SRINAGARIND MEDICAL JOURNALVolume 35, No. 02, Month MARCH, Year 2020, Pages 153 - 160
The measurement radiation doses to the lens of eye and thyroid gland from computed tomography brain scans and radiation dose around in ct scan room phantom study
Jiranthanin Phaorod, Wattana Wongsanon, Petcharakorn Hanpanich, Pattaraporn Dornsrichan
Abstract Download PDFBackground and Objective: This study aimed to
measure radiation dose to lens of eye and thyroid
gland from three different computed tomography (CT)
brain scanners, including of measuring the radiation
dose with and without bismuth radiation shield.
Moreover, the scatter radiation dose in the CT rooms
was also measured.
Methods: Optically stimulated luminescence (OSL)
dosimeters were placed on the phantom to measure
the skin dose at eye lens and thyroid gland. The OSL
dosimeters were also placed on the wall, door, lead
glass inside and outside the CT rooms to measure the
radiation dose in the supervised and controlled area.
Results: The radiation equivalent doses from the three
CT scanners were significantly different. The use of
bismuth eye shield could reduce the amount of radiation
on the eye lens by 27 - 48 %. The radiation
dose in the supervised area was within the relevant
annual dose limit. However, there were two locations in the controlled area where radiation dose exceeded
the dose limit. The investigation must be performed
to reduce the radiation dose within the regulatory
Conclusions: Radiographers should carefully adjust
the exposure techniques in order to optimise the
radiation doses, especially in pediatric patients. The
bismuth radiation shield helps to reduce the scattered
radiation. The efficiency of lead door, wall and lead
glass must be routinely checked for radiation monitoring.
CT scan, OSL dosimeter, radiation dose, controlled area, supervised area