Hi Gonzalo - The different options for correction are also described in the tutorial: https://surfer.nmr.mgh.harvard.edu/fswiki/FsTutorial/Tracula#line-234

Anastasia. ________________________________ From: freesurfer-bounces@nmr.mgh.harvard.edu freesurfer-bounces@nmr.mgh.harvard.edu on behalf of Gonzalo Rojas Costa gonzalo.rojas.costa@gmail.com Sent: Thursday, April 7, 2022 10:52 AM To: freesurfer@nmr.mgh.harvard.edu freesurfer@nmr.mgh.harvard.edu Subject: [Freesurfer] "B0 distortion correction with reverse-polarity DWIs"

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Hi:

I tried to process a tractography with TRACULA. I got the error "ERROR: for B0 distortion correction with reverse-polarity DWIs. ERROR: or for model-based eddy-current distortion correction, ERROR: must specify PE direction". What does it mean? I read the webpage https://secure-web.cisco.com/1guG1MnfZf84DwQHfWaHHLuw6SMY7Z-tutMOyUkvQB8sNK-..., but It was not clear to me how to solve the problem.

Sincerely,

Gonzalo Rojas Costa Department of Radiology Clínica las Condes Lo Fontecilla 441, Las Condes, Santiago, Chile. Tel: 56-2-2105170 Cel: 56-9-97771785 http://secure-web.cisco.com/12GtciP9OUiW5DkspMfrRVy3WsQH7lo4AsKjg0Sj8uml6hms... https://secure-web.cisco.com/1MqLKS1F46RbplHUM6h_KNyjN0BiKcyL58vxd1gCfQMyaz0... https://secure-web.cisco.com/1VYyKt8bpinu3O6RicUYTbOJmllqjZD8fa4vMdxnypEQayQ... https://secure-web.cisco.com/1cDJNj5GQNOJNQJmRBcgfx71cRT_O6MgqP1ftnJlfUY5Nun... http://secure-web.cisco.com/1FaAL_RhtLAORTKofMH0umP03Sz7z4fz1ix6_BxtTBFSkxZd... https://secure-web.cisco.com/1Chz4Nd2Gs4bv5UU_W7XXxgXJhQCBYB_9QHiTrY3XemPxP0...

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