Radiation Therapy Quality and Safety

A rigorous program of continuous equipment testing, treatment monitoring, and independent review ensures the safety of our patients. Our department is accredited by the American College of Radiology (ACR), which provides a third-party, impartial peer review and evaluation of patient care. Before granting accreditation, the ACR assesses quality and safety of patient care, documentation of policies and procedures, equipment maintenance, and treatment planning records.

Radiation oncologists, technicians, physicists, and equipment specialists perform safety checks at every step of the treatment process — from the day radiotherapy machines are installed to the planning and delivery of each treatment.

These checks ensure radiation therapy treatments are appropriate and customized for each patient. They provide an opportunity to review every patient's treatment plan and make modifications as necessary. Plus, they create an environment where safety — and its improvement — is an intrinsic part of treatment.

Catching and Preventing Errors

The linear accelerator (LINAC) machine that delivers radiation therapy to patients has redundancy systems to control and monitor radiation doses and direction. These systems shut off the LINAC if it is not performing to specifications.

All LINACs undergo an extensive set of quality assurance measurements to ensure the radiation therapy is delivered correctly and the system for planning radiotherapy treatments is fully in sync with each LINAC. This is followed by a schedule of daily, monthly, and annual tests to monitor LINAC performance. There is also a system of independent checks is in place to verify that the calculations used to program the LINAC and position of each patient is correct.

All new treatment plans are examined by clinical faculty at meetings known as chart rounds. During these meetings, physicians, treatment planners, physicists and radiation therapists perform peer reviews of treatment plans and patient charts. Additional quality checks are performed prior to the initiation of any treatment course.

All patients on treatment are monitored by physicians at regular intervals over the course of their therapy.

The accuracy of radiation is regularly verified prior to treatment with advanced images that are reviewed by attending physicians.

A non-punitive safety reporting system encourages any member of the department to report errors or near misses. All such reports are reviewed by the multidisciplinary Quality Improvement Committee. This committee suggests improvements in department processes and communicates with hospital safety committees as well as the Massachusetts Department of Public Health's Radiation Control Program.

Standard Safety Checks

Staff conduct the following safety checks at every phase of machinery operation and treatment planning and delivery.

Linear Accelerator Safety

  • Before a LINAC is placed in service, an extensive set of acceptance and commissioning measurements ensures the machine is working properly and complies fully with the treatment modeling system.
  • These measurements are verified by an independent assessment by the Radiological Physics Center, which provides auditing services to radiation oncology departments across the country.
  • Every morning, staff perform safety checks of the machinery's dose calibrations and body-positioning features. More detailed checks of mechanical and imaging equipment are conducted monthly, and comprehensive testing is performed annually.

Treatment Planning

  • Radiation therapy physicists and senior therapists conduct independent reviews of all patients' treatment plans. Intensity-modulated radiation therapy (IMRT) plans are first delivered on a test basis to a plastic model to ensure the LINAC will deliver the planned treatment accurately.

Treatment Delivery

  • Settings for the dose and shape of the radiation beam are automatically transferred from the treatment planning system to the LINAC to avoid transcription errors or miscommunications.
  • A Record and Verify system ensures the LINAC is programmed as planned and logs the delivery of treatment. The Record and Verify system will not allow the LINAC to treat a patient if it is programmed differently than the treatment plan.
  • Video monitors enable staff to view radiotherapy treatments in progress. An automated bar-coding system ensures proper patient identification, both as the patient enters the department and as treatment information is displayed on the LINAC.
  • A mandatory safety pause (“time-out”) is performed prior to each treatment.

High-Level Review of Proposed New Treatments

  • Approval from the New Technology Committee, which includes senior representatives from each section of the department, is required for all proposed new treatments. The committee reviews policies, procedures, and the safety record for proposed new treatments and recommends needed resources.

Chart Checks

  • Patient medical charts receive an initial review by a Quality Chart Therapist. During chart or new patient rounds, all patient charts and treatment plans are peer-reviewed by all Radiation Therapy faculty and staff, as well as representatives from every section of the department.
  • Separate chart reviews are conducted on all brachytherapy cases, in which radioactive "seeds" are placed in cancerous tissue. Radiotherapy physicists check patient charts weekly and after the conclusion of treatment. Physicians assess patients throughout their treatment and review verification films that confirm patient set-up at least weekly.

Quality Assurance

We maintain a quality assurance system for reporting adverse events and near misses that meets and exceeds national standards. All such events are reviewed by the department’s Quality Improvement Committee and are reported to the hospital safety committees and state regulators when appropriate. Such incidents may trigger a Root Cause Analysis, in which specialists investigate the causes of the problem and formulate plans to prevent it in the future. Our safety record is well documented and very good, but we constantly strive to improve.

Reporting to the Commonwealth of Massachusetts

The Department of Public Health’s Radiation Control Program requires reporting of mistreatments that meet a variety of criteria. These include treating the incorrect patient, the incorrect site, using the incorrect modality, or treatments that deviate from the specifications of the planned treatment. The criteria for these "misadministrations" are detailed in the program’s regulation CMR 120.435.

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