Air as an ultrasound contrast marker for accurate determination of needle placement. Tumor biopsy localization and other applications.

Abstract

Computed tomography (CT) and ultrasonography can be performed to localize [human] tumors for percutaneous biopsy. With CT, the biopsy needle can be visualized within the sample volume. The needle can not be seen within the tumor on B-scan ultrasound images. An air contrast technique was devised to determine the location of the needle tip and the biopsy site. This technique can also be used for organ biopsies.