- 著者
- Ehara Mariko Surmely Jean-Francois Kawai Masato Katoh Osamu Matsubara Tetsuo Terashima Mitsuyasu Tsuchikane Etsuo Kinoshita Yoshihisa Suzuki Tomomichi Ito Tatsuya Takeda Yoshihiro Nasu Kenya Tanaka Nobuyoshi Murata Akira Suzuki Yasuyuki Sato Koyo Suzuki Takahiko
- 出版者
- 社団法人日本循環器学会
- 雑誌
- Circulation journal : official journal of the Japanese Circulation Society (ISSN:13469843)
- 巻号頁・発行日
- vol.70, no.5, pp.564-571, 2006-04-20
- 参考文献数
- 23
- 被引用文献数
- 19 174
Background Multislice computed tomography (MSCT) is a promising noninvasive method of detecting coronary artery disease (CAD). However, most data have been obtained in selected series of patients. The purpose of the present study was to investigate the accuracy of 64-slice MSCT (64 MSCT) in daily practice, without any patient selection. Methods and Results Using 64-slice MSCT coronary angiography (CTA), 69 consecutive patients, 39 (57%) of whom had previously undergone stent implantation, were evaluated. The mean heart rate during scan was 72beats/min, scan time 13.6s and the amount of contrast media 72mL. The mean time span between invasive coronary angiography (ICAG) and CTA was 6 days. Significant stenosis was defined as a diameter reduction of >50%. Of 966 segments, 884 (92%) were assessable. Compared with ICAG, the sensitivity of CTA to diagnose significant stenosis was 90%, specificity 94%, positive predictive value (PPV) 89% and negative predictive value (NPV) 95%. With regard to 58 stented lesions, the sensitivity, specificity, PPV and NPV were 93%, 96%, 87% and 98%, respectively. On the patient-based analysis, the sensitivity, specificity, PPV and NPV of CTA to detect CAD were 98%, 86%, 98% and 86%, respectively. Eighty-two (8%) segments were not assessable because of irregular rhythm, calcification or tachycardia. Conclusion Sixty-four-MSCT has a high accuracy for the detection of significant CAD in an unselected patient population and therefore can be considered as a valuable noninvasive technique.
- 著者
- OHTSUKI Masaaki KAWAI Masato FUKUI Masahiro
- 出版者
- The Institute of Electronics, Information and Communication Engineers
- 雑誌
- IEICE transactions on electronics (ISSN:09168524)
- 巻号頁・発行日
- vol.92, no.4, pp.500-507, 2009-04-01
- 被引用文献数
- 4 5
Accompanying with the popularization of portable equipments, and the rapid growth of the size of the electric systems, efficient low power design methodologies have been highly required. To satisfy these requests, a high accurate and high efficient power analysis in higher abstraction level is very important. The design environment is composed by efficient algorithms of power modeling, power library building, and data extracting. Those components of the environment should be balanced for the total efficiency and accuracy. We have proposed a new efficient power modeling environment which uses a look-up table (LUT). It reduces the size of the LUT drastically, compared to conventional algorithms. It makes the power analysis and library building high efficient. The experimental results show that our approach reduces the computation time to build the library to one tenth while keeping the accuracy of the power analysis. The RMS error and the largest error has been less than 8.30%, 59.16%, respectively.