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At US, the diaphragm appears as a thick echogenic line. M-mode US may be used to measure the direction of diaphragmatic motion and the amplitude of excursion ( 36 – 38) ( Fig 23 ). Diaphragmatic paralysis in a 9-month-old infant with complex congenital heart disease who underwent a Rastelli procedure.
Quantitative evaluation with MR imaging may allow assessment of the excursion, synchronicity, and velocity of diaphragmatic motion. This modality also has the advantage of no ionizing radiation, but use of MR imaging for functional imaging of the diaphragm is largely limited by high costs.
Diagram Diab Symp Image
