EuroSafe Imaging 2020
Performed at one institution, Diagnostic or prognostic study, Retrospective, Kv imaging, Radiation effects, CT-Angiography, CT, Radioprotection / Radiation dose, Paediatric, Cardiac
T. Yoshiura, T. Masuda, Y. Matsumoto, T. Ishibashi, T. Oku
Although the increasing use of CT has led to tremendous advances in modern medical practice, this trend has been accompanied by a growing concern for patient safety, because CT delivers higher doses of radiation than do most other diagnostic imaging procedures . The risk model estimations and results of recent large-scale epidemiologic studies have predicted an increased risk of cancer associated with CT radiation exposure in radiosensitive children and adolescents [2–7]. Therefore, reducing the exposure dose while maintaining the image quality is important.
There are many methods to reduce the radiation dose at pediatric CT examination. One method for the most reducing radiation dose would be automatic tube current modulation (ATCM). Because automatically determines tube current from differences in body thickness and body size in the axial direction. In addition, the CT device includes a bow-tie filter that reduces the X-ray intensity in the surrounding area by allowing the maximum X-ray intensity to the thickest part of the patient, thereby reducing scattered X-rays and surface dose . Therefore, to use the bow-tie filter and ATCM under the optimal conditions, the patient must be at the scan isocenter . However, smaller subjects performed difficulty in positioning to the scan isocenter. We have developed a new method to properly position a pediatric patient at isocenter by using scout images.
The purpose of this study was to compare with radiation dose and image noise between the conventional method(1.front scout view, 2.side scout view, and 3.main scan) and new method (1.side scout view, 2. table correction by using the CT console grid, 3.front scout view, and main scan).