著者
小野 純一 樋口 佳則 町田 利生 松田 信二 石毛 聡 永野 修 田島 洋佑
出版者
一般社団法人 日本脳卒中の外科学会
雑誌
脳卒中の外科 (ISSN:09145508)
巻号頁・発行日
vol.43, no.2, pp.118-124, 2015 (Released:2015-05-27)
参考文献数
19

The natural history of intracranial arterial dissection is not well known. This study was conducted to elucidate the serial changes of radiographic findings and the long-term outcomes in both hemorrhagic and non-hemorrhagic patients who underwent intracranial vertebrobasilar artery dissection.Among 200 patients who underwent intracranial arterial dissection of the vertebrobasilar system, 99 (49.5%) were conservatively managed. These patients were divided into two groups: the hemorrhagic group (H, subarachnoid hemorrhage; n = 24 patients) and non-hemorrhagic group (NH, ischemia or headache; n = 75). Age, site of dissection, initial radiological findings and serial changes, follow-up period, and long-term outcome were analyzed. Outcomes were evaluated using the Glasgow Outcome Scale.Results: The median ages were 54 and 52 years in the H and NH groups, respectively. In both groups, the vertebral artery was most commonly affected, followed by the basilar artery. Regarding radiographic findings, the pearl-and-string sign was the most common initial finding in the H group. Conversely, tapering, narrowing, or occlusion was the most common finding in the NH group. As for serial changes in radiographic findings, no change was most frequent in both groups, followed by improvement. These changes mostly occurred within a few months in the H group but over several years in the NH group. The mean follow-up periods were 7.2 and 5.7 years in the H and NH groups, respectively. Regarding long-term outcomes, in the H group, 15 patients (62.5%) had a good recovery, and 7 (29.2%) died. In the NH group, 58 patients (77.5%) recovered, and 7 (9.3%) died. The cause of poor outcome was initial hemorrhage or subsequent rupture in the H group. Poor outcomes in the NH group were primarily due to systemic problems.These results demonstrate the long-term radiological changes and outcomes associated with the intracranial arterial dissection of the vertebrobasilar system. However, these findings are insufficient to argue the natural history of this disease because patients who received surgical treatment were excluded from this study.
著者
篠崎 真 田島 洋 前田 秀一
出版者
一般社団法人 日本画像学会
雑誌
日本画像学会誌 (ISSN:13444425)
巻号頁・発行日
vol.39, no.3, pp.217-228, 2000
被引用文献数
2

溶融型熱転写方式カラープリンターにて三種の用紙に同一条件で印刷しその画質を評価した.<br> 画像境界部の評価ではTEPおよびNEPを評価し,合成紙,多孔性塗膜塗工紙,上質紙の順に画質が優れているという結果が得られた.多孔性塗膜塗工紙はTEPでは合成紙に近い値を,NEPでは上質紙に近い値を示した.<br> 階調再現性においては,合成紙は階調再現性が忠実であり,上質紙はややアンダー気味,多孔性塗膜塗工紙はややオーバー気味,という傾向が見られた.多孔性塗膜塗工紙は30%程度以下の網点面積率においては合成紙とほぼ同等の性能を示し,また網点面積率の高い領域では本実験の印字モードでは過剰に転移するという結果が得られた.<br> モトル評価および粒状性評価では,上質紙に比べて合成紙と多孔性塗膜塗工紙は優れているという結果を得た.<br> 上述の印刷品位は表面粗さでほとんど説明できると思われるものの,なかで多孔性塗膜塗工紙は特異な傾向を示している.多孔性塗膜塗工紙は表面の多孔性塗膜によって吸液性,断熱性,クッション性が付与され,それらが上記の特徴を与えたものと考えられる.
著者
古田島 洋介 前田 雅之
出版者
ジョルダン
雑誌
表現者
巻号頁・発行日
no.17, pp.76-102, 2008-03