ASL pulse sequence

Dr. Wang has been disseminating ASL sequences to over 100 Siemens research sites around the world. Please email Dr. Wang if you are interested in obtaining the latest pseudo-continuous ASL sequence and/or collaboration using the various techniques developed at LOFT. Please include the follow information in your request:

Background suppression for SMS EPI pCASL

We presented a constrained slice-dependent (CSD) background suppression (BS) scheme in 2 dimensional (2D) arterial spin labeling (ASL) using simultaneous multi-slice (SMS) acquisition with blipped-CAIPIRINHA (controlled aliasing in parallel imaging results in higher acceleration). This Matlab tool was designed to simulate parameters (FAs, BS delay, etc.) for a given protocol.

Download

The software is free, but we hope that users register to download the software in order to help us track its usage.

Reference

  1. Shao X, Wang Y, Moeller S, Wang DJ A constrained slice-dependent background suppression scheme for simultaneous multi-slice pseudo-continuous arterial spin labeling Magn Reson Med (In press).

Complexity

© Copyright Laboratory of Functional MRI Technology (LOFT), Department of Neurology, UCLA
Developed by Anitha Priya Krishnan, Jun Fang, Robert Smith, Danny JJ Wang

Complexity is a toolkit used to analyze the complexity of resting state fMRI (rs-fMRI) data. The current version includes a pre-processing module and four different methods or modules to calculate the entropy of rs-fMRI:

  • ApEn(Approximate Entropy)
  • Cross-ApEn(Cross Approximate Entropy)
  • SampEn(Sample Entropy)
  • MSE(Multiscale Sample Entropy)
  • Wavelet-MSE(under development)

Requirement

Toolbox of "Tools for NIfTI and ANALYZE image" is needed, and it can be downloaded from Matlab Central

Download

The software is free, but we hope that users register to download the software in order to help us track its usage.

Reference

  1. Pincus SM. Approximate entropy as a measure of system complexity. Proceedings of the National Academy of Sciences of the United States of America 1991;88(6):2297-2301.
  2. Liu CY, Krishnan AP, Yan L, Smith RX, Kilroy E, Alger JR, Ringman JM, Wang DJ Complexity and Synchronicity of Resting State BOLD FMRI in Normal Aging and Cognitive Decline J Magn Reson Imaging. 2013;38(1):36-45
  3. Richman JS, Moorman JR. Physiological time-series analysis using approximate entropy and sample entropy. Am J Physiol 2000;278:H2039–H2049.
  4. Costa M, Goldberger AL, Peng CK. Multiscale entropy analysis of biological signals. Phys Rev E Stat Nonlin Soft Matter Phys. 2005 Feb;71(2 Pt 1):021906. Epub 2005 Feb 18.