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مقالات فارسیISIکنفرانسهاژورنالها

Optimization of Head CT Protocol to Reduce the Absorbed Dose in Eye Lenses and Thyroid: A Phantom Study

محل انتشار: مجله فیزیک پزشکی ایران، دوره: 16، شماره: 1
سال انتشار: 1398
نوع سند: مقاله ژورنالی
زبان: انگلیسی
مشاهده: 61

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لینک ثابت به این مقاله:
https://civilica.com/doc/1738817

شناسه ملی سند علمی:

JR_IJMP-16-1_010

تاریخ نمایه سازی: 5 شهریور 1402

چکیده مقاله:

Introduction: Utilization of computed tomography (CT) scans is increasing annually. This study aimed to reduce the absorbed dose of sensitive organs in the head (eye lenses and thyroid) and to assess changes in resultant images quality in head scans when the radiation dose is decreased. Material and Methods: An anthropomorphic phantom was examined with head protocols in both helical and sectional modes using two ۱۶-slice CT scanners. The entrance surface dose of eye lenses and thyroid was measured with standard protocols and after reducing the mAS and kilo-voltage using thermo-luminescence dosimeters (TLDs). Results: In sectional mode with standard protocol, the highest surface dose was ۲.۳ mSv۱ for eye lens and ۰.۰۲۱ mSv for thyroid in hospital A. Moreover, in helical mode with standard protocol, the highest surface dose was ۰.۹۶۴ and ۰.۰۲ mSv for eye lens and thyroid in hospital B, respectively. Reducing tube current and kilovoltage decreased the dose up to ۳۵% for eye lens and ۴۵% for thyroid in hospital A. By the mentioned reductions a dose decrease of up to ۴۰% was achieved for both eye lens and thyroid in hospital B. There were no considerable differences in image quality between scans with standard protocol and the protocols of reduced parameters. Conclusion: Head CT scans with standard factors conduce to images with the best quality. It may be possible to diminish the absorbed dose up to ۴۰% without losing information, especially in follow up head scans.

کلیدواژه ها:

Computed Tomography (CT) ، Eye Lens ، Thyroid

نویسندگان

Parva Kalhor

Tehran University of medical Sciences school of Allied medical Sciences, Tehran province, Tehran, Keshavarz Blvd., Ghods Street, District ۶, Farre danesh

Vahid Changizi

Tehran University of Medical Sciences school of Allied Medical Sciences, Iran, Tehran Province, Tehran, Keshavarz BLVD., Ghods Street, District ۶, Farre danesh

Seyed Abolfazl Hosseini

Sharif University of Technology Department of Energy Engineering, Iran, Tehran province, Tehran, Azadi Street

Elahe Jazayeri

Tehran University of Medical Sciences school of Allied Medical Sciences, Iran, Tehran Province, Tehran, Keshavarz BLVD., Ghods Street, District ۶, Farre danesh

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