Why is Susceptibility Weighted Imaging (swi) Sensitive to Microhemorrhages in Traumatic Brain Injury?
Susceptibility weighted imaging (SWI) is highly sensitive to microhemorrhages because it exploits the pronounced magnetic susceptibility of blood breakdown products, specifically deoxyhemoglobin and hemosiderin. These substances create subtle variations in local magnetic fields, which we detect using advanced T2*-weighted gradient-echo sequences. Unlike conventional MRI, we use a multi-step process to enhance these findings: In the context of traumatic brain injury (TBI), this sensitivity is critical because SWI is 2–4 times more sensitive than standard gradient-recalled echo (GRE) sequences. It allows us to identify diffuse axonal injury (DAI) and chronic microhemorrhages that standard T2-weighted or FLAIR sequences often miss, providing objective evidence of trauma even weeks or months after an injury. Results may vary based on individual patient conditions. Please consult with a healthcare professional for diagnosis and treatment advice. Related FAQs