You are evaluating an obese patient with a known abdominal a…

You are evaluating an obese patient with a known abdominal aortic aneurysm. While using color Doppler to assess flow within the aortic aneurysm, minimal flow is detected in the anechoic lumen. You decrease the color scale and increase the color gain but there is no improvement. Which of the following adjustments will improve the color display on this exam?