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Background: CT scan was first introduced into clinical
practice in 1972, and since then has
grown into one of the predominant diagnostic procedures. In
1998, the UK National
Radiological Protection
Board reported that 20%
of the national collective dose from medical X-ray
examinations derived from CT-scans, although it
represented only 2% of all X-
ray examinations the aim of this study was to determine the X-ray
dosage received by patients in brain CT
scan.
Methods: In this work, we have estimated patient dose arising from CT
examination of brain in five hospitals in Tehran.
Organ and effective doses were estimated for 150
patients who underwent CT examination of
brain. "ImPACT"
version 0.99v was used to estimate
organ and effective dose. Brain examinations
were performed with fixed Kvp, mAs
and T (slice thickness) for each scanner.
Results: Patients, who were scanned by CT
of emam Khomeini center (Toshiba
Xvision /EX
Scanner), received maximum organ dose (brain) and minimum organ dose was
delivered to patients who were scanned by CT
of amir alam center (Toshiba Xvision
/EX Scanner). Maximum effective dose was 1.7
mSv acquired in this study for emam Khomeini
haspital, smaller than the corresponding value obtained by National Radiation
Protection British
(NRPB).
Conclusions: In
two research centers with a system, the obtained results of measurement of
effective dose and organ dose show utilization method of system and its measure
of Kvp & mAs
is very important factor in comparison with type of system. Because
there are both minimum dose and maximum dose in two different centers.
