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Table 1 Statistics of contrast enhancement

From: Visualization of internal 3D structure of small live seed on germination by laboratory-based X-ray microscopy with phase contrast computed tomography

 SNRResolution (μm)
Low resolution (n = 15)
 Original absorption3.44 ± 0.241.63 ± 0.14
 Denoise absorption8.78 ± 1.341.86 ± 0.11
 Phase retrieved13.15 ± 1.522.25 ± 0.15
High resolution (n = 5)
 Original absorption1.39 ± 0.100.93 ± 0.17
 Denoise absorption4.27 ± 0.581.03 ± 0.18
 Phase retrieved18.04 ± 1.391.62 ± 0.12
  1. A projection data set collected at low or high resolution was treated by three different methods before the CT reconstruction, and the three corresponding CT slices were analyzed. The SNR value was calculated as an average ± 95% CI from indicated numbers of comparisons between background and compound areas of 10 pixels × 10 pixels each for the low-resolution images and of 16 pixels × 16 pixels each for the high-resolution images, according to the definition described in “Methods” section. The resolution value was calculated as an average ± 95% CI from indicated numbers of line profiles of 25 μm for the low-resolution images and of 10–15 μm for the high-resolution images, according to the procedure described in “Methods” section