ESTRO 2021 Abstract Book

S536

ESTRO 2021

the cases. The treatment workflow for CR is very comparable to standard SBRT. However, there is an additional need to incorporate electrophysiology and/or scar anatomical imaging for target delineation. The mapping systems used in electrophysiology are not compatible with radiation oncology systems, yet. Some technical solutions have been developed by various researcher and developers worldwide [3,4], but standardization of these processes seems still far away. Furthermore, both respiration-induced and cardiac-induced target motion needs to be carefully assessed and compensated. Respiratory motion management techniques such as the internal target volume (ITV) concept (with and without abdominal compression), gated deliveries (with and without breath hold) and tracking techniques (robotic, gimbaled, collimator, etc.) are well established for SBRT and were also reported for CR [2]. Cardiac motion is of higher frequency and smaller magnitude than respiratory motion and only limited data exists on the requirements and suitability of active motion compensation and its impact on the dose distribution. Direct tracking or gating or dose calculation for cardiac or combined cardio-respiratory motion has been conceptually proposed or utilized in phantom studies [5] but have not yet been used in clinical treatments. In summary, many open questions remain on the detailed mechanisms of focused radiation in the diseased human heart, the minimal dose needed for each of the different clinical case scenarios and the optimal planning and delivery options for CR as well as harmonized reporting standards for target definition and technical/dosimetric treatment parameters. These questions will be addressed in ongoing clinical multi-center trials [6] and in a large EU funded Horizon 2020 project called STOPStorm. Medical physics will play an essential role in addressing these open questions. [2] Lydiard PGDip S, Blanck O, Hugo G, et al. A Review of Cardiac Radioablation (CR) for Arrhythmias: Procedures, Technology, and Future Opportunities. Int J Radiat Oncol Biol Phys. 2021;109(3):783-800. [3] Hohmann S, Henkenberens C, Zormpas C, et al. A novel open-source software-based high-precision workflow for target definition in cardiac radioablation. J Cardiovasc Electrophysiol. 2020;31(10):2689-2695. [4] Brownstein J, Afzal M, Okabe T, et al. Method and atlas to enable targeting for cardiac radioablation employing the American heart association segmented model. Int J Radiat Oncol Biol Phys. 2021;S0360- 3016(21)00313-8. [5] Poon J, Kohli K, Deyell MW, et al. Technical Note: Cardiac synchronized volumetric modulated arc therapy for stereotactic arrhythmia radioablation - Proof of principle. Med Phys. 2020;47(8):3567-3572. [6] Blanck O, Buergy D, Vens M, et al. Radiosurgery for ventricular tachycardia: preclinical and clinical evidence and study design for a German multi-center multi-platform feasibility trial (RAVENTA). Clin Res Cardiol. 2020;109(11):1319-1332. [1] van der Ree MH, Blanck O, Limpens J, et al. Cardiac radioablation-A systematic review. Heart Rhythm. 2020;17(8):1381-1392. Abstract Text Low health literacy is a barrier facing many patients with chronic diseases and low levels of interactive health literacy may impact on effective use of services. Interactive health literacy is defined as “ advanced literacy skills that enable individuals to extract information and derive meaning from different forms of communication; to apply new information to changing circumstances; and to interact with greater confidence with information providers such as health care professionals .”(Don Nutbeam, 2000). Interactive health literacy: the possession of literacy skills required to extract, understand and discriminate between health information from different sources, and to apply new information to changing circumstances. This reflects the outcome to health education focused on the development of personal skills and improved personal capacity to act independently on knowledge, and designed to improve motivation and self-confidence to act on information obtained. Interactive health literacy skills enables a higher level of interaction with different sources of information, including clinicians providing advice. This session will focus on the health literacy and how this might empower the patient in managing their care in Oncology. The following areas will be explored within the context of health literacy: 1) Self management Self management of care and treatment is one of the most importance factors amongst cancer patients. There is some evidence that this increase in self-management leads to a reduction in unnecessary use of health services. Health literary helps patients to better manage their care due to their increased knowledge and better understanding of their symptoms. Self-care advice and specific information about their treatment also increases self-management. 2) Patient Empowerment Participants in several studies identified feeling high levels of responsibility for their own care and it was identified as a facilitating factor for the increased participation in the treatment of their condition. The access to cancer information enables patients to feel more in control. Developing literacy in their own condition and an increased responsibility for their care through the management of their symptoms increased levels of empowerment. 3. Patient communication. Effective communication is a key component of interactive health literacy and interventions aimed at improving patient-doctor communication positively correlate with improved health. Health literacy improves Teaching lecture: Health literacy: The cornerstone of the patient's understanding of radiotherapy SP-0669 Health literacy: The cornerstone of the patient's understanding of radiotherapy A. Stewart-Lord 1 1 London South Bank University, Institute of Health and Social Care, London, United Kingdom