Research ArticleIMAGING

Ambient Temperature and Cardiac Accumulation of 18F-FDG

Samantha O’Loughlin, Geoffrey M. Currie, Marko Trifonovic and Hosen Kiat
Journal of Nuclear Medicine Technology September 2014, 42 (3) 188-193; DOI: https://doi.org/10.2967/jnmt.114.143867

Article Figures & Data

Figures

  • FIGURE 1.
    FIGURE 1.

    PET scans in same patient under different ambient temperatures showing reduction of BAT in warm temperatures (right) and intense cardiac 18F-FDG uptake in cooler conditions (left) (6).

  • FIGURE 2.
    FIGURE 2.

    Average heart counts per pixel vs. season (P = 0.031). Diamonds represent 95% CI of each mean (center line of diamond), and horizontal line represents overall mean.

  • FIGURE 3.
    FIGURE 3.

    Maximum heart counts per pixel vs. season (P = 0.024). Diamonds represent 95% CI of each mean (center line of diamond), and horizontal line represents overall mean.

  • FIGURE 4.
    FIGURE 4.

    Average heart counts per pixel (left) and maximum heart counts per pixel (right) plotted against minimum daily temperature showing decreasing counts per pixel with increasing daily minimum temperatures (P = 0.0476, R2 = 0.09, and P = 0.0475, R2 = 0.09, respectively).

  • FIGURE 5.
    FIGURE 5.

    Average heart counts per pixel (left) and maximum heart counts per pixel (right) plotted against 3-d mean temperature showing decreasing counts per pixel with increasing 3-d mean temperatures (P = 0.0437, R2 = 0.09, and P = 0.0408, R2 = 0.09, respectively).

  • FIGURE 6.
    FIGURE 6.

    Cardiac SUV vs. season (P = 0.026). Diamonds represent 95% CI of each mean (center line of diamond), and horizontal line represents overall mean.

  • FIGURE 7.
    FIGURE 7.

    Cardiac SUV plotted against minimum daily temperature (left) and 3-d mean temperature (right) showing decreasing cardiac SUV with increasing temperatures (P = 0.0244, R2 = 0.10, and P = 0.0320, R2 = 0.10, respectively).

Tables

  • TABLE 1

    Summary of Key Variables in Summer and Winter

    VariableSummerWinterP
    Dose (mean)274.6 MBq269.0 MBq0.533
    Age (mean)68.3 y67.2 y0.738
    Sex38.9% female44.4% female0.712
    Average liver counts per pixel (mean)2.923.170.495
    Maximum liver counts per pixel (mean)5.375.350.979
    Average heart counts per pixel (mean)3.004.110.031
    Maximum heart counts per pixel (mean)5.367.330.024
  • TABLE 2

    Meteorologic Data for Summer and Winter

    TemperatureSummerWinterP
    Mean daily maximum27.9°C17.5°C<0.001
    Mean daily minimum21.0°C9.8°C<0.001
    Daily average24.4°C13.7°C<0.001
    3-d mean24.6°C14.1°C<0.001
    1-wk mean24.9°C14.0°C<0.001
    2-wk mean24.6°C13.8°C<0.001
    3-wk mean24.4°C13.8°C<0.001
    4-wk mean24.2°C13.9°C<0.001
  • TABLE 3

    Summary of Relationship Between Cardiac 18F-FDG Uptake SUV and Various Ambient Temperatures

    TemperatureAverage heart counts per pixelMaximum heart counts per pixelCardiac SUV
    Daily minimumP = 0.0476, R2 = 0.09P = 0.0437, R2 = 0.09P = 0.0244, R2 = 0.10
    Daily maximumP = 0.1674P = 0.1446P = 0.1116
    Daily meanP = 0.0820P = 0.0721P = 0.0455, R2 = 0.08
    3-d meanP = 0.0475, R2 = 0.09P = 0.0408, R2 = 0.09P = 0.0320, R2 = 0.10
    1-wk meanP = 0.0765P = 0.0687P = 0.0593
    2-wk meanP > 0.08P = 0.0781P > 0.08
    3-wk meanP > 0.08P = 0.0817P > 0.08
    4-wk meanP > 0.08P = 0.0830P > 0.08
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