Publications by authors named "Tooru Ishibashi"
[Coronary Artery Visualization by Using the 64-row MDCT in Pediatric Patients].
Nihon Hoshasen Gijutsu Gakkai Zasshi
August 2022
Purpose: We retrospectively evaluated the visualization of pediatric coronary computed tomography angiography (CCTA) images by using the 64-detector row CT scanner between the electrocardiogram-gated helical scan and non-electrocardiogram-gated helical scan.
Methods: From January 2015 to March 2019, 100 children who underwent CT angiography examination were retrospectively enrolled. Group A consisted of 50 patients with electrocardiogram-gated helical scan.
[New Potential Method for Optimizing the ATCM Technique in Pediatric CT Examination].
Nihon Hoshasen Gijutsu Gakkai Zasshi
September 2020
Purpose: To compare the radiation dose and image quality using the conventional method for performing the front and side scout view and a new method for performing the side scout view, and then correct the table height at the scan isocenter and perform the front scout view.
Methods: We retrospectively analyzed fifty-six children who had underwent computed tomography (CT) examination between June 2014 and August 2018. We divided them into two groups.
[Nationwide Survey of Medical Radiation Exposure on Cardiovascular Examinations in Japan].
Nihon Hoshasen Gijutsu Gakkai Zasshi
February 2020
Purpose: It is very important to manage the radiation dose of cardiovascular interventional (CVI) procedures. Overseas, the diagnostic reference levels for cardiac interventional procedures were established with the air kerma at the patient entrance reference point (Ka,r) and the air kerma-area product (P). Although the Japan DRLs 2015 was established by the Japan Network for Research and Information on Medical Exposure (J-RIME), the Japan DRL for CVIs were established by fluoroscopic dose rates of 20 mGy/min at the patient entrance reference point with 20 cm thickness polymethyl methacrylate (PMMA) phantom.
View Article and Find Full Text PDFPurpose: A three-dimensional (3D) image from computed tomography (CT) angiography is a useful method for evaluation of complex anatomy such as congenital heart disease. However, 3D imaging requires high contrast enhancement for distinguishing between blood vessels and soft tissue. To improve the contrast enhancement, many are increasing the injection rate.
View Article and Find Full Text PDF[Optimization of the chest computed tomography scan by varying the position of the arms].
Nihon Hoshasen Gijutsu Gakkai Zasshi
September 2013
Article Synopsis
- The CT-AEC technique calculates exposure based on initial radiographs but can lead to radiation over-dose during chest scans due to different arm positions.
- This study focuses on optimizing CT-AEC by managing the noise index (NI) to ensure safer chest CT scans.
- Results indicate that by adjusting the NI, it’s possible to reduce radiation exposure while maintaining image quality.
[The comparison between dose rates at the interventional reference point of the angiography systems in many facilities].
Nihon Hoshasen Gijutsu Gakkai Zasshi
August 2012
Article Synopsis
- The study focused on managing radiation doses in interventional radiology, particularly during percutaneous coronary interventions, by measuring entrance surface doses across 27 procedures in Hiroshima cardiac labs.
- It compared X-ray machines using flat-panel detectors (FPD) versus image intensifiers (I.I.), noting that FPD is increasingly used, with variability in fluoroscopy and cineangiography rates across laboratories.
- The findings indicated that while I.I. generally had higher doses, there was no significant difference in radiation levels at the interventional reference point between FPD and I.I., highlighting the need for balancing image quality with radiation dose optimization during procedures.