Getting signal averages in 'raw' data

Q&A
1

Hi

I have been using the simple ‘save’ option with the sequence widgets on the UI, in order to get k-space data in .npy format. This works well, but I noticed that when doing multiple signal averages, the saved data always only contains one k-space, which I assume is the average of all acquisitions.

I would like to get access to all of the individual measurements - is there a way to achieve this?

Thanks!

Shaihan

2

Hi Shaihan,

Currently all standard dashboards use pulse sequences where the scans are averaged automatically. This is to reduce memory usage when using large numbers of scans, as the data can be accumulated into a single array.

The pulse sequences could be modified to add an additional repetition loop to allow repeating the pulse sequence without averaging. Are you using the 2D RARE Advanced dashboard? I can create a modified version of this dashboard for you to try if that would be useful.

I am thinking of splitting the “Scans” parameter into “Repetitions” and “Averages” parameters so you can seperately specify e.g. 4 averaged scans repeated 4 times if you need the averaging for SNR, would that be suitable?

3

Hi Cameron

Thanks for the fast response! I’ve been using 2D RARE advanced and also the 3D FISP sequence. Your idea to include both repeats and averages would be great, yes. Then perhaps the user could also tick a box to indicate that all repeats and averages would be summed for SNR in the images displayed in the UI but the repeats would be available separately in the raw data…

Shaihan