Patient positioner

A patient positioner, comprising:

• a thoracic support assembly having one or more thoracic attachment members for securing the thoracic support member to a rail, the thoracic support assembly having a thoracic adjustment mechanism configured to shift the thoracic support assembly relative to the one or more thoracic attachment members;
• a lumbar support assembly disposed adjacent to the thoracic support assembly, the lumbar support assembly including one or more lumbar attachment members for securing the lumbar support assembly to the rail;
• wherein the lumbar support assembly includes a lumbar adjustment mechanism configured to shift the lumbar support assembly relative to the one or more lumbar attachment members;
• and
• a bolster coupled to at least one of the thoracic support assembly and the lumbar support assembly, the bolster including a ratchet mechanism for adjusting the position of the bolster relative to the at least one of the thoracic support assembly and the lumbar support assembly.