24May 2018

EVALUATION OF RADIATION DOSE TO THYROID GLANDS DURING DIAGNOSTIC MAMMOGRAPHY; A COMPARISON OF CRANIO CAUDAL (CC) AND MEDIO LATERAL OBLIQUE (MLO) VIEWS.

  • Department of Radiography/Radiotherapy, Faculty of Allied Health Sciences, General Sir John Kotelawale Defence University.
  • Department of Basic Sciences, Faculty of Allied Health Sciences, General Sir John Kotelawale Defence University.
  • Department of Pre-clinical sciences, Faculty of Medicine, General Sir John Kotelawale Defence University.
  • Department of Medical Imaging and Nuclear Medicine, Union Hospital, Tongji Medical College, Huazhong University of Science and Technology (HUST), Wuhan, Hubei, China.
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Objectives: Mammogram plays a major role in diagnosing breast cancers in the medical imaging sector though it can cause a radiation hazard on thyroid gland. This study was design to determine the association of Entrance Surface Dose (ESD) for thyroid between the Cranio Caudal (CC) and Medio Lateral Oblique (MLO) projections. Methods: A total of 75 female patients with the mean age of 53.1 ? 8.9 years participated for the study. Breast was compressed in both the CC and the MLO views. ESD of the skin overlying thyroid was measured by an electronic pocket dosimeter at the level of the palpable thyroid cartilage. ESD for each projection, thickness of the compressed breast and the angle of the MLO view were recorded. The compression of breast thickness and the angle of MLO projections were evaluated with ESD of CC and MLO views. The data was analyzed using Minitab version 14.1. Results: All the patients were subjected to mammogram ESD of CC range from 2.4 to 8.3μSv/hr and ESD of MLO range from 2.1 to 9.5 μSv/hr. ESD values in MLO projections were significantly higher thanCC projections (p< 0.001). In addition, ESD values of CC and MLO projections are significantly increased with compression of breast thickness (CC: p = 0.032, MLO: p = 0.002). However, no significant associations were found between ESD and the angle of the MLO views (RMLO: p = 0.472, LMLO: p = 0.798). Conclusions: CC view might be effective for patients to be exposed to low amount of radiation to thyroid. In addition, radiation dose to the thyroid gland can be minimized, using proper compression of breast thickness.

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[GGC Perera, WSS Jayasinghe, WBC Nisansala, DDN Wimalarathne, GLS Galgamuwa and G Senanayake. (2018); EVALUATION OF RADIATION DOSE TO THYROID GLANDS DURING DIAGNOSTIC MAMMOGRAPHY; A COMPARISON OF CRANIO CAUDAL (CC) AND MEDIO LATERAL OBLIQUE (MLO) VIEWS. Int. J. of Adv. Res. 6 (May). 851-858] (ISSN 2320-5407). www.journalijar.com

Dewalage Dilani Neranjana Wimalarathne
Department of Radiography and Radiotherapy, Faculty of Allied Health Sciences, General Sir John Kotelawala Defence University, Sri Lanka.,Department of Medical Imaging and Nuclear Medicine, Tongji Medical College, Huazhong University of Science and Technology, Hubei, China

DOI:

Article DOI: 10.21474/IJAR01/7105      
DOI URL: https://dx.doi.org/10.21474/IJAR01/7105

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