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ΒΌ of the voxel size is a good step length. It does not affect fiber length, though there is a minimum fiber length setting: --distthresh1 or --distthresh3 depending on if you are using matrix1 or matrix3 style seeding. Matt. From: FSL - FMRIB's Software Library <[log in to unmask]> on behalf of Sam W <[log in to unmask]> Reply-To: FSL - FMRIB's Software Library <[log in to unmask]> Date: Thursday, August 25, 2022 at 6:41 AM To: "[log in to unmask]" <[log in to unmask]> Subject: [FSL] probtrackx steplength Hello! What is the recommended steplength for data with voxel sizes of 1mm, 2mm and 3mm? And what happens if steplength is decreased below 0.5? Will it terminate with shorter streamlines? Best regards, Sam ________________________________ To unsubscribe from the FSL list, click the following link: https://www.jiscmail.ac.uk/cgi-bin/WA-JISC.exe?SUBED1=FSL&A=1<https://nam10.safelinks.protection.outlook.com/?url=https%3A%2F%2Fwww.jiscmail.ac.uk%2Fcgi-bin%2FWA-JISC.exe%3FSUBED1%3DFSL%26A%3D1&data=05%7C01%7Cglasserm%40wustl.edu%7Cb92f5c87a5de48a7849908da868ecee5%7C4ccca3b571cd4e6d974b4d9beb96c6d6%7C0%7C0%7C637970245299843559%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C2000%7C%7C%7C&sdata=ALNN9bGRprpxJ3iheUaoUuRwlIlOb9SgMPewmbvzxhg%3D&reserved=0> ________________________________ The materials in this message are private and may contain Protected Healthcare Information or other information of a sensitive nature. If you are not the intended recipient, be advised that any unauthorized use, disclosure, copying or the taking of any action in reliance on the contents of this information is strictly prohibited. If you have received this email in error, please immediately notify the sender via telephone or return mail. ######################################################################## To unsubscribe from the FSL list, click the following link: https://www.jiscmail.ac.uk/cgi-bin/WA-JISC.exe?SUBED1=FSL&A=1 This message was issued to members of www.jiscmail.ac.uk/FSL, a mailing list hosted by www.jiscmail.ac.uk, terms & conditions are available at https://www.jiscmail.ac.uk/policyandsecurity/