巻号一覧
9 巻 (1992)
- 3 号 p. 101-
- 2 号 p. 53-
- 1 号 p. 1-
9 巻, 3 号
選択された号の論文の5件中1～5を表示しています
- |<
- <
- 1
- >
- >|
-
Kiyonari INAMURA, Tokuo UMEDA, Hajime HARAUCHI, Katsumi SATO, Kazuo IN ...1992 年 9 巻 3 号 p. 101-109
発行日: 1992年
公開日: 2012/08/27
ジャーナル フリーOutline of recent activities of research and development in the field of medical image information system is reported. The results of our activity are listed in references (1)-(30). Repertory of our activities is extended from medical image processing to PACS development, PACS for radiotherapy, diagnostic reporting system, image perception practice and database construction for radiation oncology.
Feature of our R&D is medical application of existed technology factors, rather than basic research. Cooperation with School of Medicine and Faculty of Engineering of Osaka University are deployed recently for clinical application of technologies and physics at large. As an example of our recent activities, design and development of PACS for Osaka University Hospital is described. Also importance and significance of technology assessment is stated.抄録全体を表示PDF形式でダウンロード (2117K) -
稲本 一夫1992 年 9 巻 3 号 p. 110-118
発行日: 1992年
公開日: 2012/08/27
ジャーナル フリー1)胃X線画像をデジタル化し,コンピュータ画像処理による画像強調を胃癌症例で行い,その効果を評価した.
2)CCD-TVカメラで,X線像をリアルタイムで入力し,512×512×8ビットのデジタル画像とし. パソコンに直結した画像処理装置のソフトウェアで処理した.
3)画像処理は濃度変換,ヒストグラム平墟化フィルタリング(ゾーベル法),高周波領域強調(ボケマスク処理)を試み, 特にゾーベル法と高周波領域強調を基本的処理と位置づけた.
4)胃癌22例の追跡研究で,その発生形態からみて4型に分類した.
5)胃X線画像の画像処理には高精細画像は必ずしも必要ではなく,手軽にパソコンレベルで行えることが望ましい.
6)コンピュータを用いた画像処理を放尉線科医が胃X線像を読影する際に利用すれば,よき診断支援となりうることがわかった.抄録全体を表示PDF形式でダウンロード (4280K) -
千田 浩一, 有馬 宏寧1992 年 9 巻 3 号 p. 119-125
発行日: 1992年
公開日: 2012/08/27
ジャーナル フリーFor the evaluation of tube voltage waveforms, the tube voltage ripple and tube voltage peak number have been used. However, for high frequency waveforms of tube voltage such as those of an inverter type X-ray generator, ripple and peak number are insufficient. Then, we suggest the frequency analysis method of tube voltage waveforms. In this method, waveforms are analyzed by using fast Fourier transform (FFT). The method is convenient to the assessment of distortion and frequency of tube voltage waveforms, especially useful for the detailed evaluation of an inverter type X-ray generator. We also measured the overall value of power spectra by using FFT analysis, and there is a good possibility that it is useful for the evaluation of X-ray beam quality.抄録全体を表示PDF形式でダウンロード (988K) -
小島 克之, 蔡 篤儀, 田中 嘉津夫, 内田 勝1992 年 9 巻 3 号 p. 126-133
発行日: 1992年
公開日: 2012/08/27
ジャーナル フリーWe performed the Coltman's correction by computer simulation and investigated the number of terms should be used for correction as well as the computation error. In the range of up to 100correction terms, we examined the difference between two computation methods, i. e., single precision and double precision, and compared the calculated results obtained with and without an arithmetic operation processor, also, order of addition operation. We found that the obtained MTF values at zero spatial frequency are similar. Therefore we may conclude that no error due to various computation methods occurs. Moreover, the calculated MTF values at zero spatial frequency are the closest to unity when 58 terms,60 terms, and 62 terms are used. And the corrected results obtained using 58 terms and 62 terms showed no significant difference. Thus we may state that 58 terms are sufficient for correction.抄録全体を表示PDF形式でダウンロード (790K) -
電子のエネルギー損失のバラツキとしてGauss分布およびLandau分布を用いたときの比較中森 伸行, 山野 要, 山田 正良, 金森 仁志1992 年 9 巻 3 号 p. 134-143
発行日: 1992年
公開日: 2012/08/27
ジャーナル フリーThe bremsstrahlung spectrum from a thick tungsten target is calculated using Monte Carlo method, taking into account energy-loss straggling of electrons in the target. Landau distribution and Gaussian distribution are applied to energy-loss straggling of electrons. The calculated spectra using Landau distribution are in good agreement with Birch-Marshall data of bremsstrahlung spectra, without any modification on the Bethe-Heitler cross section with an empirical correction factor discussed by Koch and Motz.抄録全体を表示PDF形式でダウンロード (1373K)
- |<
- <
- 1
- >
- >|