|ECR 2019 / C-3543|
|Ultra-low dose CT of the chest at 0.18 mSv: comparison of a novel projection technique with conventional chest x-ray|
The area under the ROC curve was measured for each assessment category (Fig 4). The average area under the curve for each category increased by .276, or ~45%.
The mean time for interpretation and image quality score for X-rays/thoracic tomograms was 24.0s/36.9s (p=0.07), and 7.8/8.2 (p=0.16), respectively. To have a rough comparison of the noise in the three discussed projection techniques, a histogram was taken for a 70x70 region in the liver of an image which was processed with average projection, MIP, and thoracic tomogram projection (Fig 5). The standard deviation of this region for each image is measured to be: MIP: 4.581 HU, AVG: 2.520 HU, Thoracic Tomogram: 2.517 HU.
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