| چکیده انگلیسی مقاله |
Background: Computed tomography (CT) of the brain is associated with radiation exposure to the lens of the eyes. Therefore, it is necessary to optimize scan settings to keep radiation exposure as low as reasonably achievable without compromising diagnostic image information. The aim of this study was to compare the effectiveness of the five practical techniques for lowering eye radiation exposure and their effects on diagnostic image quality in pediatric brain CT. Methods: The following scan protocols were performed: reference scan, 0.06?mm Pbeq bismuth shield, 30% globally lowering tube current (GLTC), reducing tube voltage (RTV) from 120 to 90 kVp, gantry tilting, and combination of gantry tilting with bismuth shielding. Radiation measurements were performed using thermoluminescence dosimeters. Objective and subjective image quality was evaluated. Results: All strategies significantly reduced eye dose, and increased the posterior fossa artifact index and the temporal lobe artifact index, relative to the reference scan. GLTC and RTV increased image noise, leading to a decrease signal?to?noise ratio and contrast?to?noise ratio. Except for bismuth shielding, subjective image quality was relatively the same as the reference scan. Conclusions: Gantry tilting may be the most effective method for reducing eye radiation exposure in pediatric brain CT. When the scanner does not support gantry tilting, GLTC might be an alternative |
| نویسندگان مقاله |
| Vahid Karami
Department of Biomedical
Engineering, Dezful Branch,
Islamic Azad University,
Dezful, Iran
| Mohsen Albosof
Department of
Medical Physics, Lorestan
University of Medical
Sciences, Khorramabad, Iran
| Mehrdad Gholami
Department of Biomedical
Engineering, Dezful Branch,
Islamic Azad University,
Dezful, Iran
| Mohammad Adeli
Department of Radiology,
Isfahan University of Medical
Sciences, Isfahan, Iran
| Ali Hekmatnia
Vahid Karami,
Clinical Research Development
Unit, Ganjavian Hospital,
Dezful University of Medical
Sciences, Dezful, Iran.
| Mehdi Fallah
Clinical Research Development
Unit, Ganjavian Hospital,
Dezful University of Medical
Sciences, Dezful, Iran
| Bagher Sheidaei
Department of Biomedical
Engineering, Dezful Branch,
Islamic Azad University,
Dezful, Iran
| Ali Taghizadeh Behbahani
Clinical Research Development
Unit, Ganjavian Hospital,
Dezful University of Medical
Sciences, Dezful, Iran
| Hoda Sadat Sharif
Clinical Research Development
Unit, Ganjavian Hospital,
Dezful University of Medical
Sciences, Dezful, Iran,
| Somayeh Jafrasteh
|