fMRI一些基本概念 - 知乎 - 知乎专栏
Feb 2, 2020 · slice number 层数：扫描大脑是一层一层扫描的，通常是隔层扫描，因为信号可能会受到相邻层的影响，然后再把这些层重建成一个完整的3D大脑 volume 体积：一个重建好的3D大脑就是一个volume，一个TR时间内扫了slice number 层，然后就重建出了一个volume
Slice Timing | The R-fMRI Network
Oct 16, 2017 · Most fMRI data are acquired using two-dimensional pulse sequences that acquire images one slice at a time, thus all slices are acquired at different time within a repeat time (TR). Timing differences are especially problematic for longer TR.
Chapter 4: Slice-Timing Correction - Read the Docs
Unlike a photograph, in which the entire picture is taken in a single moment, an fMRI volume is acquired in slices. Each of these slices takes time to acquire - from tens to hundreds of milliseconds. The two most commonly used methods for creating volumes are sequential and interleaved slice acquisition.
课程笔记8--fMRI的数据预处理 - 腾讯云
在扫描一次完整大脑（Brain volume）的周期（TR，Repetition time）内，我们会扫好几片脑片（Slice），由于我们一个时间点只能扫描一张脑片，如果是按照顺序一张一张扫下去的话，每张脑片之间的扫面时间点都会有区别。
Slice Timing - SPM Documentation - Wellcome Centre for Human …
It is important to note that whatever reference slice you use, you should check that the Microtime Onset (fMRI_T0) in the statistical analysis module corresponds to your Reference Slice (refslice) of the slice timing module to ensure that your onsets during the statistical test are shifted appropriately (else they might be too early or too late ...
Slice-timing effects and their correction in functional MRI
Here we show, depending on repetition time and paradigm design, slice-timing effects can significantly impair fMRI results and slice-timing correction methods can successfully compensate for these effects and therefore increase the robustness of the data analysis.
Slice timing correction - SPM Documentation - Wellcome Centre …
Slice timing correction aims to account for the differences in timing of data acquisition from different slices. Why use slice timing correction? fMRI data is often collected in slices, with one or several slices acquired at a time.
The Benefit of Slice Timing Correction in Common fMRI …
Aug 19, 2019 · Using 180 simulated and 30 real fMRI data, we quantitatively demonstrate that the optimal order in which STC should be applied depends on interleave parameters and motion level. We also demonstrate the benefit STC on sub-second-TR …
measured slices with text overlays for image numbers, excitation order number and relative offset time. The latter value can be extracted from the DICOM header in tag (0019,1029) „Mosaic RefAcqTimes“ together with tag (0008,0032) „Acquisition time“ …
OPTIMAL SLICE TIMING CORRECTION AND ITS INTERACTION WITH FMRI …
Due to the nature of fMRI acquisition protocols, slices in the plane of acquisition are not acquired simultaneously or sequentially, and therefore are temporally misaligned with each other. Slice timing correction (STC) is a critical preprocessing step …