layer-fMRI Webinar MBIC 2020

Title: High resolution fMRI: An introductory course for data acquisition and analysis challenges.

Support: This lecture series is finanzially supported by the FPN-MBIC-school. The session on sequences and sequence artifacts is supported (in kind) by the York-Maastricht-partnership grant. Faruk Omer Gulban works for Brain Innovation.

Coordinators: Laurentius (Renzo) Huber & Omer Faruk Gulban, Cognitive Neuroscience Department

Email: renzohuber@gmail.com or faruk.gulban@maastrichtuniversity.nl

Dates: 7, 14, 21, 28 July 2020 (4 sessions in total), 3pm to 4:30pm.

Video Conference Zoom link (note that these sessions may be recorded): https://maastrichtuniversity.zoom.us/meeting/register/tJAvcu-qpj8sHNVD71Vcu95et-R14QKRs22T

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Layer-fMRI VASO worldwide

This blog post gives an overview of the scientific network of researchers that are using the VASO (vascular space occupancy) for applications in layer-fMRI. I tried to give an overview of all layer-fMRI VASO papers published so far and provide a map of all layer-fMRI VASO labs around the globe. Continue reading “Layer-fMRI VASO worldwide” →

Layer-fMRI Jobs

 

This page lists all open layer-fMRI job opportunities.

Suggestions are welcome to layerfMRI@gmail.com

Tweet intro
Don’t we all feel like Daniel in his Tweet(screenshot taken with permission)

layer-fMRI abstracts

The following is a personal selection of my must-see layer-fMRI abstracts presented at SFN/OHBM/ISMRM. If I missed something, please let us know (layerfMRI@gmail.com).

 

SFN 2019 in Chicago

Saturday

  • 4:00 pm – 5:00 pm, 092.12/ BB63. Poster, O. STANLEY, Phase-based macrovascular filtering from gradient echo bold fMRI reduces orientation dependence.

Sunday

  • 8:00 am – 8:15 am, 111.01/Room S402. Nanosymposium talk, J. TOWNSEND: Non-invasive mapping of acoustic-phonetic speech features in human superior temporal gyrus using ultra-high field 7T fMRI.
  • 11:00 am – 12:00 am, 141.04/K28. Poster, T. LIU: Affective processing of face stimuli in human primary visual cortex.

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Technical aspects of the BOLD correction in SS-SI VASO

Authors: Denis Chaimow1, Sebastian Dresbach2, Renzo Huber2

  1. Max-Planck Institute Leipzig (CBS)
  2. Maastricht University

This post is the result of many discussions across the authors and posted here for the purpose of providing details of the commonly used BOLD correction in SS-SI-VASO sequences. It describes the inherent assumptions, it’s limits and, some nuances in improved the analysis pipeline.

Continue reading “Technical aspects of the BOLD correction in SS-SI VASO” →

MP2RAGE: challenges and artifacts of its use for layer-fMRI

The MP2RAGE sequence is very popular for 7T anatomical imaging and is very commonly used to acquire 0.7-1 mm resolution whole brain anatomical reference data. Aside of this common application, it can also be very helpful for layer-fMRI studies to obtain even higher resolution T1 maps in the range of 0.5mm iso. However, when optimizing MP2RAGE sequence parameters for layer-fMRI studies, there are a few things that might be helpful to keep in mind.

In this post, I would like to discuss the challenges of using the popular MP2RAGE sequence in layer-fMRI studies. Specifically I will discuss challenges/features regarding:

Continue reading “MP2RAGE: challenges and artifacts of its use for layer-fMRI” →

Example analysis pipeline of layer-VASO

In this blog post I want to go through the analysis pipeline of layer-dependent VASO.

I will go through the all the analysis steps that need to be done to go from raw data from the scanner to final layer profiles. The entire thing will take about 30 min (10 min analysis and 20 min explaining and browsing through data).

During the entire analysis pipeline I am using the following software packages: SPM, AFNI, and LAYNII, and gnuplot (if you want fancier plotting tools)

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How many layers should I extract?

In this blog post, I want to share my thoughts on the number of layers that should be extracted from any given dataset. I will try to give an overview of how many layers are usually extracted in the field, I’ll describe my personal choices of layer numbers, and I will try to discuss the challenges of layer signal extraction along the way.

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‘layer fMRI’, ‘sub-millimeter fMRI’, ‘mesoscopic fMRI’, or ‘cortical depth dependent fMRI’…. Which term should I use?

What’s the best name of our field and what’s the best attributing term for our data? There are many competing options: “Layer fMRI”, “mesoscopic fMRI”, “sub-millimeter fMRI”, “ultra-high resolution fMRI”, “laminar fMRI”, “cortical depth-dependent fMRI”. They differ with respect to how flashy they are, how scientifically appropriate they are, and how popular they are.

In this blog post, I want to review which ones are the most popular ones in the field and also share some thoughts on my favourite candidates.

Edits on March 3rd 2019 with contributions and clarifications taken from Kamil Uludağ, Sri Kashyap and  Faruk Gulban.

Continue reading “‘layer fMRI’, ‘sub-millimeter fMRI’, ‘mesoscopic fMRI’, or ‘cortical depth dependent fMRI’…. Which term should I use?” →

Registration of high-resolution data

In this blog post Sri Kashyap and I describe how to deal with the registration of high-resolution datasets across days, across different resolutions, and across different sequences.

I am particularly fond of the following two tools: Firstly, ITK-SNAP for visually-guided manual alignment and secondly, using ANTs programs: antsRegistration and antsApplyTransforms.

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TR-FOCI pulse optimisations for SS-SI VASO

CBV-fMRI with VASO is highly dependent on a good inversion contrast. It gives it its CBV sensitivity and is also responsible for most of the VASO specific pitfalls (e.g. inflow, CSF etc. ). And thus, it should be optimized as much as possible.

In this blog post, I want to describe the most important features of a reliable inversion pulse for the application of VASO at 7T with a head transmit coil.

Continue reading “TR-FOCI pulse optimisations for SS-SI VASO” →

Installing ISIS-conv on MAC

ISIS-conv is a very useful dicom to nii converter from Enrico Reimer. ISIS-conv gets along with a lot of challenging data sets that no other converter (that I know of) can handle so conveniently:

  • SMS-data, where individual slices have a non-constant inter-slice distances.
  • VASO data with non-constant TRs
  • Multi-echo, multi-coil, and Magnitude/Phase data.

There is a Mac-installation package of ISIS-conv. Unfortunately, however, with every IOS update, it has become more complicated to install it.

Since, I spend too much time figuring out how to install it after every update, I am collecting the necessary steps in this Blog post for future reference:

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Anatomically informed spatial smoothing

In this blog post, I want to describe the application and working principle of a few spatial smoothing algorithms that are implemented in LAYNII.

  1. Confined smoothing along similar anatomical structures with LN_GRADSMOOTH
  2. Smoothing along the layers with LN_LAYERSMOOTH
  3. Smoothing within columns with LN_LAYERSMOOTH
  4. Smoothing across specific spatial dimensions only with LN_DIRECT_SMOOTH
  5. Smoothing long the time domain with LN_TEMPSMOOTH

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Quick example of cortical unfolding in LAYNII

Update June 2021: There is a new and more comprehensive 3D-supported LayNii Program for cortical unfolding. Please see https://thingsonthings.org/ln2_multilaterate/

The blog post below is kept for archiving purposes: 

In this Blog post, I seek to describe a quick example of how to analyse high-resolution data across layers and columns with LAYNII.

Continue reading “Quick example of cortical unfolding in LAYNII” →

Negative Voxels in VASO

In the last years, I and multiple other VASO users have encountered many occasions of voxels that show negative CBV change (positive VASO signal change) while the BOLD suggests that the activation should be positive. In this blog post, I want to list potential sources of this surprising effect.

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How send raw k-space data to any given server with Twix or with a modified ICE-chain

In this blog-post I want to describe a setup, how you can include an additional ICE functor in your reconstruction pipeline that sends raw Twix files from the Reconstruction computer to any given custom server.  Continue reading “How send raw k-space data to any given server with Twix or with a modified ICE-chain” →