Dosimetric Evaluation of Multislice CT Using AnthropomorphicHead Phantom

  • Seyedeh Fatemeh Seyedatashi Islamic Azad University, Science and Research Branch, Tehran, Iran.
  • Mitra Athari Islamic Azad University, Science and Research Branch, Tehran, Iran.
  • Ahmad Bitarafan-Rajabi Cardiovascular interventional research center, Department of nuclear medicine, Rajaei Cardiovascular, Medical & Research Center, Iran University of medical sciences, Tehran, Iran.
  • Hadi Hasanzadeh Mail Cancer Research Center and Department of Medical Physics, Faculty of Medicine, Semnan University of Medical Sciences, Semnan, Iran
  • Mehravar Rafati Department of Medical Physics, Faculty of Paramedical Sciences, Kashan University of Medical Science, Kashan, Iran.
  • Hamid Reza Pouraliakbar Rajaei Cardiovascular, Medical & Research Center, Radiology Department, Iran University of Medical sciences, Tehran, Iran.
  • Ali Mohammadzadeh Rajaei Cardiovascular, Medical & Research Center, Radiology Department, Iran University of Medical sciences, Tehran, Iran.
Keywords:
Multidetector computed tomography, Film dosimetry, Phantoms, Imaging

Abstract

Purpose: The most general form to report dose in Multislice CT is the CTDI and DLP which are computed for several slices. The goal of the current study was to estimate actual doses and dose distribution during CT examinations in a head and neck anthropomorphic phantom.
Methods: After construction of the head and neck phantom using natural bone and paraffin wax with NaCl as impurity, several places were considered in different sites to fill with badges of Gafchromic film. These places include brain, Parotid, Thyroid and Lens of eye. Phantom was scanned at CT Angio and Spiral protocols with 10 and 256 slice scanners.
Results: Our findings showed that in 10 slice scanner, selected organ doses were in the range of 0.09-23.1 mSv while in the 256 slice scanner, it was in the range of 0.14-18.01 mSv. The CT Angio protocol has a higher organ dose at all.
Conclusion: In CT Angio protocol, organ dose (except for the lens of eye) is lower in 10 slice compared to 256 slice CT; the brain dose in both protocols has no difference statistically. In the spiral protocol, the dose in 256 slice scanner is lower than the 10 slice scanner which might be due to higher number of detector arrays in 256 slice scanner.Thyroid dose is mainly due to scattered radiation and because of strict beam collimation; it has a small value in all protocols.

Published
2015-03-30
How to Cite
1.
Seyedatashi SF, Athari M, Bitarafan-Rajabi A, Hasanzadeh H, Rafati M, Pouraliakbar HR, Mohammadzadeh A. Dosimetric Evaluation of Multislice CT Using AnthropomorphicHead Phantom. Frontiers Biomed Technol. 2(1):31-35.
Section
Original Article(s)