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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
Congress: ECR 2019
Poster No.: C-3543
Type: Scientific Exhibit
Keywords: Thorax, Lung, CT, Image manipulation / Reconstruction, Computer Applications-General, Radiation safety, Artifacts, Dosimetric comparison
Authors: S. Carey1, S. Kandel1, J. Kavanagh2, T. Chung1, C. Farrell1, P. Rogalla1; 1Toronto, ON/CA, 2Toronto/CA
DOI:10.26044/ecr2019/C-3543

Results

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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