ESTRO 37 Abstract book

ESTRO 37

S616

treatment and likewise at follow-up. In addition, hours of immobility at home during the day increased from a mean of 3.8 hours/day at baseline to 4.8 hours/day at follow-up which corresponded to an observed decrease in the patient-reported weekly hours of work, exercise and physical activity after radiotherapy. At the end of follow-up, the patients reported on average 63 more minutes of sleep a day compared with pre- treatment. However, there was no significant association between weight loss and the changes in daily hours of sleep ( p=1.000 ) or immobility ( p=0.238 ), nor with physical exercise ( p=1.000 ). Pre-treatment 33% of the patients reported not working which increased to 54% at the final follow-up. Being off work at the end of treatment was more prominent in the group with weight loss >5%, though not statistically significant ( p=0.862 ). Conclusion No association could be discerned between weight loss and patient-reported physical activity or changes in daily hours of sleep. The majority of patients had a weight loss above 5% after radiotherapy for H&N and reported increased hours of sleep and immobility from pre- treatment to the end of follow-up. PO-1093 Personalized painted masks may help to make pediatric radiation treatment more tolerable J.J. Van Dongen 1 , C.J. Haasbeek 1 , B.J. Slotman 1 , I.T. Kuijper 1 1 VU University Medical Center, Radiation Oncology, Amsterdam, The Netherlands Purpose or Objective An immobilization mask covering the head is often necessary to increase the accuracy and reproducibility of radiation treatment. For some children, this may be especially stressful or frightening. Inspired by colleagues from another department and previous reports that painting masks may reduce anxiety, we introduced them in 2016. The pediatric radiotherapy team includes a radiation therapist (RTT) who is also an artist. She created unique masks based on the child’s own favorite person, animal or character - for example, a movie character, their own pet or pop idol. (figure) We describe the workflow and RTT experience with these masks.

favorite cuddly toy and/or playing music during treatment. 2. At the 1 st fraction the painted mask is shown to the child and parents. 3. After the last fraction the child takes the mask home. Physics review concluded that the layer of paint (PartyXplosion ® ) water-based nontoxic for the skin) used on the mask is very thin (tenths of a mm) and consists of low Z material, so the influence on dose was expected to be negligible. A questionnaire was distributed to 6 RTTs from the pediatric team to capture their experiences. Results The RTTs experiences suggest that the painted mask was a positive influence, especially at the first fraction. The children recognize the character and seem more relaxed, they appear interested in the mask, less frightened by it and may even be enthusiastic and happy. They seem less focused on and worried about the treatment itself, and having their own unique mask seems to make them feel special. For friends and relatives that come into the treatment room the painted masks are less frightening to see. Also, the possibility to talk about a more cheerful subject, like the mask, was seen as positive. Overall, the workload stayed the same as before (except for the painting of the mask). There was little downside: two RTTs mentioned that the paint stained her hands and one mentioned that infra-red markers were a bit harder to apply. Conclusion Based on our initial experience, RTTs thought that unique painted immobilization masks made children more relaxed. These are now standard in our institute. Evaluation from a child/parent perspective would be of interest and there might be other patient groups which painted masks could help, like claustrophobic or scared patients. PO-1094 Dosimetric parameters and toxicity in Sterotactic Radiotherapy (SBRT) for Thoracic Tumors. J. Monroy Anton 1 , C. Dalmau Roig 1 , A. Caño Gomez 2 , M. Estors Guerrero 3 , M. Albert Antequera 1 , A. Soler Rodriguez 1 , M. Lopez Muñoz 1 , A. Navarro Bergada 1 , M. Soler Tortosa 1 1 hospital Universitario De La Ribera, Radiation Oncology, Alzira, Spain 2 hospital Universitario De La Ribera, Radiology, Alzira, Spain 3 HOSPITAL UNIVERSITARIO DE LA RIBERA, THORACIC SURGERY, ALZIRA, Spain Purpose or Objective The Planning Target Volume (PTV) and the mean dose (MD) received by the healthy lung in the stereotactic treatment (SBRT) of thoracic tumors may be factors to be taken into account to evaluate the development of toxicity of these treatments. Objective: To assess the degree of toxicity as a function of the PTV designed and mean dose in SBRT treatments. Material and Methods Population: 53 cases of thoracic lesions (primary/metastases) treated with SBRT (CLINAC 2100-C); simulation and planification: 4D-CT (Phillips Big Bore, Pinnacle System). GTV designed with the image set of the 4D-CT reconstruction. PTV designed with a margin of 5mm from GTV. Analyzedparameters: -PTVvolume. - Mean Dose to healthy (contralateral) lung. -Toxicity scale: RTOG (Radiation Therapy Oncology Group).

Material and Methods Five cranial immobilization masks (four Brainlab and one Civco Medical Solutions), have been painted based on pictures chosen by the child and parent(s). All patients were girls, age 5-31 (two older patients had a mental age of ± 10 years). Treatment indications were arteriovenous malformation (AVM, n=2), meningioma (n=2) and pons glioma (n=1). Process: 1. After making the mask in the mould room, the child and parents are asked how it can be transformed into a special ‘happy mask’, and if there are other ways to make the mask and the experience more comfortable, e.g. cutting out eyes/nose/mouth, where possible to maintain stability, or holding their