The effect of scan duration on ALFF of resting-state fMRI
10.3969/j.issn.1002-1671.2014.12.031
- VernacularTitle:静息态 fMRI 扫描时长对低频振幅结果稳定性影响的研究
- Author:
Hui DING
;
Junjun LI
;
Lei GAO
;
Jianxin GUO
;
Ming ZHANG
- Publication Type:Journal Article
- Keywords:
scan duration;
amplitude of low-frequency fluctuation;
resting state fMRI;
stability
- From:
Journal of Practical Radiology
2014;(12):2061-2064
- CountryChina
- Language:Chinese
-
Abstract:
Objective To examine the reliability and similarity of amplitude of low-frequency fluctuation (ALFF)for different scan duration.Methods 10 min 10 s resting state fMRI data acquired from 13 healthy volunteers separately were divided into 10 pieces of the same length.The reliability and similarity of ALFF were assessed for each scan length (1-10 min).Results Spatial maps of ALFF steadily appeared in each time period (1-10 min);but during the time evolution,both spatial distribution and extent of ALFF increased gradually.At only one minute,there were detectable statistical differences within the group.When the time ran-ging from 5 to 10 min,relatively stable ALFF results in the group achieved.Conclusion ALFF is a relatively stable index,it can be easily affected by scan duration.In the case of 1-5 min,it should be carefully analyzed and interpretated particularly.
