METHOD OF ANATOMICAL SUBLOBULAR PULMONARY RESECTIONS SCHEDULING IN PATIENTS WITH PERIPHERAL VOLUMETRIC FORMATIONS BASED ON CT-PULMONARY ANGIOGRAPHY Russian patent published in 2016 - IPC A61B6/03 G06T15/00 

FIELD: medicine.

SUBSTANCE: invention refers to medicine, radiology and can be used within personalization in planning of surgical reception in patients with lungs peripheral space-occupying masses (SOM). Method of 3D reconstruction of bronchi vascular structures in patients with SOM based on CT-pulmonary angiography involves conducting of CT in two-phase spiral scanning mode. Bolus-tracking scan is installed on level corresponding to aortic arch lower contour. Selecting fragment of axial tomogram (ROI), where density will be tracked in real time mode, in upper vena cava lumen area, at its maximum diameter level, with preservation of automatic scanning start during first phase when obtaining of x-ray radiation (KO) attenuation factor values inside ROI of +140HU. With SOM localisation in lung upper sections scanning is performed in craniocaudal direction, with localisation in lower sections is in caudocranial. At that, maximum difference ranges of pulmonary arteries (LA) and veins (LB) KO gaps is obtained. Second scanning phase is started through 10 s after completion of first, scanning direction is reverse to previous phase. Data obtained for each phase in form of first and second post-contrast series of axial tomograms are reconstructed with reconstruction thickness of 1 mm and increment of 0.8 using hybrid reconstruction filter. Then, anatomical data synchronization of both post-contrast series is performed, in of first series window threshold value mask is created, including LA, LB, bronchial tubes and SOM, using upper and lower KO range thresholds corresponding to contrasted blood in LA gaps, followed by 3D filling of region corresponding to LA. Then mask creating procedure is repeated for second series of tomograms using upper and lower KO range thresholds, corresponding to contrasted blood in LB gaps, with filling of region corresponding to LB. Further, corresponding to LA area is transferred into second series window and perform bronchial tree and SOM three-dimensional filling. In completion of post-processing treatment taking into account segmentary structure LA, LB branches, bronchial tree, SOM are assigned with colors with presentation of obtained results in form of three-dimensional model.

EFFECT: method ensures production of diagnostic images with large difference intervals of x-ray radiation weakening from LA and LB gaps and high-quality 3D reconstructions with LA, LB, bronchi and SOM colour mapping, obtaining data from entire region of interest regardless of distance between objects and without preliminary test bolus, that speeds up procedure.

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