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Featured researches published by S. Kida.


Radiation Oncology | 2017

Cone-beam CT reconstruction for non-periodic organ motion using time-ordered chain graph model

Masahiro Nakano; Akihiro Haga; Jun’ichi Kotoku; Taiki Magome; Yoshitaka Masutani; Shouhei Hanaoka; S. Kida; Keiichi Nakagawa

PurposeThe purpose of this study is to introduce the new concept of a four-dimensional (4D) cone-beam computed tomography (CBCT) reconstruction approach for non-periodic organ motion in cooperation with the time-ordered chain graph model (TCGM) and to compare it with previously developed methods such as total variation-based compressed sensing (TVCS) and prior-image constrained compressed sensing (PICCS).Materials and MethodsOur proposed reconstruction is based on a model including the constraint originating from the images of neighboring time phases. Namely, the reconstructed time-series images depend on each other in this TCGM scheme, and the time-ordered images are concurrently reconstructed in the iterative reconstruction approach. In this study, iterative reconstruction with the TCGM was carried out with 90° projection ranges. The images reconstructed by the TCGM were compared with the images reconstructed by TVCS (200° projection ranges) and PICCS (90° projection ranges).Two kinds of projection data sets–an elliptic-cylindrical digital phantom and two clinical patients’ data–were used. For the digital phantom, an air sphere was contained and virtually moved along the longitudinal axis by 3 cm/30 s and 3 cm/60 s; the temporal resolution was evaluated by measuring the penumbral width of the air sphere. The clinical feasibility of the non-periodic time-ordered 4D CBCT image reconstruction was examined with the patient data in the pelvic region.ResultsIn the evaluation of the digital-phantom reconstruction, the penumbral widths of the TCGM yielded the narrowest result; the results obtained by PICCS and TCGM using 90° projection ranges were 2.8% and 18.2% for 3 cm/30 s, and 5.0% and 23.1% for 3 cm/60 s narrower than that of TVCS using 200° projection ranges. This suggests that the TCGM has a better temporal resolution, whereas PICCS seems similar to TVCS. These reconstruction methods were also compared using patients’ projection data sets. Although all three reconstruction results showed motion related to rectal gas or stool, the result obtained by the TCGM was visibly clearer with less blurring.ConclusionThe TCGM is a feasible approach to visualize non-periodic organ motion. The digital-phantom results demonstrated that the proposed method provides 4D image series with a better temporal resolution compared to TVCS and PICCS. The clinical patients’ results also showed that the present method enables us to visualize motion related to rectal gas and flatus in the rectum.


Radiotherapy and Oncology | 2013

PO-0676: Verification system for image-guided radiation therapy by using in-treatment 4D CBCT

W. Takahashi; Akihiro Haga; Naoyoshi Yamamoto; Hideomi Yamashita; T. Imae; S. Kida; A. Sakumi; Kuni Ohtomo; T. Kamada; Keiichi Nakagawa


Radiotherapy and Oncology | 2013

PD-0411: Improvement of four dimensional cone beam CT image quality with iterative reconstruction

S. Kida; Yoshitaka Masutani; M. Nakano; Keiichi Nakagawa; Akihiro Haga


Radiotherapy and Oncology | 2013

PD-0043: Accuracy comparison of 3D and 4D CBCT based lung tumor registrations by way of in-treatment 4D CBCT analysis

Keiichi Nakagawa; Akihiro Haga; W. Takahashi; Hideomi Yamashita; T. Imae; S. Kida; Yoshitaka Masutani; A. Sakumi; Kuni Ohtomo


電子情報通信学会技術研究報告. MI, 医用画像 | 2012

Improvement of Cone-beam CT image quality of radiation therapy

S. Kida; Naoya Saotome; Akihiro Haga; Yoshitaka Masutani; Keiichi Nakagawa


Radiotherapy and Oncology | 2012

EP-1458 A COMPARISON OF THREE REGISTRATION METHODS USING 4D PLANNING CT AND ON-BOARD 4D CONE-BEAM CT FOR LUNG VMAT

Keiichi Nakagawa; Yoshitaka Masutani; Akihiro Haga; Hideomi Yamashita; W. Takahashi; A. Sakumi; S. Kida; Naoya Saotome; Kuni Ohtomo; Kiyoshi Yoda


Radiotherapy and Oncology | 2012

OC-0470 DOSE COMPARSION BETWEEN DIFFERENT RESPIRATORY PHASES DURING LUNG VMAT DELIVERY USING IN-TREATMENT 4D CONE-BEAM CT

Naoya Saotome; A. Sakumi; S. Kida; T. Onoe; Akihiro Haga; Yoshitaka Masutani; Kuni Ohtomo; Hideomi Yamashita; Keiichi Nakagawa


Radiotherapy and Oncology | 2011

1266 poster ANALYSIS OF PATIENT SETUP UNCERTAINTIES BY USING IN-TREATMENT CONE-BEAM CT FOR PROSTATE CANCER

K. Shiraishi; Akihiro Haga; S. Katsutake; Naoya Saotome; S. Kida; A. Sakumi; T. Onoe; K. Yamamoto; Kuni Ohtomo; N. Keiichi


Radiotherapy and Oncology | 2011

246 oral 4D-CT RECONSTRUCTION USING MV PORTAL IMAGING DURING VOLUMETRIC MODULATED ARC THERAPY

S. Kida; Naoya Saotome; Akihiro Haga; Yoshitaka Masutani; Hideomi Yamashita; A. Sakumi; Kuni Ohtomo; N. Keiichi


Radiotherapy and Oncology | 2011

1175 poster BEAM'S EYE VIEW BASED VERIFICATION OF ACTUAL DELIVERY USING IN-TREATMENT 4D CONE-BEAM CT

Keiichi Nakagawa; Akihiro Haga; Hideomi Yamashita; S. Kida; Naoya Saotome; A. Sakumi; T. Imae; Kuni Ohtomo; Yoshitaka Masutani; Kiyoshi Yoda

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Naoya Saotome

National Institute of Radiological Sciences

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S Itoh

University of Tokyo

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