巻号一覧
25 巻 (2008)
- 4 号 p. 70-
- 3 号 p. 37-
- 2 号 p. 22-
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25 巻, 3 号
選択された号の論文の6件中1～6を表示しています
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齋藤 哲史2008 年 25 巻 3 号 p. 37-39
発行日: 2008/07/01
公開日: 2008/10/03
ジャーナル フリー日本の医療体制は崩壊の瀬戸際にある, といっても過言ではありません. 政府による医療費抑制策が原因です. しかし, 医療費は本当に抑制し なければならないのでしょうか. 医療は, 健康・長寿を実現するのに必要なサービスです. また, 高齢化や所得水準の向上に伴って支出に占める割合が上昇するのは必然です . それは他の先進国の例からも明らかでしょう. それにもかかわらず, 政府は財政的見地から医療費抑制策を30 年近くも続けてきました. 現在の 状況は, その報いと言えるのかもしれません. 今回の講演では, 医療崩壊の経済学と題して, 「医療費抑制の是非」, 「後期高齢者医療制度」, 「将来の医療保険設計」の3 点について言及し ましたが, 内容を一部変更・省略しております. 何卒ご容赦ください.抄録全体を表示PDF形式でダウンロード (323K) -
木戸 尚治, 大賀 雄一2008 年 25 巻 3 号 p. 40-42
発行日: 2008/07/01
公開日: 2008/10/03
ジャーナル フリーThe subtracted images obtained from double arterial hepatic dynamic CT using multi-detector row CT(MDCT) are useful in detecting hepatic tumors which show subtle enhancement in the second phase. However, manual subtraction of MDCT images is time-consuming for radiologists. So, we have developed a fully automated dynamic subtraction algorithm of hepatic CT by use of 3D phase only correlation method for improvement of detection of hepatic tumors. Our algorithm was as follows. In the first step, global-matching processing was performed based on extracted bone regions. In the next step, local-matching processing was performed for the liver area. In the final step, subtraction processing was performed. We evaluated our algorithm using 12 clinical cases, and obtained promising results.抄録全体を表示PDF形式でダウンロード (518K) -
菅田 良博, 木戸 尚治, 庄野 逸2008 年 25 巻 3 号 p. 43-47
発行日: 2008/07/01
公開日: 2008/10/03
ジャーナル フリーFor the diagnosis of diffuse lung diseases on CT images, we have used two-dimensional(2D)images. Now, we can easily obtain minute volume data of human body by use of multi-detector row CT, and can diagnose diffuse lung diseases by use of three-dimensional(3D)images. In this study, we focused attention on the patterns of diffuse lung diseases, and tried the computerized analysis method for the image features of the three-dimensional CT images. And we compared the classification results obtained from 3D feature analysis with those obtained from 2D feature analysis. Image patterns for the computerized analysis are as follows: consolidation, ground-glass opacity, reticular, honeycomb, cyst, nodular and normal. In order to evaluate these patterns, we used several features of texture analysis obtained from Fourier power spectrum, gray-level histogram, difference statistics, co-occurrence matrix, and run length matrix.抄録全体を表示PDF形式でダウンロード (465K) -
李 鎔範, 蔡 篤儀, 鈴木 崇夫2008 年 25 巻 3 号 p. 48-53
発行日: 2008/07/01
公開日: 2008/10/03
ジャーナル フリーPre-processing is important for digital medical images because it can contribute to the improvement of diagnostic accuracy with medical images and computer-aided diagnosis. In this paper, a novel sigmoid-type transfer curve for wavelet coefficient weighting adjustment was proposed to improve contrast of medical images. The proposed method was applied to chest radiographs, mammograms and chest CT images, and then its performance was quantitatively evaluated with contrast improvement ratio. As a result, contrasts of all applied images were obviously improved. Compared with the conventional exponential-type transfer curve, the proposed sigmoid-type transfer curve was more effective with a statistical significance(p<0.05).抄録全体を表示PDF形式でダウンロード (735K) -
弦巻 正樹, 李 鎔範, 蔡 篤儀, 関谷 勝, 風間 清子2008 年 25 巻 3 号 p. 54-60
発行日: 2008/07/01
公開日: 2008/10/03
ジャーナル フリーManual determination of an oblique sagittal imaging plane with high accuracy in lumbar spine magnetic resonance imaging(MRI)needs time, experience and expertise. In this paper we present a simple and fast setting system for assisting MRI operators in their routine work to automatically and accurately determine oblique sagittal imaging plane in lumbar spine MRI. The algorithm of the presented method consists of three major steps:(1)extraction of torso region from coronal localizer image by use of histogram analysis,(2)extraction of lumbar vertebra and spinal canal regions by use of minimization and maximization filters as well as density accumulation analysis, and(3)determination of the desired position and angle of sagittal imaging plane using Hough transform. In order to evaluate the performance of our proposed method, positions and angles of the sagittal imaging planes determined by the presented method were evaluated by five radiological technologists. Thirty healthy volunteers participated in this study. All the 5 observers confirmed that the automatically determined imaging planes of all the 30 cases were acceptable for subsequent imaging procedures.抄録全体を表示PDF形式でダウンロード (889K) -
井上 聖, 大倉 保彦, 川下 郁生, 伊東 克能, 松永 尚文, 真田 泰三, 秋山 實利, 石田 隆行2008 年 25 巻 3 号 p. 61-69
発行日: 2008/07/01
公開日: 2008/10/03
ジャーナル フリーRecently, imaging techniques such as high magnetic field imaging and multidetector-row CT provides remarkable improvement in diagnosis. However, the latest imaging systems easily produce more than a thousand diagnostic images per patient. Image reading of a huge number of multi-modality images by use of a multi-formatted display and/or stack display method would be a hard work for radiologists. Therefore, we have developed a pixel-based comprehensive image processing method for the differential diagnosis of liver diseases by using multi-modality images. In this scheme, the criteria of an attendant radiologist for differential diagnosis for normal liver, cyst, hemangioma, hepatocellular carcinoma, and metastatic cancer on magnetic resonance images with various sequences and computed tomography images with and without contrast enhancement are employed. Total of 40 cases which including 10 cysts, 10 hemangiomas, 10 hepatocellular carcinomas, and 10 metastatic cancers are used in this study. The liver diseases could be correctly detected in all cases. The comprehensive image processing technique could assist radiologists for the differential diagnosis of the liver diseases.抄録全体を表示PDF形式でダウンロード (1053K)
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