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Research ArticleBRAIN

Radiation Exposure of Patients in Comprehensive Computed Tomography of the Head in Acute Stroke

M. Cohnen, H.-J. Wittsack, S. Assadi, K. Muskalla, A. Ringelstein, L.W. Poll, A. Saleh and U. Mödder
American Journal of Neuroradiology September 2006, 27 (8) 1741-1745;
M. Cohnen
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H.-J. Wittsack
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S. Assadi
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K. Muskalla
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A. Ringelstein
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L.W. Poll
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A. Saleh
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U. Mödder
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    Fig 1.

    Topogram of Alderson-Rando-phantom demonstrating scan areas for standard CT of the head (A), CTP (B), as well as intracranial CTA (C), and cervical CTA (D), respectively.

Tables

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    Table 1:

    Parameters of different scan protocols

    Standards CTCT AngiographyCT Perfusion
    BaseCerebrumIntracranialCervicalProtocol IProtocol IIProtocol III
    Collimation (mm)20 × 1.220 × 1.264 × 0.664 × 0.620 × 1.220 × 1.220 × 1.2
    Table feed (mm)242445,969,7000
    Pitch111.21.8000
    Tube current (mAseff)350300160115270200200
    Electrical mA350300383417270200200
    Potential (kV)1201201001208080120
    Rot. time (s)110.50.33111
    Scan length (mm)4895250280242424
    Scan time (s)6.254.58404040
    CTDIvol total (mGy)39.8634.1612.797.9432320970
    DLP total (mGy x cm)20334838627710377682330
    • Note:—Table feed indicates table movement per second. Pitch corresponds to the dose-relevant pitch (table feed per total collimation considering the number of detector rows acquired simultaneously). CTDI indicates computed tomography dose index; DLP, dose–length product.

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    Table 2:

    Organ doses and effective doses as measured by lithium fluoride thermoluminescent dosimeters in several positions for different scan protocols

    Standard CTCT AngiographyCT Perfusion
    IntracranialCervicalProtocol IProtocol IIProtocol III
    Organ doses (mGy)
        Cerebrum (overall)22.211.79.8117.982.5325.2
        Cerebrum (highest dose)35.29.210.3164.9114.1444.2
        Skin (total)11.73.10.726.920.2126.9
        Skin (highest dose)36.216.119.2112.387.2404.8
        Bone marrow (total)2.22.74.34.24.220.7
        Bone marrow (skull)15.89.91021.421.9118.1
        Eye lens5.415.21313.77.935.7
        Thyroid1.119.719.22.42.49.2
        Esophagus0.74.87.52.01.24.7
        Lung0.40.64.00.70.41.0
        Gonads0.20.30.20.20.20.2
    Effective dose (mSv)*1.71.92.81.2/1.31.1/1.25.0
    • * Data for effective doses are given for male and female subjects if different (male/female).

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American Journal of Neuroradiology: 27 (8)
American Journal of Neuroradiology
Vol. 27, Issue 8
September 2006
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Cite this article
M. Cohnen, H.-J. Wittsack, S. Assadi, K. Muskalla, A. Ringelstein, L.W. Poll, A. Saleh, U. Mödder
Radiation Exposure of Patients in Comprehensive Computed Tomography of the Head in Acute Stroke
American Journal of Neuroradiology Sep 2006, 27 (8) 1741-1745;

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Radiation Exposure of Patients in Comprehensive Computed Tomography of the Head in Acute Stroke
M. Cohnen, H.-J. Wittsack, S. Assadi, K. Muskalla, A. Ringelstein, L.W. Poll, A. Saleh, U. Mödder
American Journal of Neuroradiology Sep 2006, 27 (8) 1741-1745;
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