You may want to upgrade to the latest stable version (currently v1.0.20180622). In general, DICOM data from EPI sequences acquired on a Siemens scanners contains slice timing information, while Philips and GE systems do not store this information. You mention you are using a Siemens system - can you tell me the version and model. For example, for raw DICOM data from the console, you can look at the "SoftwareVersions" tag of the BIDS header, this should be something like "syngo_MR_E11", suggesting generation E version 11. Siemens systems from B11..E11 typically include slice timing. In contrast earlier releases ('VA2006') and the recent XA10 files do not embed slice timing information. If you have an XA10 system, you may want to contact your Siemens research collaboration manager and request that it would be helpful for their systems to store this information for you.