Dear All,

I hope this message finds you well.

I am a first-time user of MRIcron and am currently exploring its functionalities for ROI drawing. Despite reviewing the forum discussions, I still have some uncertainties regarding the import issue with NifTI and “undo” option, and I would greatly appreciate your insights on the following queries:

Q1: When importing a NIfTI file, I encountered the message: "Integer required: Multi-volume file, please select volume to view. [1..2]". However, my dataset only contains a single DICOM folder with multiple DCM files. Could you please clarify what selecting [1] or [2] means in this context? How does this choice impact my workflow?

Q2: While drawing the ROI, I chose the "autoclose pen" option, but mistakes are inevitable at times. I noticed that I can only undo one step, which makes it challenging when multiple errors occur, as I have to restart the drawing process entirely. Is there a way to increase the number of undo steps to improve error tolerance?

I greatly appreciate your guidance on these matters,  and I look forward to your advice.

Warm regards,

Hua Song

Fudan University, Shanghai, China