Spectra, fluence and absorbed doses in sensitive organs due to scattered X-rays during a chest CT. (April 2023)

• Record Type: Journal Article
• Authors: Vazquez-Bañuelos, Joel; Campillo-Rivera, Guillermo Eduardo; Vega-Carrillo, Hector Rene; Torres-Cortes, Carina Oliva; Marquez-Mata, Claudia Angelica; Vasquez-Arteaga, Marcial
• Is Part Of: Applied radiation and isotopes. Volume 194(2023)
• Publication Date: 2023-04
• Subjects: Dosimetry -- Computed tomography -- MCNP5 -- Scattered radiation -- X-rays; Radiology -- Periodicals; Radiation -- Industrial applications -- Periodicals; Nuclear chemistry -- Periodicals; Internet resource; Periodical; 660.298
• DOI: 10.1016/j.apradiso.2023.110723
• Languages: English
• ISSNs: 0969-8043

Abstract

Abstract: The use of ionizing radiation for the treatment and diagnosis of diseases is becoming more frequent. The technologies associated with diagnostic imaging are constantly evolving, allowing faster and cheaper diagnoses to benefit the patient. However, this has caused an increase in the exposure to ionizing radiation of patients and health professionals. One of the diagnostic techniques for obtaining high-resolution anatomical images of patients is computed tomography (CT). Due to the detail and quality of the images obtained with CT, its use is becoming more frequent. The information provided by these images allows the specialist to make better diagnoses; however, exposure to X-rays deposits a dose in the patient. CT represents approximately 20% of all X-ray examinations but it is responsible for 70% of the medical dose accumulated by the patient. During the acquisition of the images, the highest dose is deposited in the area of the body whose image is to be obtained. During the incidence of X-rays, there is dispersion of these that reach sensitive organs whose dose is not evaluated. The objective of this work was to estimate, using Monte Carlo methods, the fluence and X-ray spectra and to obtain a factor that allows knowing the absorbed dose in sensitive organs due to scattered radiation during a chest CT. With the MCNP5 code, the CT equipment and a hybrid anthropomorphic phantom, type BOMAB it was found that the absorbed dose in these organs depends on the size of the organ and the distance between the organ and the surface of the slice on the thorax where the X-rays are incident. Highlights: A factor to estimate the absorbed dose to sensitive organs due to scattered radiation was obtained using MCNP. A factor allows to estimate the absorbed dose in sensitive organs during a CT chest. The absorbed dose, the fluence and X-ray spectra were estimated for a BOMAB-type phantom.