2016年12月26日月曜日

MEDIX誌への論文掲載

MEDIX誌に窪田直人先生らとの共著論文が掲載されました。

窪田直人, 中川 徹, 小泉憲裕, 佐久間一郎, 門脇 孝, "超音波を用いた内臓脂肪面積計測の開発," MEDIX, Vol.65, pp.11-13, 2016.

内臓脂肪の蓄積は2型糖尿病をはじめとするさまざまな生活習慣病の基盤病態であることが広く認知されている。内臓脂肪は臍位置でのCT断面像で計測された内臓脂肪面積(Visceral Fat Area:以下、VFA)の計測で評価されるが、短期間で繰り返し計測が可能である簡便な測定法が望まれてきた。

そこでわれわれは、超音波診断装置を用いてComputed Tomography(以下、CT)で計測されたVFAと高い相関を持つ推定VFA測定技術の開発を行った。また、健診データからVFAと年齢、BMIの関係について解析を行い、VFA計測の必要性を確認した。ここでは、超音波を用いたVFA計測の開発背景や計測技術の概要、健診データ解析結果について報告する。

2016年12月25日日曜日

IJMRCAS誌への論文掲載

International Journal of Medical Robotics and Computer Assisted Surgery (IJMRCAS)誌に徐 俊浩先生らとの共著論文が掲載されました。

Joonho Seo, Norihiro Koizumi, Mamoru Mitsuishi, and Naohiko Sugita, "Ultrasound image based visual servoing for moving target ablation by high intensity focused ultrasound," International Journal of Medical Robotics and Computer Assisted Surgery (IJMRCAS)e1793, DOI: 10.1002/rcs.1793, 2016. 

Abstract

Background:
Although high intensity focused ultrasound (HIFU) is a promising technology for tumor treatment, a moving abdominal target is still a challenge in current HIFU systems. In particular, respiratory-induced organ motion can reduce the treatment efficiency and negatively influence the treatment result. In this research, we present: (1) a methodology for integration of ultrasound (US) image based visual servoing in a HIFU system; and (2) the experimental results obtained using the developed system.

Materials and methods:
In the visual servoing system, target motion is monitored by biplane US imaging and tracked in real time (40 Hz) by registration with a preoperative 3D model. The distance between the target and the current HIFU focal position is calculated in every US frame and a three-axis robot physically compensates for differences. Because simultaneous HIFU irradiation disturbs US target imaging, a sophisticated interlacing strategy was constructed.

Results:
In the experiments, respiratory-induced organ motion was simulated in a water tank with a linear actuator and kidney-shaped phantom model. Motion compensation with HIFU irradiation was applied to the moving phantom model. Based on the experimental results, visual servoing exhibited a motion compensation accuracy of 1.7 mm (RMS) on average. Moreover, the integrated system could make a spherical HIFU-ablated lesion in the desired position of the respiratory-moving phantom model.

Conclusions:
We have demonstrated the feasibility of our US image based visual servoing technique in a HIFU system for moving target treatment.

2016年12月3日土曜日

5th Joint Meeting of the Acoustical Society of America and Acoustical Society of Japanにおける成果発表

5th Joint Meeting of the Acoustical Society of America and Acoustical Society of Japanにおいて成果発表を行いました。電気通信大学小泉研究室の学生にとって初めての国際会議発表です。超音波診断・治療支援システムに関する発表で、司会のMichael Bailey先生からも激励コメントをいただきました!発表の様子が下記のサイトで配信されておりますので、よろしければぜひご高覧ください!

4pBA. Medical Acoustics in Kidney and Liver Disease Part 2
Thursday, 12/1/2016—1:00 - 5:30 p.m. HST
Cochairs: Norihiro Koizumi (The Univ. of Electro-Communications (UEC)), Michael Bailey (Univ. of Washington), Hiroyuki Fukuda (Yokohama City Univ. Medical Center) and Adam Maxwell (Univ. of Washington)

配信サイト:
https://attendee.gotowebinar.com/register/9153943753598749185

Abstracts:
[1] Atsushi Kayasuga, Norihiro Koizumi, Kyohei Tomita, Yu Nishiyama
, Hiroyuki Tsukihara, Hiroyuki Fukuda, Kiyoshi Yoshinaka, Takashi Azuma, Hideyo Miyazaki, Naohiko Sugita, Kazushi Numata, Yukio Honma, Yoichiro Matsumoto, and Mamoru Mitsuishi, "Robust servoing method for renal stones/tumors for the noninvasive ultrasound theragnostic system," The Journal of the Acoustical Society of America (JASA), 4pBA2, 140(4):3306-3307, 2016 (DOI: 10.1121/1.4970528).

[2] Kyohei Tomita, Norihiro Koizumi, Ryosuke Kondo, Atsushi Kayasuga, Yu Nishiyama, Hiroyuki Tsukihara, Hiroyuki Fukuda, Kazushi Numata, Yoichiro Matsumoto, and Mamoru Mitsuishi, "Liver tracking system utilizing template matching and energy function in high intensity focused ultrasound/radio frequency ablation therapy," The Journal of the Acoustical Society of America (JASA), 4pBA10, 140(4):3309-3309, 2016 (DOI: 10.1121/1.4970536).

[3] Norihiro Koizumi, Hiroyuki Tsukihara, Kiyoshi Yoshinaka, Hideyo Miyazaki, Hiroyuki Fukuda, Kazushi Numata, Yukio Homma, Yoichiro Matsumoto, and Mamoru Mitsuishi, "Construction methodology for non-invasive ultrasound theragnostic system by medical digitalization," The Journal of the Acoustical Society of America (JASA), 4pBA11, 140(4):3309-3309, 2016 (DOI: 10.1121/1.4970537).

[4] Ryosuke Kondo, Norihiro Koizumi, Kyohei Tomita, Atsushi Kayasuga, Yu Nishiyama, Hiroyuki Tsukihara, Hiroyuki Fukuda, Kazushi Numata, Yoichiro Matsumoto, and Mamoru Mitsuishi, " An ultrasound guided monitoring system for high intensity focused ultrasound and radio frequency ablation therapies," The Journal of the Acoustical Society of America (JASA), 4pBA12, 140(4):3309-3309, 2016 (DOI: 10.1121/1.4970538).

松本洋一郎先生と会場で記念写真

司会のMichael Bailey先生と会場で記念写真