[HTML][HTML] Optimization of injection dose in 18F-FDG PET/CT based on the 2020 national diagnostic reference levels for nuclear medicine in Japan

H Sagara, K Inoue, H Yaku, A Ohsawa… - Annals of Nuclear …, 2021 - Springer
Objective Recently, the national diagnostic reference levels (DRLs) in Japan were revised
as the DRLs 2020, wherein the body weight-based injection dose optimization in positron …

[HTML][HTML] Measurements and future projections of Gd-based contrast agents for MRI exams in wastewater treatment plants in the Tokyo metropolitan area

…, R Isoda, Y Taguchi, S Hosokawa, H Sagara… - Marine Pollution …, 2022 - Elsevier
Large amounts of Gd-based contrast agents are used in magnetic resonance imaging (MRI)
that are then excreted in urine. These agents are subsequently discharged into the …

Effects of optimization of injection dose on image quality and radiation exposure dose in FDG PET tests.

H Sagara, K Inoue, A Ohsawa, T Someya… - 2021 - Soc Nuclear Med
3017 Objectives: The injection dose affects the image quality and radiation exposure dose
in 18 F-FDG PET tests. In this study, we optimized injection dose by adjusting it by patient’s …

Changes on distribution of absorbed dose rates in air in an urban area after the Fukushima Daiichi Nuclear Power Plant accident

…, S Soyama, S Hosokawa, T Kato, H Sagara… - … of radioanalytical and …, 2021 - Springer
Tokatsu area was on one pathway of the radioactive plumes released in the Fukushima Daiichi
Nuclear Power Plant accident and absorbed dose rate in air significantly increased there …

A new simpler image quality index based on body size for FDG-PET/CT

H Sagara, K Inoue, H Yaku, A Ohsawa… - Nuclear Medicine …, 2024 - journals.lww.com
Noise equivalent count density (NEC density) is often used to evaluate the image quality of
whole-body fluorodeoxyglucose tomography tests. However, this index is calculated using …

Changes in environmental radiation levels in Katsushika Ward, Tokyo after the Fukushima Daiichi Nuclear Power Plant accident

…, K Inoue, M Ichihara, S Nakazawa, H Sagara… - … of Radioanalytical and …, 2021 - Springer
Katsushika Ward, located in northeastern Tokyo, had the highest deposition in Tokyo of
artificial radionuclides after the Fukushima Daiichi Nuclear Power Plant accident. A car-borne …

Changes on Distribution of Absorbed Dose Rate in Air Related with Infrastructure Projects on Phu Quoc Island, Vietnam

…, M Ichihara, Y Taguchi, H Sagara - Radiation Environment …, 2021 - jstage.jst.go.jp
The absorbed dose rate in air was measured all over Phu Quoc Island, Vietnam after
infrastructure projects were undertaken, and changes on dose rates related with these projects …

The optimization of image quality in dynamic whole-body PET imaging using phantom and clinical data

H Sagara, K Inoue, A Ohsawa, Y Muramatsu, H Fujii… - 2023 - Soc Nuclear Med
T26 Introduction: Whole-body dynamic PET images are acquired using multiple continuous
bed motion (CBM) methods. Previous studies have reported the clinical usefulness of whole-…

Evaluation of the effects of injection dose on image quality in patients who receive multiple FDG-PET/CT examinations

H Sagara, K Inoue, H Yaku, A Ohsawa, C Mano… - 2022 - Soc Nuclear Med
4114 Introduction: The injection dose of [ 18 F]-fluorodeoxyglucose (FDG) most strongly affects
the image quality and the effective dose in the examined individual; moreover, it can alter …

Quantitative Image Evaluation by Changing Uptake Time in the Same Patient in PET/CT Test

A Ohsawa, H Sagara, H Yaku, S Ohashi, Y Muramatsu… - 2022 - Soc Nuclear Med
4115 Introduction: In PET/CT tests, uptake time variation changes the background and the
amount of FDG uptake for each organ. In this study, we quantitatively analyzed the …