Nanotechnology

PET

• Very expensive $2 million
• Radio tracers have a half-life of only 75seconds; also more expensive than SPECT radio tracers. Limited imaging time.
  

SPECT

• Long scanning times
• Low resolution images
• Images could be blurred when imaging larger patients

Ultrasound

• Resolution of images is limited
• Ultrasound is reflected very strongly on passing from tissue to gas, or vice versa. This means that ultrasound cannot be used for examinations of areas of the body containing gas, such as the lungs and the digestive system.
• Ultrasound also does not pass well through bone, so that the method is of limited use in diagnosing fractures.
• The interpretation of ultrasound images, especially for complicated procedures, requires highly skilled specialists.

PET scannner  

These machines are usually very expensive. The PET scanner above costs around 2million.