A three-dimensional cross-directional bilateral filter for edge-preserving noise reduction of low-dose computed tomography images
K Ichikawa, H Kawashima, M Shimada, T Adachi… - Computers in Biology …, 2019 - Elsevier
Background Image-based noise reduction techniques are useful because they can be
applied across various computed tomography (CT) scanner models from different vendors …
applied across various computed tomography (CT) scanner models from different vendors …
Quality evaluation of image‐based iterative reconstruction for CT: comparison with hybrid iterative reconstruction
H Kawashima, K Ichikawa, K Matsubara… - Journal of Applied …, 2019 - Wiley Online Library
The purpose of this study is to evaluate the physical image quality of a commercially
available image‐based iterative reconstruction (IIR) system for two object contrasts to …
available image‐based iterative reconstruction (IIR) system for two object contrasts to …
[HTML][HTML] Effects of various generations of iterative CT reconstruction algorithms on low-contrast detectability as a function of the effective abdominal diameter: a …
Purpose To investigate how various generations of iterative reconstruction (IR) algorithms
impact low-contrast detectability (LCD) in abdominal computed tomography (CT) for different …
impact low-contrast detectability (LCD) in abdominal computed tomography (CT) for different …
Performance comparison of ultra‐high‐resolution scan modes of two clinical computed tomography systems
H Kawashima, K Ichikawa, T Takata, H Nagata… - Medical …, 2020 - Wiley Online Library
Purpose Two ultra‐high‐resolution (UHR) computed tomography (CT) scanners are
clinically available. One is achieved by a CT system with a 0.25 mm× 160 row detector …
clinically available. One is achieved by a CT system with a 0.25 mm× 160 row detector …
Performance of clinically available deep learning image reconstruction in computed tomography: a phantom study
H Kawashima, K Ichikawa, T Takata… - Journal of Medical …, 2020 - spiedigitallibrary.org
Purpose: To assess the physical performance of deep learning image reconstruction (DLIR)
compared with those of filtered back projection (FBP) and iterative reconstruction (IR) and to …
compared with those of filtered back projection (FBP) and iterative reconstruction (IR) and to …
A tin filter's dose reduction effect revisited: using the detectability index in low-dose computed tomography for the chest
A Hasegawa, K Ichikawa, Y Morioka, H Kawashima - Physica Medica, 2022 - Elsevier
Purpose To reevaluate a tin filter's (TF) dose reduction effect in computed tomography (CT)
using a combination of an anthropomorphic chest phantom and a rod-shaped phantom …
using a combination of an anthropomorphic chest phantom and a rod-shaped phantom …
Image quality comparison of a nonlinear image-based noise reduction technique with a hybrid-type iterative reconstruction for pediatric computed tomography
S Watanabe, K Ichikawa, H Kawashima, Y Kono… - Physica Medica, 2020 - Elsevier
Purpose To compare computed tomography (CT) image properties between a vendor-
independent image-based noise reduction technique, Image-space Noise Reduction (iNoir) …
independent image-based noise reduction technique, Image-space Noise Reduction (iNoir) …
Assessment of uncertainty depending on various conditions in modulation transfer function calculation using the edge method
S Maruyama - Journal of Medical Physics, 2021 - journals.lww.com
In medical X-ray imaging, to perform optimal operations, it is essential for the user to
understand whether a required image quality level which depends on a diagnostic task can …
understand whether a required image quality level which depends on a diagnostic task can …
Task-specific spatial resolution properties of iterative and deep learning-based reconstructions in computed tomography: Comparison using tasks assuming small and …
K Matsuura, K Ichikawa, H Kawashima - Physica Medica, 2022 - Elsevier
Purpose The present study aims to evaluate TTFs of deep-learning-based image
reconstruction (DLIR) and iterative reconstruction (IR) in computed tomography (CT) using a …
reconstruction (DLIR) and iterative reconstruction (IR) in computed tomography (CT) using a …
Spatial resolution compensation by adjusting the reconstruction kernels for iterative reconstruction images of computed tomography
K Sugisawa, K Ichikawa, A Urikura, K Minamishima… - Physica Medica, 2020 - Elsevier
Purpose Hybrid iterative reconstruction (IR) is useful to reduce noise in computed
tomography (CT) images. However, it often decreases the spatial resolution. The ability of …
tomography (CT) images. However, it often decreases the spatial resolution. The ability of …