Diagnostic:
they are experts in images such as MRI, pet scans, cat scans
Radiation: 
They concentrate radiation on cancer cells to destroy them but leave the healthy ones alive
Physio therapist:
Treats illness and muscle problems, they help damage nerves and muscles recover
Speech therapist:
They help those who have trouble communicated or they help does who can communicate such as acoustics, Down syndrome, etc
Occupational therapist:
They help disabled individuals do simple everyday tasks such as changing clothes or walking
Dietion:
They help people stay healthy in order to prevent disease