Assessment of Effective Dose Associated with Coronary Computed Tomography Angiography in Isfahan Province, Iran

Mohammadbagher Tavakoli, Reihane Faraji, Zahra Alirezeai, Zohre Nateghian


Computed tomography coronary angiography (CTCA) has generated a great interest over the
past two decades, due to its high diagnostic accuracy and effcacy in the assessment of patients
having coronary artery disease. This method is associated with high radiation dose and this has
raised serious concerns in the literature. Effective dose (E) is a single parameter meant to reflect
the relative risk from exposure to ionizing radiation. Therefore, it is necessary to calculate this
parameter to indicate ionizing radiation relative risk. The aim of this study was to calculate the
effective dose from 64‑slice CTCA in Isfahan. To calculate the effective dose, an ionization
chamber and a body phantom with diameter of 32 cm and length of 15 cm were used. CTCA
radiation conditions commonly used in two centers were applied for this work. For all scans,
computed tomography volume dose index (CTDIv), dose‑length product (DLP), and effective dose
were obtained using dose‑length‑product method. The obtained CTDIv, DLP, and effective dose
were compared in two centers, and mean, maximum, and minimum values of effective dose for
heart coronary CT angiography (CCTA) examinations and calcium score were compared with
other studies. The amount of average, maximum, and minimum effective doses for heart CCTA
examinations in two centers are 4.65 ± 0.06, 6.0489, and 3.492 mSv, respectively, and for calcium
score test are, 1.04 ± 0.04, 2.155, and 0.98 mSv, respectively. CTDIv, DLP, and effective dose
values did not show any signifcant difference in two centers. Although the effective dose of CTCA
and calcium score was lower than that of other studies, it is reasonable to reduce the effective dose
to the minimum possible value to reduce the risk of cancer associated with ionizing radiation. The
results of this study can be used to introduce the effective dose as a local diagnostic reference
dose (DRL) for CTCA examinations in Isfahan Province.

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