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Scope of Practice

The Scope of Practice is designed to assist the Qualified Medical Dosimetrist in defining his or her roles in the technical services that they provide in patient care. The document also defines the Qualified Medical Dosimetrist, provides a statement of basic responsibility of the Qualified Medical Dosimetrist, and addresses education, certification, continuing education, and maintenance of certification. Included are statements on supervision by and of the Qualified Medical Dosimetrist. This document stresses that it is essential that the Qualified Medical Dosimetrist be an active participant in the collaborative, team approach to patient care and that effective communication with the radiation oncology team is essential for providing quality patient care.

In addition the Scope of Practice is designed to educate professionals in the fields of health care, education, other communities of interest and the general public regarding the expectations of the Qualified Medical Dosimetrist. The document can be used by individual facilities to develop job descriptions and practice parameters.

Click here to download a PDF of the Scope of Practice (Revised October 2012)

Joint Statement of the AAMD and MDCB Regarding Scope of Practice (September 2017)

The Medical Dosimetrist Certification Board (MDCB) 2016 Certified Medical Dosimetrist (CMD) Survey indicated that many medical dosimetrists are being asked to contour clinical target volumes (CTVs) and gross target volumes (GTVs).1 Medical dosimetrists should be aware that requests to determine CTVs and GTVs are outside the scope of practice for medical dosimetrists. Further, the medical dosimetrist who is certified and submits to requests to execute contours of CTVs and GTVs is in violation of MDCB Ethical Standard 12,2 "A CMD shall not practice beyond the scope he or she is competent to perform as defined in" American Association of Medical Dosimetrists' The Scope of Practice of a Medical Dosimetrist.

The literature regarding scope of practice is definitive. Both ASTRO publications, Safety is no Accident3 and the APEX Practice Standards,4 indicate that the role of each member of the Radiation Oncology Practice is delineated by the individual profession's scope of practice. ” Other publications are clear on the specific contouring function. Determining CTVs and GTVs are the responsibility of the radiation oncologist.5

Most health-care professions develop a scope of practice document to define the procedures, actions and processes that a health-care practitioner is permitted to undertake. The scope of practice endeavors to assure proficient performance that reflects ongoing professional training. For those dedicated to the ever more complex radiation oncology field, safe and competent delivery of care is achieved through adherence to the guidelines outlined. Medical dosimetrists must not practice beyond the boundaries outlined in The Scope of Practice of a Medical Dosimetrist.

Finally, members of a radiation oncology team should recognize the obligation to voice concerns regarding patient care and safety without fear of reprimand.6 No matter how small a facility the ultimate concern is delivering safe patient care.7


1 2016 MDCB CMD Survey
2 MDCB Ethical Standards
3 Safety is No Accident – page 11
4 APEX Practice Standards – page 4
5 Safety is No Accident – page 6; ACR-ASTRO Practice Parameter for Radiation Oncology, page 3
6 Safety is No Accident – page 19
7 Safety is No Accident – page 1