METHOD FOR MAGNETIC RESONANCE TOMOGRAPHIC DIAGNOSIS OF TRACHEOMALACIA Russian patent published in 2016 - IPC A61B5/55 A61M15/00 

FIELD: medicine.

SUBSTANCE: invention relates to medicine, X-ray diagnostics, otorhinolaryngology, thoracic surgery and pulmonology. Tracheomalacia is carried out using MRT with short fast sequences Trufi or HASTE to obtain T2-VX, in axial projection. Inhalation is 5-8 ml aqueous aerosol size 3-5 mcm. Scanning is performed by forced breathing, separately for phase of inhalation and exhalation phase, at three levels cicatrical stenosis of trachea, above and below tracheal stenosis at distance equal to size of vertebral body. After obtaining images are degree collapse tracheal cross-section at level of cicatrical stenosis by formula: Percentage collapse tracheal lumen = ((A-B)/A)×100 %, where A is cross-sectional area of trachea after inhalation (mm²); B - area of cross section of trachea out (mm²). Estimating tracheal wall thickness and uniformity of magnetic resonance signal. Tracheomalacia is diagnosed in determining a set of following signs: collapse of tracheal lumen in zone of percentage stenosis is more than 50 %, tracheal wall thickness is reduced to 1.5-5 mm in area of cicatricial strictures and to 1.5-2.5 mm outside zone of stenosis in cartilage along front semicircle, there is a discontinuity MR-signal with sections of hypo-and weakly hyperintensive signal, at least within tracheal stenosis.

EFFECT: method provides early detection of tracheomalacia, diagnostic accuracy in determining true tracheal wall thickness, structure of pathologically changed wall of trachea and paratracheal subcutaneous fat, prevalence of pathological process, visualisation of trachea in each phase forced breathing.

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