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Frequency of Portal Images Required to Enhance Quality Assurance for Breast Cancer Patients Treated With Radiotherapy

This study has been withdrawn prior to enrollment.
Cross Cancer Institute
Information provided by (Responsible Party):
AHS Cancer Control Alberta Identifier:
First received: July 22, 2005
Last updated: February 23, 2016
Last verified: December 2011

Currently in Canada, and at the Cross Cancer Institute, the treatment of many women with breast cancer involves radiotherapy (RT). There is a complex process which takes place in order to plan the radiation therapy before patients commence their treatment. In many circumstances the investigators use computerized technology to assist in planning their treatment. This allows more precision in delivering the treatment to the desired areas and avoiding areas of normal tissue.

Once the planning process is completed, the investigators then place marks with a marker pen on the skin of the patient to outline the area where the radiation will be delivered. The investigators confirm that the correct area is being treated with an x-ray taken on the treatment unit while the patient is in the treatment position. This is called a port film or verification film. The investigators then compare this to what they set up with the computerized data. If all the information matches, the patient is then treated for the full course of radiation, with the assumption that all treatments are given in the correct position. No further routine checking is done.

The standard at some radiotherapy centers is that the patient treatment position is verified weekly by a portal film. At the Cross Cancer Institute the investigators normally only do it once at the beginning of treatment.

No information is available to confirm the necessity of doing more frequent verification films, but in view of the very complex nature of the investigators' treatment delivery, it may be necessary to confirm the accuracy of their treatment more often.

Over the course of a 4-5 week treatment the investigators know that some patients may lose weight, some become more relaxed after a few days, and some have trouble with the movement in their shoulders; all of these factors influence the positioning of the patient. Measurements taken on the treatment unit often change during the course of a patient's treatment, but no further verification is performed to ensure that the treated area is still what was initially intended. It is important from a quality assurance standpoint to see if more frequent checking of the radiation treatment set-up is indicated.

Breast Cancer

Study Type: Observational
Official Title: Frequency of Portal Images Required to Enhance Quality Assurance for Breast Cancer Patients Treated With Radiotherapy

Resource links provided by NLM:

Further study details as provided by AHS Cancer Control Alberta:

Enrollment: 0
Study Start Date: March 2004
Estimated Study Completion Date: July 2006
  Show Detailed Description


Ages Eligible for Study:   18 Years and older   (Adult, Senior)
Sexes Eligible for Study:   All
Accepts Healthy Volunteers:   No
Sampling Method:   Non-Probability Sample
Study Population
primary care clinic
  Contacts and Locations
Choosing to participate in a study is an important personal decision. Talk with your doctor and family members or friends about deciding to join a study. To learn more about this study, you or your doctor may contact the study research staff using the Contacts provided below. For general information, see Learn About Clinical Studies.

Please refer to this study by its identifier: NCT00123812

Sponsors and Collaborators
AHS Cancer Control Alberta
Cross Cancer Institute
Principal Investigator: Susan Chafe, MD Cross Cancer Institute
  More Information

Responsible Party: AHS Cancer Control Alberta Identifier: NCT00123812     History of Changes
Other Study ID Numbers: BR-01-0056
Study First Received: July 22, 2005
Last Updated: February 23, 2016

Keywords provided by AHS Cancer Control Alberta:
quality assurance
frequency of port films

Additional relevant MeSH terms:
Breast Neoplasms
Neoplasms by Site
Breast Diseases
Skin Diseases processed this record on September 21, 2017