巻号一覧
28 巻 (2011)
- 4 号 p. 87-
- 3 号 p. 57-
- 2 号 p. 36-
- 1 号 p. 1-
28 巻, 2 号
選択された号の論文の4件中1～4を表示しています
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特別講演資料
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桂川 茂彦2011 年 28 巻 2 号 p. 36-40
発行日: 2011年
公開日: 2011/06/22
ジャーナル フリーIn this review article, computer-aided diagnosis schemes developed at Kumamoto University for volume data images such as CT and MR images are presented with a description of the overall schemes of computer algorithms. The CAD schemes in this article include the detection of interval changes in CT images by using a temporal subtraction method, the detection of acute cerebral infarction on CT images, the automated segmentation of the gross tumor volume of a glioblastoma multiforme on brain MR images for radiotherapy planning, and also the automated segmentation technique for constructing three dimensional brain surface MR images.抄録全体を表示PDF形式でダウンロード (1317K)
論文
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木元 愛, 山口 弘次郎, 杉本 豪視, 田中 栄治, 鈴木 昇一2011 年 28 巻 2 号 p. 41-45
発行日: 2011年
公開日: 2011/06/22
ジャーナル フリーThe recent increase in the incidence of SAR and fever contracted during medical examinations has raised concerns about transmission from the WB coil used during magnetic resonance imaging(MRI)using SENSE. We measured changes in temperature at the body surface during MRI medical examinations using T2 Fast Spin Echo(T2FSE)and Hahn T2 Fast Spin Echo(Hahn-T2FSE). We initially calibrated the thermometer in an incubator and confirmed that it operated normally in a high magnetic field and that it was not damaged or influenced by heat generated by RF pulses. All experiments were performed using an Excel ART Pianissimo 1.0T(Toshiba Medical Systems)and Thermo clone SL type(KN Laboratories). The temperature at the body surface changed according to the measurement point. The temperature increase was lower when measured with Hahn-T2FSE than with T2FSE. One limitation of this study was that temperature was measured only during 1.0 T MRI.抄録全体を表示PDF形式でダウンロード (1498K) -
大川 貴志, 佐川 盛久, 早川 吉彦2011 年 28 巻 2 号 p. 46-50
発行日: 2011年
公開日: 2011/06/22
ジャーナル フリーThree-dimensional(3D)virtual space is recognized by some ubiquitous devices(controllers)in the world of computer games. Wii® Remote(Nintendo, Japan)is the controller of Wii®, and some sensors and interfaces are installed. 3D acceleration sensor enables to work as a 3D positional sensor. Our trial is to develop a 3D medical graphic viewer using a game-input-device, Wii Remote.
The 3D acceleration sensor can recognize 3D virtual space preciously and permit the intuitive operation. The programming language for a medical graphic viewer development was C#. We used the OpenSource Project, Wiimotelib 1.7, for C++/C#. 3D virtual place was created by XNA GameStudio 3.1(Microsoft). Our development included the rotation, parallel displacement/shift/translation, scaling(expansion/reduction)of 3D objects, and various light-source settings.
As results, the 3D object was rotated using three axes of the 3D acceleration sensor and enlarged or reduced using Wii Remote's Up and Down buttons. Also the 3D object showed the parallel translation using the cross-joint button while a trigger button B pressed. A medical graphic viewer was developed using a game-input-device, Wii Remote. Various operations are demonstrated. Such intuitive operation shows potentials as a medical graphic viewer.抄録全体を表示PDF形式でダウンロード (3662K) -
渡部 晴之, 蔡 篤儀, 李 鎔範, 松山 江里, 小島 克之2011 年 28 巻 2 号 p. 51-56
発行日: 2011年
公開日: 2011/06/22
ジャーナル フリーIn this paper, we investigate the effect of the use of wavelet transform for image processing on radiation dose reduction in computed radiography(CR), by measuring various physical characteristics of the wavelet-transformed images. Moreover, we propose a wavelet-based method for offering a possibility to reduce radiation dose while maintaining a clinically acceptable image quality. The proposed method integrates the advantages of two previously proposed techniques, i.e., sigmoid-type transfer curve for wavelet coefficient weighting adjustment technique, as well as a wavelet soft-thresholding technique. The former can improve contrast and spatial resolution of CR images, the latter is able to decrease image noise. In the investigation of physical characteristics, we measured and compared the modulation transfer function, noise power spectrum, and contrast-to-noise ratio of CR images obtained by the proposed method and other different methods. Furthermore, visual evaluation was performed using Scheffe's pair comparison method. Experimental results showed that the proposed method could improve overall image quality as compared to other methods. Our visual evaluation showed that an approximately 40% reduction in exposure dose might be achieved in hip joint radiography by using the proposed method.抄録全体を表示PDF形式でダウンロード (1474K)
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