Comput Math Methods Med - Semiautomatic segmentation of ventilated airspaces in healthy and asthmatic subjects using hyperpolarized 3He MRI.

Tópicos

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Resumo

A segmentation algorithm to isolate areas of ventilation from hyperpolarized helium-3 magnetic resonance imaging (HP (3)He MRI) is described. The algorithm was tested with HP (3)He MRI data from four healthy and six asthmatic subjects. Ventilated lung volume (VLV) measured using our semiautomated technique was compared to that obtained from manual outlining of ventilated lung regions and to standard spirometric measurements. VLVs from both approaches were highly correlated (R = 0.99; P < 0.0001) with a mean difference of 3.8mL and 95% agreement indices of -30.8mL and 38.4mL. There was no significant difference between the VLVs obtained through the semiautomatic approach and the manual approach. A Dice coefficient which quantified the intersection of the two datasets was calculated and ranged from 0.95 to 0.97 with a mean of 0.96 ? 0.01 (mean ? SD). VLVs obtained through the semiautomatic algorithm were also highly correlated with measurements of forced expiratory volume in one second (FEV1) (R = 0.82; P = 0.0035) and forced vital capacity (FVC) (R = 0.95; P < 0.0001). The technique may open new pathways toward advancing more quantitative characterization of ventilation for routine clinical assessment for asthma severity as well as a number of other respiratory diseases.

Resumo Limpo

segment algorithm isol area ventil hyperpolar helium magnet reson imag hp mri describ algorithm test hp mri data four healthi six asthmat subject ventil lung volum vlv measur use semiautom techniqu compar obtain manual outlin ventil lung region standard spirometr measur vlvs approach high correl r p mean differ ml agreement indic ml ml signific differ vlvs obtain semiautomat approach manual approach dice coeffici quantifi intersect two dataset calcul rang mean mean sd vlvs obtain semiautomat algorithm also high correl measur forc expiratori volum one second fev r p forc vital capac fvc r p techniqu may open new pathway toward advanc quantit character ventil routin clinic assess asthma sever well number respiratori diseas

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