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Treatment of tumours of the parotid gland and middle ear using obliquely reconstructed computed tomographic images

Department of Medical Physics, Weston Park Hospital, Sheffield ^* Department of Radiotherapy and Oncology, Weston Park Hospital, Sheffield

Conventional planning of radiotherapy of tumours of the parotid, middle ear and other tumours in the head and neck often requires the treatment plane to be non-transverse. This produces major problems in delineating the tumour as well as verifying that vital structures such as the spinal cord are not included in the target volume. The use of computed tomography (CT) generally overcomes some of these problems and we have developed an algorithm to reconstruct transverse CT images into the appropriate oblique plane. Software has been written on the Picker Independent Treatment Planning System (ITPS) to allow planning on central axis and off-axis oblique planes. In addition we have used a beam's eye view facility to aid in the verification process.

Received for publication January 1, 1989.