Low Dose Lung Radiotherapy to Treat COVID-19 Pneumonia

"External Beam irradiation, single fraction of 0.5Gy, to be delivered within 48 hours of enrolment to study. With field to cover as close to lung edges as AP/PA technique allows.~A further 0.5GY to the thorax given up to 96 hours apart from first fraction is permitted, if a patient had either (a) responded to the first dose but then deteriorated, however remaining better than baseline level or (b) stabilized after first dose but not fully improved."