Sagittal T2-weighted sequence cervical and upper thoracic spine.The spinal subarachnoid haemorrhage is demonstrated as abnormal low signal intensity posterior to the T1 vertebral body (red arrow). It is important to view the T1 and T2 images together. Blood can be of varying signal intensity depending on the acuity of the haemorrhage as different stages of blood products have varying paramagnetic qualities.