Three-dimensional imaging of the prostatic urethra--an exciting new tool.

Objective: To evaluate the technique of three-dimensional (3-D) ultrasound imaging of the urethra and its application in both research and clinical practice.

Patients And Technique: The study involved 23 patients: 10 with benign prostatic hyperplasia, four with urethral strictures, three post-insertion of prostatic stents, one with bladder neck dyssynergia, three post-transurethral resection of the prostate, and two with non-urological conditions. A transrectal ultrasound scan was initially performed to acquire a series of images of the urethra. These images were then reconstructed into a 3-D format.

Results: The 3-D image of the urethra could be rotated on screen and viewed from any angle. The image could also be sliced at any plane to reveal the sectional view.

Conclusion: This new tool represents a major advance in imaging techniques and promises to provide new knowledge in understanding the hydrodynamics of the lower urinary tract. The precise geometry of the 3-D urethra will also help in the design of new stents.