CT

- beam hardening effect generally increases attenuation of CT

- filtered back projecting uses filter with high attenuation

-

 

US

- MI and Thermal index should be listed in machines after 2000

- 0.7 MI threshold for cavitation for microbubbles

 

Improved deep view image on US by

- decrease freq (T)

- decrease PRF (T)

- increase power (T)

- increase brightness (F)

- increase gain (?F)

 

 

MRI artefacts

- chemical shift in frequency encoding direction.

- wrap around artefacts

 

Fluorscopy

- CCD camera used