[Feasibility study: The medical imaging as a tool for therapeutic education in radiotherapy]

Assess the feasibility of a randomized controlled trial (RCT) exploring the use of medical imaging as a therapeutic education (TPE) intervention in external radiation therapy.

Experimental feasibility trial of "RCT" type carried out in a single-center, between November 2019 and March 2020, following adult patients treated by thoracic radiotherapy. In addition to the information usually given, the experimental group benefited from an intervention consisting in the visualization of their own medical images using the open-source software "Stone of Orthanc".

Forty-nine patients were recruited with a refusal rate of 8.16% (4/49). 20 patients were withdrawn from the study for health reasons (COVID), 10 for medical reasons. All the remaining 15 participants completed the process. Although not significant, the experimental group showed a median gain in the perception of knowledge compared to the control group (+ 1.9 (1.6 - 2.2)) vs (+ 1.4 (1.4 - 1.8)), as well as a decrease in scores related to anxiety (- 3.0 (-4.5 - (-2.0)) vs - 1.0 (-5.0 - 0.0)) and emotional distress ((- 5.0 (- 7.5 - (- 3.5)) vs (- 2.0 (- 5.0 - (- 1.0)) A significant reduction (p=0.043) is observed for the depression score ((- 2.0 (-3.0 - (-1.5)) vs (0.0 (0.0 - 0.0)).

This study demonstrates the feasibility of the project, with promising preliminary results. Some adaptations in order to conduct a larger-scale RCT are highlighted.