Assessment of Safety and Exposure Conditions during Obstetric Ultrasound at King Abulaziz University Hospital
Sarah Kamal Hagi
Department of Radiology, King Abdulaziz University Hospital, Jeddah, Saudi Arabia
Abstract: Purpose: The objective of this study was to measure and evaluate machine output indices during obstetric scans at a local public hospital. Methods: A cross-sectional descriptive study was conducted at the Radiology Department of King Abdulaziz University Hospital (KAUH), Jeddah, between September and October 2011. The machine settings, including the thermal index (TI) and mechanical index (MI) as well as scan times were recorded during obstetric ultrasound examinations. Data were analyzed using the Statistical Package for the Social Sciences. Independent t-test and one-way ANOVA were used to compare continuous variables. Results: A total of 347 scans were studied. Most of them were performed in pulsed Doppler mode (n=176 ; 50.7%). Examination scan times varied between 1 to 27 minutes. The highest recorded TI value was 2.1, with mean ± SD of 0.81 ± 0.53 for examinations that lasted less than 15 minutes. The highest TI and MI values were observed during pulse Doppler.Conclusion: Thermal index values are within recommended safety guidelines. However, MI values sometimes exceed 1 and exposure times should be monitored to restrict the occurrence of any biologic effects due to ultrasound waves.
[Sarah Kamal Hagi. Assessment of Safety and Exposure Conditions during Obstetric Ultrasound at King Abulaziz University Hospital. J Am Sci 2012;8(10):287-290]. (ISSN: 1545-1003).http://www.jofamericanscience.org. 42
Keywords: Mechanical index, obstetric ultrasound, thermal index, ultrasound bioeffects Full Text 42