Beth Israel Medical Center in Manhattan, part of Continium Health Care, did my surgery. They did the angiogram, balloon occlusion test at Roosevelt Hospital's Center for Endovascular Surgery, which is one of their hospitals. My RO, and ENT worked all that out. They do amazing work at Beth Israel, especially my RO who is a HNC expert, and no stop in this doctor, surgeons too. This was part of the IORT, Intraoperative radiation treatment, and now doing Proton Radiation, chemo. All of the doctors there are from MSKCC or Mt. Sinai.
Good luck.