Radiology is the medical specialty directing medical imaging technologies to diagnose and treat diseases. The modern day radiological imaging is no longer limited to the use of x-rays and emcompasses specialties and sub-specialties including: Magnetic Resonance Imaging (MRI), Computed Tomography (CT), Mammography, Flouroscopy, Dexa (bone density), Nuclear Medicine, Ultrasound, Positron Emission Tomography (PET), Interventional Radiography and other technologies.