Research ArticleClinical Investigations

Methods of CT Dose Estimation in Whole-Body 18F-FDG PET/CT

Yusuke Inoue, Kazunori Nagahara, Yoshihito Tanaka, Hiroki Miyatake, Hirofumi Hata and Toshimasa Hara
Journal of Nuclear Medicine May 2015, 56 (5) 695-700; DOI: https://doi.org/10.2967/jnumed.114.153718

Article Figures & Data

Figures

  • FIGURE 1.
    FIGURE 1.

    Division of scan range into 6 anatomic regions (head, neck, chest, abdomen, pelvis, and proximal thigh) is shown on display of CT-Expo software for male subject.

  • FIGURE 2.
    FIGURE 2.

    Regional ED values in group A estimated by CT-Expo method (white bars), regional DLP method (black bars), and simple DLP method (shaded bars). Means and SDs in men (A), women (B), and all patients (C) are presented.

  • FIGURE 3.
    FIGURE 3.

    Relationships of EDs estimated by different methods in group A. Estimates of regional DLP method (A) and simple DLP method (B) are plotted against those of CT-Expo method. Line of identity is also shown. ○ = data for men; △ = data for women.

  • FIGURE 4.
    FIGURE 4.

    Relationships of ED/DLP with body height (A) and body weight (B). Linear regression lines, regression equations, and Spearman correlation coefficients are shown. ○ = data for men; △ = data for women.

Tables

  • TABLE 1

    Patient Characteristics

    Group AGroup B
    CharacteristicMaleFemaleAllMaleFemaleAll
    Age (y)65.2 ± 13.161.9 ± 15.963.6 ± 14.568.5 ± 9.064.5 ± 11.966.5 ± 10.6
    Body height (cm)166.8 ± 6.1154.1 ± 6.8160.4 ± 9.1164.4 ± 4.9152.9 ± 7.3158.7 ± 8.4
    Body weight (kg)64.6 ± 12.849.1 ± 8.856.8 ± 13.465.8 ± 15.855.6 ± 18.360.7 ± 17.7

    • Values are mean ± SD.

  • TABLE 2

    Whole-Body ED Values in Group A

    ED (mSv)
    MethodMaleFemaleAll
    CT-Expo4.49 ± 0.814.40 ± 0.724.44 ± 0.76
    Regional DLP5.01 ± 1.043.98 ± 0.814.49 ± 1.06
    Simple DLP5.78 ± 1.124.69 ± 0.875.23 ± 1.14

    • Data are mean ± SD.

  • TABLE 3

    ED/DLP (mSv/mGy/cm)

    SubjectMaleFemaleAll
    Group A0.0117 ± 0.00050.0142 ± 0.00100.0129 ± 0.0015
    Group A + B0.0117 ± 0.00050.0141 ± 0.00090.0129 ± 0.0015

    • Data are mean ± SD. Group A + B represents subjects pooled from groups A and B.

  • TABLE 4

    Whole-Body ED Values in Group B

    ED (mSv)
    MethodConversion factorMaleFemaleAll
    CT-Expo4.69 ± 1.105.01 ± 1.474.85 ± 1.29
    Simple DLPOriginal5.93 ± 1.395.26 ± 1.685.60 ± 1.56
    Simple DLPModified5.14 ± 1.214.56 ± 1.464.85 ± 1.35
    Simple DLPSex-specific4.74 ± 1.114.91 ± 1.574.83 ± 1.35

    • Data are mean ± SD.

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