* Non - Invasive 
       * Ultrasonography 
       * Magnetic Resonance Imaging 
          * Functional Magnetic Resonance Imaging
       * Computed Tomography Scan 
       * Electrocardiogram 
       * 2D echo 
       * X ray 

  * EXTERNALLY
  * MRI scan
  * T2 weighted MRI scan
  * dark CSF
  * T1 weighted MRI
  * Bright CSF
  * contrast agents
  * barium
  * iodine
  * gadolinium
  * X RAY
  * angiography
  * hysterosalpingography
  * voiding cystourethrogram
  * CT scan
  * contrast enhanced
  * non contrast CT scan
  * sound waves
  * ultrasonography
  * 2d echocardiography
  * doppler
  * arterial doppler
  * venous doppler
  * Positron emission Tomography
  * INTERNALLY

  * Ventilator