Thanks for sending me sample images, these look really nice. With my software you use the option "-s y" to convert a single file, otherwise it will convert all the images in the specified folder. This behavior is nice for most DICOM images where the 3D volumes and 4D time series are saved as thousands of individual files each with a 2D image. Your Philips system has bundled all the slices from each series as a single file, so you may prefer the "-s y" option to explicitly control which image is converted.