CyberKnife of Long Island


CyberKnife of Long Island offers non-invasive radiation therapy treatments, including stereotactic radiosurgery, stereotactic body radiosurgery, high dose rate brachytherapy and intensity-modulated radiation therapy. As part of the Northwell Health Cancer Institute and Department of Radiation Medicine, we are uniquely positioned to offer seamless access to a vast range of cancer specialists and support services, state-of-the-art technology and innovative patient safety programs. 

Why choose us?

The physicians and staff offer state-of-the-art care in locations convenient for patients. Conditions treated at these locations include:

  • Arteriovenous malformations
  • Brain tumors
  • Breast cancer
  • Gastrointestinal cancers, including anal, bile duct, colon and small intestine, esophageal, gallbladder, liver and pancreatic cancers and neuroendocrine tumors
  • Gynecologic cancers, including cervical, endometrial, ovarian, uterine, vaginal and vulvar cancers
  • Head and neck cancers
  • Lung cancer
  • Prostate cancer
  • Rectal cancer 
  • Skin cancer
  • Spinal tumors
  • Trigeminal neuralgia

Physicians and staff deliver patient and family-centered care, meaning that patients and their family members play a key role in developing treatment plans based on the unique needs of each case. 

The radiation oncologists have decades of experience caring for patients, hold additional certification in the use of the CyberKnife® Robotic Radiosurgery System, speak at international meetings and publish in medical journals worldwide.

The team was the first in the area to perform partial breast brachytherapy and prostate seed implants (Cesium 131, Palladium 103 and Iodine 125).

They were also the first center in the area to pioneer skin brachytherapy. The physicians have treated hundreds of patients over the course of nearly a decade. This painless, non-invasive treatment is performed at our two conveniently located outpatient offices. There is no scarring or need for reconstructive surgery after high dose rate (HDR) brachytherapy, and patients experience excellent outcomes that are equivalent to surgery. Reduction in normal tissue injury means more rapid and complete functional recovery.

Our offices are accredited by American College of Radiology (ACR). The ACR’s Radiation Oncology Accreditation Program provides radiation oncologists with third-party, impartial peer reviews and evaluations of patient care.

Our team

Meet the physician team at CyberKnife of Long Island:

Richard Thomas Byrnes, MD

Heather Dawn Zinkin, MD

John Worthington Ames, MD

  • Chairman of Radiation Medicine, Southside Hospital
  • Assistant Professor, Hofstra Northwell School of Medicine
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Comprehensive care

As part of the Northwell Health Cancer Institute, one of the largest cancer programs in the New York metropolitan area, the team works with a wide range of cancer specialists (nearly 200 members in more than 25 different specialties). Patients also have access to a robust research and clinical trials program and an array of cancer support services.

The facilities are also a part of the Northwell Health Department of Radiation Medicine. As one of the most innovative radiation medicine groups in the area, the Department of Radiation Medicine provides a wide range of services to adult and pediatric patients, uses state-of-the-art technology and ensures quality care through evidence-based treatment and one-of-a-kind patient safety programs.

(877) 542-9237

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Visit one of our locations

989 West Jericho Turnpike
Smithtown, NY 11787
270 Pulaski Road
Greenlawn, NY 11740

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Cancer Institute

Northwell Health Cancer Institute offers cutting-edge treatments and cancer care.