What is the difference between radiation therapy and radiation oncology?

It is the same. Years ago they called the doctors radiation therapist, then they changed that to radiation oncologist and the therapist was for the technician who delivers the treatment. The names are for use of radiation medically to treat disorders. Mostly cancer but other disorders as well.
Radiation therapy. Our specialty used to be called radiation therapy, but is now called radiation oncology. The actual procedure is called radiation therapy and is given by licensed non-md radiation therapists, under the supervision of a radiation oncologist (md).
Somantics. Radiation oncology is the name of the discipline that studies the use of "radiation therapy" in the treatment of cancer and other benign diseases.
Tech vs. doctor. Radiation therapist is a certified technician that can help set up patients daily for accurate delivery of radiation prescribed by the radiation oncologist. Radiation oncologist is a board certified doctor (md or do) that specializes in treating cancer patients using radiation.

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Need advice on what is the the difference between radiation oncology and radiation therapy?

Treatment. Therapy = treatment provided to a patient oncology is a branch of medicine. Read more...
Radiation Medicine. Radiation therapy (xrt), is the term for medical use of ionizing radiation radiation oncology is the science for the use of radiation for cancer treatment to control or kill malignant cells. Therapeutic radiology is the more encompassing term that describes the use of radiation for therapeutic purposes both benign and cancer treatment. All 3 terms are often used interchangeably. Read more...
Oncology. Is a specialty studying tumors and their treatment, 'therapy' invokes the concept that the radiation may be used to treat tumors, but also other thing, like keloids, for a while, coronary stents, wet macular degeneration, and some of us use isotopes like i-131 to treat hyperthryroidism. Read more...

Is there a difference between radiation oncology and radiation therapy?

Terminology. Radiation therapy is the delivery of radiation to treat an illness (usually malignant) radiation oncology is the study and science associated with the delivery of that therapy. Read more...
Semantic. Subtleties...Oncology means study of tumor, and radiation oncology is the role of radiotherapy in the treatment of tumors. Therapy is 'treatment: focused" as opposed to modality focused. Since radiotherapy can be used in things other than cancer or tumor, some object to the oncology term. Others dislike therapy because it sounds so utterly unscientific. Read more...
No other than the dz. Radiation or x-ray therapy is used mostly to treat cancer or malignancies which is referred to as oncology. Throughout the history of radiation therapy a number of benign or noncancerous diseases have been treated with radiation. Most use the terms interchangeably. Today we use radiation therapy to tx benign conditions such as keloids, heterotropic ossification, plantar fasciitis, &some B9 tumors. Read more...