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Re-treatment of a lung tumour using a simple intensity-modulated radiotherapy approach

¹ Department of Medical Physics, Hull and East Yorkshire NHS Trust and Clinical Biosciences Institute, University of Hull, Princess Royal Hospital, Saltshouse Road, Kingston Upon Hull HU8 9HE and ² Department of Clinical Oncology, Princess Royal Hospital, Saltshouse Road, Kingston Upon Hull HU8 9HE, UK

View larger version (66K): [in a new window]   Figure 1. The rectangular outlines in each beam's eye view denotes the field defining collimators. We use a gantry angle convention where a 0 degree beam direction defines an anterior field for a supine patient and angles increase in a clockwise direction about the patients left side. We note that each beam is forced to conformally avoid the (rendered) cord. The non-uniform outline denotes the maximum irradiated area under each of the intensity modulated beams.

View larger version (55K): [in a new window]   Figure 2. Dose–volume histogram showing the dose–volume profiles for the planning target volume (PTV) and organs at risk for plans: (1) the intensity-modulated radiotherapy (IMRT) solution chosen and (2) the best conventional option regarding dose to the cord.

View larger version (94K): [in a new window]   Figure 3. Shows the 95% dose cloud covering the planning target volume (PTV).

View larger version (79K): [in a new window]   Figure 4. Digitally captured images from the simulator. The upper row were anterior–posterior (AP) images and the lower row lateral (LAT) images. The left column were obtained under normal respiration. The centre column on breath-hold at deep inhalation and the right column similarly at deep expiration.