Mercy Radiation Oncology - Coletta

4401 McAuley Boulevard
Suite 1500
Oklahoma City, OK 73120
Fax: (405) 752-3077
Services are provided by Mercy Hospital Oklahoma City Learn more »
Hours of Operation:
Monday-Friday: 8 a.m. - 4:30 p.m.
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What is Radiation Therapy?

Radiation Therapy uses targeted energy (e.g., X-rays, radioactive substances) to destroy cancer cells, shrink tumors, and/or alleviate certain cancer-related symptoms.  It may be used:

  • As a primary treatment to destroy cancer cells
  • In combination with other treatments to stop the growth of cancer cells and tumors
  • Before another treatment to shrink a tumor
  • After another treatment to stop the growth of any remaining cancer cells
  • To relieve symptoms of advanced cancer
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Types of Radiation

  • External Beam Radiation Therapy
    • 3D conformal radiation therapy
    • Intensity Modulated Radiotherapy (IMRT)/Image Guided Radiotherapy (IGRT) 
    • Stereotactic Ablative Radiotherapy (SABR) 
  • Internal Radiation Therapy
    • High Dose Rate Brachytherapy - Examples of cancers that can be treated with high dose brachytherapy include:
      • breast cancer 
      • prostate cancer
      • lung cancer
      • gynecologic cancers
      • skin cancer
  • Stereotactic Radiosurgery (SRS) - Gamma Knife

Learn more about the types of radiation.

Experienced Care Team

Our radiation oncologists have years of research and experience, and work closely with our Mercy team using the latest technology to ensure your radiation treatments are given with the highest level of precision and safety. Dr. Lasley and Dr. Morrison work full time on the Mercy campus.

  • Medical Physicists – Perform quality assurance on treatment plans and equipment.
  • Radiation Therapists – Provide the radiation treatments to the patients.
  • Dosimetrists – Perform the treatment planning for radiation treatments.
  • Radiation Oncology Nurses – Care for the patients while under treatment and for follow-up visits.
  • Scheduler – Schedules all clinic appointments for patients and works with medical staff.
  • Benefit Counselor – Supports patients in understanding insurance and explains benefits to the patients.
  • Gamma Knife Patient Care Coordinator – Coordinates the whole treatment process and patient care. They also organize the radiosurgery conference which is a multidisciplinary conference with neurosurgery and other specialties..

Our Providers

Astrid Elizabeth Morrison, MD, Mercy
Radiation Oncology
Mercy Clinic
David John Olek Jr, MD, Mercy
Radiation Oncology
Mercy Clinic
David Allen Schomas, MD, Mercy
Radiation Oncology
Mercy Clinic