Volume 41, Pages (January 2017)

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Volume 41, Pages 157-163 (January 2017) Parenchymal density changes in acute pulmonary embolism: Can quantitative CT be a diagnostic tool? A preliminary study Ikram Eda Duman, Canan Cimsit, Sehnaz Olgun Yildizeli, Nuri Cagatay Cimsit Clinical Imaging Volume 41, Pages 157-163 (January 2017) DOI: 10.1016/j.clinimag.2016.11.005 Copyright © 2016 Elsevier Inc. Terms and Conditions

Fig. 1 Patient without PE. PDV of each zone is between −750HU and −800HU. Relative intensity histograms are nearly identical. Example of subrange density distribution in the axial plane shows color coded mapping. Clinical Imaging 2017 41, 157-163DOI: (10.1016/j.clinimag.2016.11.005) Copyright © 2016 Elsevier Inc. Terms and Conditions

Fig. 2 Patient with bilateral lobar and segmental PE. PDVs are lower than PE negative cases on both sides and all values are below ROC thresholds of corresponding zones. Relative intensity histograms shifted to the left compared to PE negative example. Clinical Imaging 2017 41, 157-163DOI: (10.1016/j.clinimag.2016.11.005) Copyright © 2016 Elsevier Inc. Terms and Conditions

Fig. 3 Patient with unilateral left segmental PE. PDV of LLZ is lower than the normal range and below ROC threshold. Relative intensity histogram demonstrates the clear shift to the left of LLZ. Color coded mapping of subrange density distribution in the axial plane shows marked difference between LLZ and RLZ. Clinical Imaging 2017 41, 157-163DOI: (10.1016/j.clinimag.2016.11.005) Copyright © 2016 Elsevier Inc. Terms and Conditions

Fig. 4 ROC curve analysis of six zones to detect possible cut-off threshold value for density based PE. AUC ranges between 0.729 and 0.842. Clinical Imaging 2017 41, 157-163DOI: (10.1016/j.clinimag.2016.11.005) Copyright © 2016 Elsevier Inc. Terms and Conditions