Ultrasound guided percutaneous vein therapies have revolutionized the treatment of symptomatic varicose veins and venous insufficiency.  After 6 years and over 2500 radiofrequency ablation cases, I can safely say the most important aspect of my vein practice is ultrasonography.  It is essential to perform accurate venous reflux diagnostic testing.  Percutaneous techniques have also created a new breed of RVT, the ‘interventional sonographer’.  The sonographer now must work in a clinical setting providing the guidance for the operator’s intervention.  This requires the sonographer to enter into a unique relationship with the practitioner and the patient.  (S)He needs to become comfortable with working in this procedure oriented environment.   Doug Marcum and AUC offer services that cannot be duplicated.  Doug is the most talented sonographer I have ever worked with in my 13 years as a vascular surgeon.  He is personable and unflappable in stressful situations.  He possesses a sophisticated working knowledge of vascular anatomy and physiology and makes vein interventions simple.  His sonographic "three dimensional brain" complements my skills well.  He clearly has skills that I cannot duplicate.  My vein practice thrives in great part because of Doug’s talent.     Over the years I have witnessed Doug’s abilities as an educator and speaker.  His knowledge is effectively and naturally conveyed to students at all levels.  His experience is invaluable and anyone seeking his assistance would easily be better prepared having done so. John D. Horowitz M.D. Central Florida Vein and Vascular Center ___________________________________________ It has been my pleasure to know and work with Mr. Doug Marcum and Advanced Ultrasound Consultants for nearly five years.  During this time Mr. Marcum has proven himself to be an extremely valuable asset to my vascular practice. His expert knowledge of venous anatomy and pathophysiology, as well as his expertise in ultrasound technique truly makes him invaluable. When assisting with ultrasound-guided procedures such as EVLT and Sclerotherapy, his technical abilities excel and he makes the cases run more efficiently.  His easy going manner and professional demeanor gives him excellent rapport with my patients, which also allows the procedure to run smoothly and remain enjoyable. Overall, I can without hesitation recommend Mr. Marcum and Advanced Ultrasound Consultants as an excellent resource to any vascular/vein practice.  It is truly a pleasure to work with Mr. Marcum Alan Keller M.D., F.A.C.S. Central Florida Vein and Laser Center _______________________________________ When I decided to add vein therapy into my vascular surgery practice, I knew it would be challenging.  Fortunately, I made the decision to consult with Advanced Ultrasound Consultants and Doug Marcum.  The first thing Doug did for me was to assist me in purchasing an ultrasound system that suited my needs.  Not only did I purchase an excellent system, I got it at a fraction of what I would have spent if I purchased a new system.  Doug also refined the scanning protocols in my lab to include detailed superficial vein and perforator incompetence studies.  His knowledge of the venous system and pathophysiology is second to none and paramount in treating venous disease.  Doug also assisted and guided me in performing Laser and Radiofrequency thermoablation cases and without hesitation I have to say his techniques and scanning abilities in these procedures are phenomenal.  Many times, with ultrasound guidance, he incorporated subtle directional manipulations and maneuvers to help advance the treating catheter or fiber when I felt we were “stuck” in a difficult vein segment.  In closing, I have worked with Doug for the past 2 years and I highly recommend Doug Marcum and Advanced Ultrasound Consultants to any practice wishing to incorporate vein therapy or those wishing to hone their scanning/insufficiency skills. Gregory L. Nedurian, M.D. Peripheral and Endovascular Surgery Lakeland, FL. ____________________________________________________________________________________ It has been a pleasure working with Doug Marcum from Advanced Ultrasound Consultants.  He is not only very professional but his knowledge of venous anatomy and ultrasonography is second to none.  Doug has spent a day in my office instructing my RVT and myself on ultrasonic visualization for ablation of incompetent perforating veins. His crystal clear approach has allowed me to become quite comfortable with the appoach in a short period of time. Doug fulfilled every one of my expectations and more. I would recommend him without reservation. Joseph Schiro, MD., FACS Sarasota, FL _________________________________________________________________________________________________________________ "Doug was VERY helpful and answered all of my questions effectively.  I was very pleased with the hands-on experience and the program as a whole." "Doug was very informative, He presented things on our level that we previously had difficulty understanding.  When it comes to instruction on scanning for venous insufficiency and perforators, I highly recommend Doug!" Daphne Collins RT(R), RDMS Sarah Parker RT(R), RDMS Gilmore Memorial Regional Medical Center Amory, Mississippi _______________________________________________________________