JaLCDOI 10.18926/AMO/54976
フルテキストURL 71_2_91.pdf
著者 Ogawa, Nanako| Sato, Shuhei| Ida, Kentaro| Kato, Katsuya| Ariyoshi, Yuichi| Wada, Koichiro| Nasu, Yasutomo| Kanazawa, Susumu|
抄録 The aim of this study was to investigate the utility of single-source dual-energy computed tomography (SS-DECT) composition analysis in characterizing different types of urinary stones and differentiating them from phleboliths. This study included 29 patients with urinary stones who were scheduled for surgery. All patients were scanned, first using single-energy computed tomography acquisition and then DECT acquisition on SS-DECT. Dual-energy data were archived to a Gemstone spectral imaging (GSI) viewer (GE Healthcare, Milwaukee, WI, USA). Hounsfield units (HU) and effective atomic numbers (Zeff) were estimated using the GSI viewer. The results of dual-energy analysis were compared with the biochemical constitution of the stones. The chemical analysis determined that the stones included 32 calcium-based, 6 cystine and 1 struvite stone. Both HU and Zeff values were helpful in differentiating calcium-based stones from cystine and struvite stones and phleboliths. The Zeff values of phleboliths were significantly higher than those for struvite and cystine stones, whereas it was difficult to distinguish phleboliths from struvite and cystine stones using the HU values. Composition analysis using SS-DECT is helpful for distinguishing urinary stone types and discriminating phleboliths from urinary stones. Zeff values may be more useful than HU values for differentiating urinary stones from phleboliths.
キーワード single-source dual-energy computed tomography effective atomic number urinary stone phlebolith
Amo Type Original Article
発行日 2017-04
出版物タイトル Acta Medica Okayama
71巻
2号
出版者 Okayama University Medical School
開始ページ 91
終了ページ 96
ISSN 0386-300X
NCID AA00508441
資料タイプ 学術雑誌論文
言語 English
著作権者 CopyrightⒸ 2017 by Okayama University Medical School
論文のバージョン publisher
査読 有り
PubMed ID 28420889
JaLCDOI 10.18926/AMO/32894
フルテキストURL fulltext.pdf
著者 Mifune, Hirofumi| Akaki, Shiro| Ida, Kentaro| Sei, Tetsuro| Kanazawa, Susumu| Okada, Hiroyuki|
抄録 <P>To evaluate the ability of multidetector-row CT (MDCT) to predict a risk of hemorrhage in patients with esophageal varices, a total of 40 MDCT scans were performed in 29 patients who had been diagnosed with esophageal varices by conventional upper gastrointestinal tract endoscopy. In 11 patients, MDCT was performed both before and after endoscopic injection sclerotherapy (EIS). Endoscopically, the red color sign (RC sign) was present in 28 scans. Of the 11 patients who underwent EIS, the RC sign disappeared after EIS in 9. The MDCT scans were obtained in the arterial, portal, and equilibrial phases, and the portal phase images were used in this study. Subsequently, the extent of esophageal varices was categorized into four MDCT scores. The variceal score, the maximum short axis of the varices, and the presence of palisade vein dilatation obtained from MDCT had significant correlation with endoscopic variceal forms, and the presence and severity of RC sign, respectively (p<0.01). All cases with a maximum minor axis of more than 4 mm showed positive RC sign. MDCT was useful in the evaluation of esophageal varices for predicting a risk of hemorrhage.
キーワード esophageal varices red color sign MDCT
Amo Type Original Article
発行日 2007-10
出版物タイトル Acta Medica Okayama
61巻
5号
出版者 Okayama University Medical School
開始ページ 247
終了ページ 254
ISSN 0386-300X
NCID AA00508441
資料タイプ 学術雑誌論文
言語 English
論文のバージョン publisher
査読 有り
PubMed ID 17971841
Web of Sience KeyUT 000250431700002
JaLCDOI 10.18926/AMO/30978
フルテキストURL fulltext.pdf
著者 Matsushita, Toshi| Anami, Daigo| Arioka, Tadashi| Inoue, Seiji| Kariya, Yusuke| Fujimoto, Masako| Ida, Kentaro| Sasai, Nobuya| Kaji, Mitsumasa| Kanazawa, Susumu| Joja, Ikuo|
抄録 <p>With the aim of sequence optimization in susceptibility-weighted imaging (SWI), 2 image acquisition parameters (slice thickness and matrix size) and 2 image processing conditions (number of slices per minimum intensity projection (MIP) and Sliding Window) were investigated using a 1.5-T magnetic resonance imaging (MRI) system. The subjects were 12 healthy volunteers and the target region for scanning was the whole brain. Informed consent was obtained from all subjects. First, susceptibility-weighted images were acquired with various slice thicknesses from 1mm to 5mm and various matrix sizes from 256x256 to 512x512, and the images were assessed in terms of the contrast-to-noise ratio (CNR) and were also visually evaluated by three radiologists. Then, the number of slices per MIP and the usefulness of the Sliding Window were investigated. In the study of the optimal slice thickness and matrix size, the results of visual evaluation suggested that a slice thickness of 3mm and a matrix size of 448x448 are optimal, while the results of evaluation based on CNR were not significant. As regards the image processing conditions, the results suggested that the number of slices per MIP should be set to a minimum value of 2 and that the use of Sliding Window is effective. The present study provides useful reference data for optimizing SWI sequences.</p>
キーワード susceptibility phase contrast-to-noise ratio number of slices per MIP Sliding Window
Amo Type Original Article
発行日 2008-06
出版物タイトル Acta Medica Okayama
62巻
3号
出版者 Okayama University Medical School
開始ページ 159
終了ページ 168
ISSN 0386-300X
NCID AA00508441
資料タイプ 学術雑誌論文
言語 English
論文のバージョン publisher
査読 有り
PubMed ID 18596832
Web of Sience KeyUT 000257130300003
JaLCDOI 10.18926/AMO/30714
フルテキストURL fulltext.pdf
著者 Ida, Kentaro| Akaki, Shiro| Sei, Tetsuro| Tsunoda, Masatoshi| Kanazawa, Susumu|
抄録 To determine the efficacy of flow-sensitive alternating inversion recovery using half-Fourier single-shot turbo spin-echo (FAIR-HASTE) in detecting cerebral hypoperfusion in chronic carotid occlusive disease, we subjected 12 patients with various degrees of cervical internal carotid artery stenoses and/or occlusion (Stenosis group) and 24 volunteers (Normal group) to FAIR-HASTE. In addition, 10 out of 12 patients in the Stenosis group underwent dynamic susceptibility contrast-perfusion magnetic resonance imaging (DSC-pMRI) before and after revascularization in the dominantly affected side. The absolute asymmetry indexes (AIs) of both cerebral hemispheres in the Normal and Stenosis groups were compared in FAIR-HASTE. In addition, the AIs were compared with those in the Stenosis group before and after revascularization in both FAIR-HASTE and regional cerebral blood flow (rCBF), calculated with DSC-pMRI. A statistically significant difference was recognized between the AIs in the Normal and Stenosis groups (AI = 2.25 +- 1.92, 8.09 +- 4.60, respectively ; p &#60; 0.0001). Furthermore, in the Stenosis group the AIs on both FAIR-HASTE (8.88 +- 4.93, 2.22 +- 1.79, respectively ; p = 0.0003) and rCBF (7.13 +- 3.57, 1.25 +- 1.33, respectively ; p = 0.0003) significantly decreased after revascularization. In the Stenosis group, before revascularization, signal intensity on both FAIR-HASTE and rCBF had a tendency to be lower in the dominantly affected side. FAIR-HASTE imaging was useful in the detection and evaluation of cerebral hypoperfusion in chronic occlusive carotid disease.
キーワード brain perfusion MRI FAIR HASTE
Amo Type Article
発行日 2006-08
出版物タイトル Acta Medica Okayama
60巻
4号
出版者 Okayama University Medical School
開始ページ 215
終了ページ 221
ISSN 0386-300X
NCID AA00508441
資料タイプ 学術雑誌論文
言語 English
論文のバージョン publisher
査読 有り
PubMed ID 16943858
Web of Sience KeyUT 000239911100002