Article Figures & Data
Figures
- FIGURE 1.
Phantom with B-shielding. (A) CT dose index (CTDI) phantom with B-shielding placed over surface. (B) Pencil-shaped ionization chamber positioning.
- FIGURE 2.
Images with ROI settings for evaluation. ROIs are placed at top, middle, and bottom of image.
- FIGURE 3.
Mean of CT number determined on CT images as function of B-shielding at top (A), middle (B), and bottom (C) of image. Mean CT number generated with shielding is slightly higher at middle and bottom of image.
- FIGURE 4.
Comparison of attenuation coefficients with and without B-shielding at top (A), middle (B), and bottom (C) of image. Attenuation coefficients at middle and bottom of image are not significantly different with and without B-shielding.
- FIGURE 5.
Coefficient of variation as function of B-shielding at top (A), middle (B), and bottom (C) of image. Coefficient of variation = SD/mean.
- FIGURE 6.
Comparison of regional radioactivity with and without B-shielding. Amounts of regional radioactivity do not differ significantly. Difference was highest in thalamus (5.1%).
- FIGURE 7.
Examples of SPECT images acquired with B-shielding. (A) Reference image from 3D brain phantom. (B) Image acquired with B-shielding. Quality of both images is similar.
Tables
Tube current (mA) Parameter 30 40 50 100 150 200 Dose without shield (mGy) 0.36 0.42 0.48 0.96 1.45 1.93 Dose with shield (mGy) 0.14 0.17 0.19 0.38 0.58 0.77 Reduction (%) 61.1 59.5 60.4 60.4 60.0 60.1
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