Abstract:
Objective: is to apply a technical protocol to reduce CT radiation
Dose in trauma cases by decreasing the mA (tube current).
The target reduction is 50%.
Method:
Performing scanning on an adult phantom for trauma protocol
Brain. Reference scan (default exposure) 300mA to be registered
In exposure log shoot and calculate the dose received in msv.
Scan2 reducing mA to200 and registered the dose, evaluate the
Image quality.scan 3 reducing mA to100 and registered the dose
Received, evaluate the image .phase (2)implemented if phantom
Image quality is of acceptable quality .Performing CT trauma with
The default exposure parameters and register the dose received .
Reference scan can be obtained from previous CT trauma cases.
Performing CT trauma with reduction of mA factor to 200mA and
Registering the dose received image to be evaluated by the tech-
-nologist and radiologist. Performing CT trauma with reduction of
mA factor to 100mA and register the dose received .Image also to
be evaluated by the technologist and radiologist .Applying the rec-
-commendations CT technologists and radiologists on the range of
Accepted quality and delineate the reduction rate.
CT trauma cases with reduced mA can be viewed and the review
The radiologist reports .
Reduction of mA factor in CT parameters will induce reduction in
CT dose to the patient and this can be applied to all cases.
Performed scan for 54 cases 28 cases with tube current 200 mA
And 26 cases with tube current 100 mA .The result was found
Clearly the absorbed dose and the effective dose fall down to the
Half when used 200mA and more less when we used 100mA
as tube current .
