tSNR changes across time
I got interested in gradient temperature because of the weird effect that tSNR seemed to increase over time.
participant 1, tSNR maps refer to a 30 min fMRI run
Upon posing this effect on Twitter, PracitalfMRI and Ben Poser suggested that it might be due to gradient temperature. So I learned how to track it with as described below.
Continue reading “Gradient Temperature”
Almost every modern fMRI protocol (at SIEMENS scanners) uses GRAPPA. However, only very few people pay a lot of attention on optimal usage of the GRAPPA auto-callibration data. I realized the importance of optimizing GRAPPA parameters when doing high-resolution EPI. At high resolutions, GRAPPA-related noise can become an increasingly important limitation. This is especially true with the low bandwidth that the body gradient coils force us to use.
In this blog-post I will explain how the GRAPPA kernel-size affects the fMRI data quality, how you can change it, how you can find out which kernel-size was used, and I will descrive simple software tools to identify regions that might benefit from adaptations of the GRAPPA-kernel size.
Continue reading “GRAPPA kernel size”
There is a long list of software packages that are capable of performing high-resolution MRI analysis.
Some of them are used by multiple groups and some of them are customized for specific studies only.
In this post, I want to give an overview over the most important software packages, their advantages and disadvantages, and their popularity in the field.
Continue reading “layer-fMRI software pipelines”
There are about 80 people with a strong interest in layer-fMRI.
The whole list can be seen here.
These people are included in the listserv: email@example.com
To subscribe, please write an informal email to firstname.lastname@example.org
There are about 80 published layer-fMRI papers in humans.
A complete list can be found here.
Papers published per year
Most papers are still focusing on methodologoy
7T is the most popular field strength
The Netherlands are most active in layer fMRI
Currently there are more then 70 ultra-high field scanners installed.
An open google map of all scanners:
Continue reading “High field MRI scanners worldwide”