- OBGYN Net: This is a very comprehensive site on all obstetrical and gynecological matters, with many sections. I am involved with the Ultrasound Section. A good place to find information or ask questions on any OB/GYN subject.
- American Institute of Ultrasound in Medicine
- American Registry of Diagnostic Medical Sonography (ARDMS)
- Philips Medical
- Society of Diagnostic Medical Sonography
- The Twin to Twin Transfusion Syndrome Foundation
- Joe Woo's Comprehensive Ultrasound Site
- Dr. Greg Devore's excellent site