What is the normal TBI index?

What is the normal TBI index?

• A. 0.6-0.7
• B. 1.0-1.2
• C. 0.4-0.5
• D. 0.8-0.9

Answer: (D)

The TBI index is a numeric ratio used in ultrasound to quantify tissue perfusion or vascularity in a region of interest. A normal value sits in the upper-mid range, around 0.8 to 0.9, which reflects typical, baseline perfusion in healthy tissue without significant hypoperfusion or hyperemia. Values lower than this suggest reduced perfusion or attenuated signal, while values higher than this can indicate increased flow or potential artifacts that elevate the reading. So, 0.8–0.9 best represents the expected normal range for a TBI index.

The TBI index is a numeric ratio used in ultrasound to quantify tissue perfusion or vascularity in a region of interest. A normal value sits in the upper-mid range, around 0.8 to 0.9, which reflects typical, baseline perfusion in healthy tissue without significant hypoperfusion or hyperemia. Values lower than this suggest reduced perfusion or attenuated signal, while values higher than this can indicate increased flow or potential artifacts that elevate the reading. So, 0.8–0.9 best represents the expected normal range for a TBI index.