Troalen is currently director of finance at The Shrewsbury and Telford Hospital NHS Trust (SaTH), a role she has held for four years.
Jo Williams, chief executive for SaTH, said: ‘Helen has led significant improvements in the organisation, securing much-needed investment for our quality, estates and digital transformation programmes.
‘Through Helen's leadership we have stronger foundations in place that will help us to continue our important improvement work to deliver excellent care and value for everyone.'
Troalen said: ‘I am looking forward to starting a new chapter in my own journey, as an interim chief finance officer in Berkshire, but will continue to follow the exciting transformation happening over the coming years for our communities in Shropshire, Telford and Wrekin and Mid Wales'
She will take up her new role in June.