A radiotherapy technique for thyroid cancer

A treatment technique for treating patients with cancer of the thyroid is presented. This is a modification of “the bar-arc” technique that uses a centrally blocked moving field. We have introduced wedges and partial midline block to achieve uniform dose within the treatment volume. This enables the desired dose to be delivered to the primary, the lymph nodes and the cervical soft tissues at risk, yet keeping the dose to the spinal cord to a minimum in the cervical region and to acceptable levels in the superior mediastinum.