Dreiling Schmidt Radiation Therapy

The Radiation Oncology team at HaysMed is led by Radiation Oncologist Dr. Lyle Harrison. The radiation oncology department also utilizes the services of a medical physicist, certified medical dosimetrists, registered radiation therapists, an oncology certified nurse, and support staff including a full-time licensed social worker.

Radiation Oncology

Radiation oncology is localized therapy used in the treatment of many types of cancer; treatments use high-energy radiation to destroy rapidly dividing cancer cells. Patients at the Dreiling/Schmidt Cancer Institute are offered a full range of radiation services, including external beam radiation therapy.

Our radiation oncologist works in conjunction with medical oncologists and/or surgeons to develop the best, comprehensive cancer treatment plan for each patient. In addition to our staff of highly skilled radiation therapists, nurses, medical physicists, and dosimetrists, are always available to answer any questions that patients, or their families, may have regarding treatment.

Image Guided Radiation Therapy

Using IGRT, the radiation oncology team has the ability to perform CT scans or high quality x-rays directly on the treatment table, in order to identify how organs or patient positions may move from day to day.

Even the most minor positional changes, caused by things such as intestinal gas, bladder filling, or everyday minor positional changes can be identified through IGRT. By pinpointing the exact location of the tumor or affected organ, the radiation plan can be precisely targeted, resulting in more accurate treatment with lower radiation doses to the normal surrounding tissues.

Stereotactic Body Radiation Therapy (SBRT)

SBRT is a technique used to deliver very high doses of radiation to small areas. This technique is predominantly used to treat early stage, small lung cancers without involvement of lymph nodes. SBRT treatment can be utilized in liver, brain, spinal masses and brain metastasis. Results for this technique are excellent. Patients who qualify are given 3-5 treatments, and treatment time takes less than 30 minutes. This technique is used in patients who are not surgical candidates.


Vision RT is an advanced 3D mapping system that tracks the patient’s position and movement during treatment. This precise localization of the treatment area provide precise radiation treatments that spare more normal tissue while delivering more cancer-killing radiation than would otherwise be possible.

Hypofractionated Whole Breast and Prostate Cancer Radiation Treatment

The Dreiling/Schmidt Cancer Institute offers the latest way to treat breast and prostate cancer for its patients who qualify: hypofractionated radiation. This treatment reduces the number of treatments to ½ of the standard treatment

This treatment involves 3-4 weeks of radiation rather than the traditional 6-9 weeks of radiation. This treatment is proven to be just as effective – with less side effects – than the standard six weeks of radiation.

Radiation Therapy Doctors

Lyle M. Harrison, MD

Lyle M. Harrison, MD

Radiation Oncology, radiation-therapy