Variance maps are primarily used for _____ scanning.

Variance maps are primarily used for _____ scanning.

• A. Cardiac
• B. Carotid
• C. Abdominal
• D. Renal

Answer: (A)

Variance maps highlight turbulence by showing how velocity values vary over time in a region. In cardiac imaging, turbulent flow is common due to valvular regurgitation, stenosis, or intracardiac shunts. The variance mode makes these irregular, chaotic jets stand out with a colorful mosaic, helping you spot abnormal flow patterns quickly and assess their location and severity. In contrast, flow in carotid, abdominal, and renal arteries is typically more laminar except when disease causes significant disruption. For those scans, clinicians rely more on standard color Doppler and spectral Doppler to evaluate flow and stenosis, so variance maps aren’t the primary tool there.

Variance maps highlight turbulence by showing how velocity values vary over time in a region. In cardiac imaging, turbulent flow is common due to valvular regurgitation, stenosis, or intracardiac shunts. The variance mode makes these irregular, chaotic jets stand out with a colorful mosaic, helping you spot abnormal flow patterns quickly and assess their location and severity.

In contrast, flow in carotid, abdominal, and renal arteries is typically more laminar except when disease causes significant disruption. For those scans, clinicians rely more on standard color Doppler and spectral Doppler to evaluate flow and stenosis, so variance maps aren’t the primary tool there.