High kvp technique

High kvp technique

It is a technique in which x ray image of a part of  subject with the application  of high kilovoltage(>kvp). With the use of high kvp range of scattered radiation increases so an effective grid of higher grid ratio is required,alternatively the air gap technique can be used with proper collimation.

Advantages:

Ø  Wide range of tissues can be visualized in one flim (main advantage)

Ø  Reduction in mAs aloows shorter time leading reduction in motion blur

Ø  Heating of x ray tube is reduced

Ø  There is greater exposure latitude

Ø  Radiation dose to patient is reduced

Ø  Allows more frequent use of fine focus

Disadvantages:

Ø  Special equipment is required

Ø  Grid with high grid ratio is required

Ø  Poor  detail and poor  contrast of the soft tissue

Ø   In some cases gonad dose increases like in chest radiography

Ø  There is risk of over penetration

Ø  Bone detail in skeletal work is poorly rendered

Uses:

Ø  In obstetric radiography,reduces  mother and feotus radiation dose

Ø  In HSG,reduces gonad dose

Ø  In Barium series and rapid serial examinations,less heating of tube due to shorter exposure time

Ø  In lateral view of lumbosacral spine

Prepared by :

Sarose Bhandari