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About North Oaks Radiation Oncology Medical Center

North Oaks Radiation Oncology Medical Center in Thousand Oaks, California is part of one of the largest radiation therapy providers for cancer patients in California: Coastal Radiation Oncology Medical Group.

At North Oaks Radiation Oncology Medical Center, our mission is to help our patients fight cancer. To accomplish this, we provide the highest standard of care in radiation oncology in an atmosphere of openness, honesty, caring, emotional support and clinical expertise.

Service to our patients comes first.


Thousand Oaks Physicians

Dr. Robert Hesselgesser   Dr. Robert Hesselgesser

A graduate of USC and New York Medical College , Dr. Hesselgesser completed his residency in radiation oncology at LA County USC Medical Center. Board-certified in radiation oncology in 1975, he is a member of the American Medical Association, the American Society of Clinical Oncology, the American College of Radiology, the American Society of Therapeutic Radiology and Oncology and the American Endocurietherapy Society. Dr. Hesselgesser is a specialist in radioactive implants with high and low dose rate Iridium-192, and has lectured internationally on the topic, including its use in lung, brain and nasopharyngeal tumors. He has performed over 250 I-125 prostate implants, one of the largest series done by a single physician.

Dr. Paul Miller   Dr. Paul Miller

After earning degrees in Chemistry, Psychology and Chemical Engineering at the University of Kansas , Dr. Miller worked briefly as a research engineer in the aerospace field in Southern California working on the development of the space shuttle. Dr. Miller then worked in a genetics research lab at the University of Kansas Medical Center where he later attended Medical School and completed his training in Radiation Oncology. Board-certified by the American College of Radiology, Dr. Miller has been an assistant clinical professor in the department of radiation oncology at UCLA School of Medicine since 1990. Dr. Miller has participated in multiple clinical trials through the years and has previously held the position of principal investigator at Los Robles Regional Medical Center in Thousand Oaks, for the Southwest Oncology Group, a national cancer research organization funded by the National Cancer Institute, in cooperation with UCLA. He has published research on high-grade brain tumors, and has actively participated in studies on breast cancer, lung cancer, and brain tumors. Dr. Miller has used his Engineering background to spearhead the advancement of optimal technologies for the treatment of cancer patients within this group. He is a member of the American Medical Association, the American Society of Therapeutic Radiology and Oncology, and the American Society of Clinical Oncology.

Dr. Eugene Ahn   Dr. Eugene Ahn

A graduate of the University of Washington, Dr. Ahn attended medical school at the New York University School of Medicine and did his residency at UCLA Medical Center. He is board-certified in therapeutic radiology with a particular interest in stereotactic radiosurgery for brain tumors and head and neck cancers. In addition, he has significant experience in MammoSite Brachytherapy for early stage breast cancer. Dr. Ahn initiated the first MammoSite treatment in Ventura County in 2004. The breast brachytherapy program in Thousand Oaks is now the largest in Ventura, Santa Barbara, and San Luis Obispo counties. He has published on stereotactic radiosurgery and is the recipient of the Young Oncologist Research Award 2003 from the American Radium Society. Dr. Ahn is based in the Westlake Village/Thousand Oaks centers and is co-medical director of the Los Robles Gamma Knife Center in Thousand Oaks. Dr. Ahn is a member of the American Society for Therapeutic Radiology and Oncology, Los Angeles Radiological Society, American Radium Society, and American Society of Clinical Oncology.

Thousand Oaks Treatments

North Oaks Radiation Oncology Medical Center in Thousand Oaks, California provides cancer patients with a some of the most advanced radiation therapy treatments available, including:

  • Intensity Modulated Radiation Therapy (IMRT) – a sophisticated type of external beam radiotherapy which allows delivery of precisely targeted radiation beams to tumors, while sparing the surrounding healthy organs and tissues.

  • Image Guided Radiotherapy (IGRT) – visualized CT scans that verify target locations immediately before treatment delivery. In conjunction with IMRT, this allows for unprecedented accuracy in delivering radiotherapy.

  • Three-Dimensional Conformal Radiation Therapy (3D-CRT) – a sophisticated set of computer assisted tomography scans (CT or CAT scans) and/or magnetic resonance imaging scans (MR or MRI scans) that create detailed, three-dimensional representations of tumors and surrounding organs for precise delivery of radiation beams to the exact size and shape of the tumor.

  • Gamma Knife® – the most advanced system available to treat brain tumors. Gamma Knife surgery, sometimes referred to as stereotactic radiosurgery, is a non-invasive method for treating brain disorders. The extreme precision of Gamma Knife makes it possible to administer a high radiation dose to the diseased area, minimizing the risk of damaging healthy tissue.

North Oaks Location

North Oaks Radiation Oncology Medical Center
2230 Lynn Road
Thousand Oaks, California 91360

Phone: (805) 496-4111
Fax: (805) 496-2861


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North Oaks Radiation Oncology Medical Center is a member of the Oncure Medical Corp. national network of cancer treatment centers.
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