More than just statics: altered complexity of dynamic amplitude of low-frequency fluctuations in the resting brain after stroke.

Previous neuroimaging studies mainly focused on static characteristics of brain activity, and little is known about its characteristics over time, especially in post-stroke (PS) patients. In this study, we aimed to investigate the static and dynamic characteristics of brain activity after stroke using functional magnetic resonance imaging (fMRI).Twenty ischemic PS patients and nineteen healthy controls (HCs) were recruited to receive a resting-state fMRI scanning.

Reduced Complexity in Stroke with Motor Deficits: A Resting-State fMRI Study.

Recently, alterations of complexity due to brain disorders have been demonstrated using brain entropy (BEN), while the changes of brain complexity in stroke, a common cerebrovascular disease, remain unclear. In this research, resting-state functional magnetic resonance imaging (fMRI) was performed to explore the alterations of brain complexity using BEN in twenty stroke patients with motor deficits and nineteen matched healthy controls. The sample entropy (SampEn) was applied to build the BEN mapping for each participant.

[The applied research of digital subtraction technique on head and neck with 64-slice spiral CTA].

Objective: To explore the imaging value of digital subtraction technique on head and neck with 64-slice spiral CTA.

Methods: 958 patients of head and neck vessels were examined with the direct method, Surestart law, low-dose tes methods, Surestart subtraction method, low-dose test subtraction method by CTA, the former three kinds are non-subtraction method, the latter two kinds are subtraction method, a comparative analysis on the five methods from the image quality, imaging time, imaging values, seek for the CTA method with optimal image quality, the shortest imaging time, the best value.

Results: The image quality with the direct method (2.