code: def version():
      """Check for dtk version on system
  
      Parameters
      ----------
      None
  
      Returns
      -------
      version : str
         Version number as string or None if FSL not found
  
      """
      clout = CommandLine(
          command="dti_recon", terminal_output="allatonce"
      ).run()
  
      if clout.runtime.returncode != 0:
          return None
  
      dtirecon = clout.runtime.stdout
      result = re.search("dti_recon (.*)\n", dtirecon)
      version = result.group(0).split()[1]
      return version
  
imports: import re
  from ..base import CommandLine
label_desc: Use image node_id 1 for calling the Info obj's underlying member method code with example usage: obj.version() and returns: version, None