Comput Math Methods Med - Transfer function analysis of respiratory and cardiac pulsations in human brain observed on dynamic magnetic resonance images.

Tópicos

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Resumo

Magnetic resonance (MR) imaging provides a noninvasive, in vivo imaging technique for studying respiratory and cardiac pulsations in human brains, because these pulsations can be recorded as flow-related enhancement on dynamic MR images. By applying independent component analysis to dynamic MR images, respiratory and cardiac pulsations were observed. Using the signal-time curves of these pulsations as reference functions, the magnitude and phase of the transfer function were calculated on a pixel-by-pixel basis. The calculated magnitude and phase represented the amplitude change and temporal delay at each pixel as compared with the reference functions. In the transfer function analysis, near constant phases were found at the respiratory and cardiac frequency bands, indicating the existence of phase delay relative to the reference functions. In analyzing the dynamic MR images using the transfer function analysis, we found the following: (1) a good delineation of temporal delay of these pulsations can be achieved; (2) respiratory pulsation exists in the ventricular and cortical cerebrospinal fluid; (3) cardiac pulsation exists in the ventricular cerebrospinal fluid and intracranial vessels; and (4) a 180-degree phase delay or inverted amplitude is observed on phase images.

Resumo Limpo

magnet reson mr imag provid noninvas vivo imag techniqu studi respiratori cardiac pulsat human brain pulsat can record flowrel enhanc dynam mr imag appli independ compon analysi dynam mr imag respiratori cardiac pulsat observ use signaltim curv pulsat refer function magnitud phase transfer function calcul pixelbypixel basi calcul magnitud phase repres amplitud chang tempor delay pixel compar refer function transfer function analysi near constant phase found respiratori cardiac frequenc band indic exist phase delay relat refer function analyz dynam mr imag use transfer function analysi found follow good delin tempor delay pulsat can achiev respiratori pulsat exist ventricular cortic cerebrospin fluid cardiac pulsat exist ventricular cerebrospin fluid intracrani vessel degre phase delay invert amplitud observ phase imag

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