE 4. 
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    FIGURE 4. 

    Circumferential profile analysis at dotted line in each scheme. (A) Hot-rod phantom study. (B) Myocardial phantom study (transverse). (C) Myocardial phantom study (short axis). (D) Human study.

Tables

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    TABLE 1

    Measurements of FWHM Before and After DRC in Ball Simulation

    FWHM (cm)
    BallTrue FWHM (cm)AxisBefore DRCAfter DRC
    A5.58x5.905.10
    y5.795.01
    z6.115.26
    B3.72x4.153.54
    y4.013.43
    z4.243.61
    C1.86x2.251.88
    y2.091.75
    z2.351.97
    D0.93x1.261.02
    y1.110.89
    z1.371.11
    E2.79x3.222.71
    y3.072.59
    z3.382.84
    F4.65x5.114.34
    y4.894.24
    z5.184.48
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    TABLE 2

    Measurements of FWHM Before and After DRC in Phantom Study

    Centimeters
    145185225265305
    DRC (−)Central0.86 ± 0.040.91 ± 0.051.06 ± 0.071.24 ± 0.071.30 ± 0.08
    Radial1.02 ± 0.031.14 ± 0.051.23 ± 0.071.35 ± 0.101.50 ± 0.12
    Tangential1.03 ± 0.031.16 ± 0.051.21 ± 0.071.27 ± 0.121.54 ± 0.18
    DRC (+)Central0.44 ± 0.010.54 ± 0.010.75 ± 0.020.80 ± 0.020.99 ± 0.02
    Radial0.54 ± 0.010.65 ± 0.020.82 ± 0.030.95 ± 0.021.16 ± 0.03
    Tangential0.55 ± 0.010.66 ± 0.020.81 ± 0.031.06 ± 0.061.11 ± 0.06
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Journal of Nuclear Medicine Technology: 35 (1)
Journal of Nuclear Medicine Technology
Vol. 35, Issue 1
March 2007
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Simultaneous 3-Dimensional Resolution Correction in SPECT Reconstruction with an Ordered-Subsets Expectation Maximization Algorithm
Yasuyuki Takahashi, Kenya Murase, Teruhito Mochizuki, Yoshifumi Sugawara, Hisato Maeda, Akiyoshi Kinda
Journal of Nuclear Medicine Technology Mar 2007, 35 (1) 34-38;

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Simultaneous 3-Dimensional Resolution Correction in SPECT Reconstruction with an Ordered-Subsets Expectation Maximization Algorithm
Yasuyuki Takahashi, Kenya Murase, Teruhito Mochizuki, Yoshifumi Sugawara, Hisato Maeda, Akiyoshi Kinda
Journal of Nuclear Medicine Technology Mar 2007, 35 (1) 34-38;
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