Estimating the Entrance Surface Dose in the Eyes, Thyroid, and Parotid Gland Regions in Adult and Pediatric Groups: A Cone-Beam Computed Tomography Technique

Reza  Omidi; Fariba  Farhadi Birgani; Ali Asghar Parach; Hamed  Zamani; Saman  Dalvand; Fatemeh  Ezoddini-Ardakani; Nasim Namiranian; Mohammad Hosein  Zare

doi:10.18502/fbt.v9i1.8139

Reza Omidi Department of Medical Physics, School of Medicine, Shahid Sadoughi University of Medical Sciences, Yazd, Iran
Fariba Farhadi Birgani Department of Radiologic Technology, Shoushtar Faculty of Medical Sciences, Shoushtar, Iran
Ali Asghar Parach Department of Medical Physics, School of Medicine, Shahid Sadoughi University of Medical Sciences, Yazd, Iran
Hamed Zamani Department of Medical Physics, School of Medicine, Shahid Sadoughi University of Medical Sciences, Yazd, Iran
Saman Dalvand Department of Medical Physics, Faculty of Medical Sciences, Tarbiat Modares University, Tehran, Iran
Fatemeh Ezoddini-Ardakani Department of Oral and Maxillofacial Radiology, Faculty of Density, Shahid Sadoughi University of Medical Sciences, Yazd, Iran
Nasim Namiranian Yazd Diabetes Research Center, Shahid Sadoughi University of Medical Sciences, Yazd, Iran
Mohammad Hosein Zare Department of Medical Physics, School of Medicine, Shahid Sadoughi University of Medical Sciences, Yazd, Iran

DOI: https://doi.org/10.18502/fbt.v9i1.8139

Keywords: Entrance Surface Dose; Cone-Beam Computed Tomography; Maxillofacial Imaging; Adult; Pediatric.

Abstract

Purpose: This study aimed to determine the Entrance Surface Dose (ESD) of sensitive organs in Cone-Beam Computed Tomography (CBCT) imaging of the maxillofacial region in the two age groups of adult and pediatric.

Materials and Methods: In this work, the measurements were performed using Thermo Luminescent Dosimeters (TLD-GR200). The imaging was performed using a PROMAX 3D CBCT scanner for 30 adults and 20 pediatric patients. The ESD value for each patient in the region of eyes, thyroid, and parotid glands was measured by 15 TLDs during CBCT of maxillofacial.

Results: The highest and lowest mean values of ESDs were related to the parotid and thyroid gland regions in adults, 4.77 ± 0.61 mGy and 0.37 ± 0.16 mGy, respectively. In addition, these values were obtained 2.97 ± 0.36 mGy and 0.35 ± 0.12 mGy in pediatric groups as the highest and lowest values in that order. The results showed that the ESD values of the parotid gland regions in maxilla and mandible examinations had a significant difference (P <0.05). In addition, there was a significant difference between the ESD values of the parotid gland regions among the adults and pediatric groups (P <0.05).

Conclusion: According to the results, the ESD values in both age groups were higher in the parotid gland region during maxillofacial CBCT examinations. Therefore, it is recommended to set radiation parameters like mAs as low as possible for reducing the patient dose, especially pediatric patients due to the more sensitive organs.