A guidance device for CT-guided procedures

Radiology. 1990 Sep;176(3):863-4. doi: 10.1148/radiology.176.3.2389049.


A device was designed to facilitate placement of biopsy needles with computed tomographic guidance. The device consists of a hollow, clear plastic disk filled halfway with fluid and a central stem with a groove for the needle. When the device is rotated, the air-fluid level points to the corresponding angle marked on the side of the disk. In a phantom study, 17 of 20 passes were within +/- 3 degrees of the anticipated angle of entry, and the remaining three were within +/- 5 degrees. The device was also used in 14 patients; the resultant angle of entry was within +/- 3 degrees of the anticipated angle.

MeSH terms

  • Biopsy, Needle / instrumentation*
  • Equipment Design
  • Humans
  • Tomography, X-Ray Computed*