The Flow Tool provides functionality for post-processing the resultant images of the ``Perfusion'' analysis of the MR Analysis Tool. It estimates the absolute fractional Cerebral Blood Volume (CBV) from the raw CBV maps, and derives the Net Mean Transit Time maps (NMTT) from the Time to Mean (TTM) maps. The Net Cerebral Blood Flow (NCBF) is calculated from these maps. Details of the algorithms are described in Tina Memo 2002-001.
The Tool is divided into three sections. First is the initialisation of the image volumes, next is the actual calculations on the images to obtain NCBF values, and finally there are functions for producing histograms of regional NCBF, based on the Talairach Atlas.