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Classification of Diseased Lungs Using a Combination of Riesz and Gabor Transforms and Machine Learning
Published in Ayman El-Baz, Jasjit S. Suri, Lung Imaging and CADx, 2019
Luca Saba, Joel C. M. Than, Norliza M. Noor, Omar M. Rijal, Rosminah M. Kassim, Ashari Yunus, Harman S. Suri, Michele Porcu, Jasjit S. Suri
High-resolution computed tomography (HRCT) is a noninvasive solution for clinicians to view lung diseases, such as interstitial lung disease (ILD) [3]. There are common lung tissue patterns in ILD, such as ground glass opacities, reticular pattern, pleural thickening, honeycombing, and parenchymal consolidation [4]. A typical CT scan of a patient, as shown in Figure 12.1, may yield 30 to 300 slices, depending on the slice thickness and slice interval. This leads to fatigue in work flow and a drop in diagnostic accuracy [5]. Thus, this creates a further challenge for the radiologist in terms of decision making and risk stratification.
Device profile of the Zephyr endobronchial valve in heterogenous emphysema: overview of its safety and efficacy
Published in Expert Review of Medical Devices, 2021
Steven R. Verga, Gerard J. Criner
Target lobe selection was based on 50% destruction score [which is based on percentage of voxels < −910 Hounsfield units (HU) on (high resolution computed tomography (HRCT)] along with heterogenous emphysema defined by difference of 15% ≥ destruction score between the targeted and INL (calculated by Myrian quantitative software) [3,15]. ‘Complete’ fissure integrity (based on high HRCT visual score of ≥ 90% fissure completeness) was essential based on post-hoc analysis of VENT trial to identify potential patients that would benefit from BLVR [9]. Fissure integrity was a marker of collateral ventilation (CV), which would result in incomplete bronchial occlusion of target lobe due to alternative pathways of ventilation via pores of Kohn, bronchioloalveolar communications of Lambert and intrabronchiolar pathways of Martin [22]. With only 1 fissure, the left targeted lobe more likely to have no collateral ventilation [14,15,21,23]. Lobar perfusion aided in targeted lobe selection, for upper lobes <8% of total perfusion compared to lower lobe targets with <13% total perfusion [24].