Shalleh, Norzulaili Md
(2004)
Exposure rate in mobile c-arm fluoroscopy and
radioiodine therapy.
Other thesis, Universiti Sains Malaysia.
Abstract
This study is done to measure the exposure rate from mobile c-arm
fluoroscopy and patients undergo radioiodine therapy. The measurement of exposure
rate from mobile c-arm fluoroscopy was carried out using survey meter model 451 B,
and also lead apron with 0.5 mm lead equivalence thickness. The exposure time,
distance, shielding material and value of kVp and mAs were considered.
This study was done by varied the exposure time of mobile c-arm fluoroscopy
while the value of kVp was remaining constant. This was done to see the effect of
exposure time to the exposure rate. From this study, we found that the exposure rate
was increased exponentially with exposure time.
This study also done by varied the distance of survey meter from mobile c-arm
fluoroscopy. This was done to see the effect of distance to the exposure rate. From
this study, we found that the exposure rate decreased for about 30% when the
distance increased by 1 0 em.
Besides that, this study was also done; by covering the survey meter with lead
apron with 0.5 mm lead equivalence thickness. This was done to see the effect of
shielding to the exposure rate. We found that the exposure rate decreased for more
than 90o/o when the lead apron was used.
We also measured the exposure rate from patients undergo radioiodine
therapy. This study was done after the patients had drunk the radioiodine solution for
30 minutes. This study also used survey meter model 451 B to measure the exposure
rate from various distance. From this study, we found that the exposure rate from
radioiodine therapy patients decreased exponentially with increasing distance.
As conclusion, we can say that the exposure rate from mobile c-arm
fluoroscopy and patients undergo radioiodine therapy, can be minimized by
increasing distance, decreasing exposure time, and also by using shielding materials.
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