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Improved Turnaround Times | Median time to first decision: 12 days

Research ArticlePatient Safety

Effect of Tube Voltage on Image Quality in 64-Section Multidetector 3D CT Angiography: Evaluation with a Vascular Phantom with Superimposed Bone Skull Structures

Y. Murakami, S. Kakeda, K. Kamada, N. Ohnari, J. Nishimura, M. Ogawa, K. Otsubo, Y. Morishita and Y. Korogi
American Journal of Neuroradiology April 2010, 31 (4) 620-625; DOI: https://doi.org/10.3174/ajnr.A1871
Y. Murakami
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S. Kakeda
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K. Kamada
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N. Ohnari
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J. Nishimura
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M. Ogawa
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K. Otsubo
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Y. Morishita
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Y. Korogi
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    Fig 1.

    Photograph (A) and schematic drawing (B) of the anthropomorphic vascular phantom used in this study.

  • Fig 2.
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    Fig 2.

    Graphs show the mean SNRs obtained at contrast material concentrations of 15 (A) and 20 mg I/mL (B). Asterisks show statistically significant differences at identical CTDIWs compared with the values of the standard CT image at 100 kV(p). At identical dose levels, the mean SNRs at 100 kV(p) from contrast material concentrations of 15 and 20 mg I/mL are significantly higher than those at 80, 120, and 135 kV(p) (P < .05).

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    Fig 3.

    Graphs show the mean CNRs obtained at contrast material concentrations of 15 (A) and 20 mg I/mL (B). Asterisks show statistically significant differences at identical CTDIWs, compared with the values of the standard CT image at 100 kV(p). At identical dose levels, the mean CNRs at 100 kV(p) from contrast material concentrations of 15 and 20 mg I/mL are significantly higher than those at 80, 120, and 135 kV(p) (P < .05).

  • Fig 4.
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    Fig 4.

    CT angiograms at a concentration of 20 mg I/mL and at identical dose levels (CTDIw of 38 mGy). A, Tube voltage is 80 kV(p). B, 100 kV(p). C, 120 kV(p). D, 135 kV(p). For the mean qualitative image score with regard to the depiction of the simulated intracranial aneurysms (arrows) and aneurysmal blebs (arrowheads) on CT angiograms, 100 kV(p) is significantly superior to 80 and 135 kV(p) and is slightly superior to 120 kV(p).

Tables

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    Table 1:

    Scanning parameters for CT angiography

    kV(p)mACTDIw (mGy)
    8036033
    42038
    47043
    10021033
    24038
    27043
    30048
    33053
    12014033
    16038
    18043
    20048
    22053
    13511033
    12038
    13043
    14048
    15053
    • View popup
    Table 2:

    Mean objective measurements of background noisea

    CTDIw (mGy)15 mg I/mL20 mg I/mL
    80 kV(p)100 kV(p)120 kV(p)135 kVp80 kV(p)100 kV(p)120 kV(p)135 kV(p)
    3334.8 ± 0.1824.2 ± 0.2421.1 ± 0.1820.0 ± 0.2035.3 ± 0.1424.9 ± 0.0321.7 ± 0.0820.0 ± 0.16
    3831.4 ± 0.2622.3 ± 0.3419.4 ± 0.2719.3 ± 0.1232.9 ± 0.2823.0 ± 0.0719.8 ± 0.1419.2 ± 0.02
    4329.3 ± 0.1321.5 ± 0.1418.6 ± 0.0818.0 ± 0.1529.7 ± 0.2821.6 ± 0.2818.6 ± 0.0717.7 ± 0.02
    4820.2 ± 0.1617.7 ± 0.1916.9 ± 0.1620.5 ± 0.2817.9 ± 0.0116.6 ± 0.02
    5319.4 ± 0.1116.6 ± 0.2116.3 ± 0.1319.4 ± 0.1316.5 ± 0.1615.9 ± 0.02
    • a Data are the mean ± SD.

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    Table 3:

    Mean qualitative image scores for the depiction of simulated aneurysms and blebsa

    CTDIw (mGy)15 mg I/mL20 mg I/mL
    80 kV(p)100 kV(p)120 kV(p)135 kV(p)80 kV(p)100 kV(p)120 kV(p)135 kV(p)
    331.86 ± 0.54b2.86 ± 0.662.29 ± 0.72b1.79 ± 0.58b3.07 ± 0.62b3.57 ± 0.653.36 ± 0.632.71 ± 0.47b
    382.07 ± 0.73b3.07 ± 0.622.57 ± 0.85b2.21 ± 0.80b3.29 ± 0.61b3.79 ± 0.583.57 ± 0.512.92 ± 0.61b
    432.57 ± 0.65b3.14 ± 0.662.85 ± 0.77b2.28 ± 0.82b3.50 ± 0.65b3.92 ± 0.483.85 ± 0.663.07 ± 0.62b
    483.36 ± 0.633.29 ± 0.612.71 ± 0.91b4.07 ± 0.484.00 ± 0.553.29 ± 0.61b
    533.71 ± 0.613.57 ± 0.512.86 ± 0.77b4.43 ± 0.654.21 ± 0.703.57 ± 0.51b
    • a Data are the mean ± SD.

    • b Statistically significant difference at identical CTDIws, compared with the value of the standard CT image at 100 kV(p).

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    Table 4:

    Mean width of the 3-mm aneurysm measured with 3D renderings of CT angiographya

    CTDIw (mGy)15 mg I/mL20 mg I/mL
    80 kV(p)100 kV(p)120 kV(p)135 kV(p)80 kV(p)100 kV(p)120 kV(p)135 kV(p)
    332.45 ± 0.162.70 ± 0.112.63 ± 0.142.65 ± 0.172.63 ± 0.142.73 ± 0.172.73 ± 0.162.65 ± 0.18
    382.68 ± 0.132.81 ± 0.162.70 ± 0.182.64 ± 0.212.69 ± 0.212.89 ± 0.292.70 ± 0.142.69 ± 0.20
    432.75 ± 0.212.80 ± 0.082.85 ± 0.132.70 ± 0.222.85 ± 0.182.93 ± 0.142.88 ± 0.172.73 ± 0.17
    482.88 ± 0.102.90 ± 0.132.73 ± 0.172.96 ± 0.062.95 ± 0.092.89 ± 0.26
    532.88 ± 0.122.89 ± 0.102.76 ± 0.202.96 ± 0.042.93 ± 0.162.86 ± 0.19
    • a Data are the mean ± SD.

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American Journal of Neuroradiology: 31 (4)
American Journal of Neuroradiology
Vol. 31, Issue 4
1 Apr 2010
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Effect of Tube Voltage on Image Quality in 64-Section Multidetector 3D CT Angiography: Evaluation with a Vascular Phantom with Superimposed Bone Skull Structures
Y. Murakami, S. Kakeda, K. Kamada, N. Ohnari, J. Nishimura, M. Ogawa, K. Otsubo, Y. Morishita, Y. Korogi
American Journal of Neuroradiology Apr 2010, 31 (4) 620-625; DOI: 10.3174/ajnr.A1871
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Y. Murakami, S. Kakeda, K. Kamada, N. Ohnari, J. Nishimura, M. Ogawa, K. Otsubo, Y. Morishita, Y. Korogi
Effect of Tube Voltage on Image Quality in 64-Section Multidetector 3D CT Angiography: Evaluation with a Vascular Phantom with Superimposed Bone Skull Structures
American Journal of Neuroradiology Apr 2010, 31 (4) 620-625; DOI: 10.3174/ajnr.A1871

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