Brain Fronto-Occipital Distance (image) Radiological Society of North America Caption (a) Sagittal T1-weighted image shows brain fronto-occipital distance (FOD). (b) corpus callosum (CC), anteroposterior distance (AP), genu, midbody (MB), splenium (SP) measurements. Credit Radiological Society of North America Usage Restrictions May be used with credit Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.