Japanese
Titleシンチカメラ像の電子計算機処理について
Subtitle原著
Authors河内清光*, 小山田日吉丸**, 広瀬康二**, 藤井正敏**, 石橋弘義**
Authors(kana)
Organization国立ガンセンター, *放射線研究部, **放射線診療部
Journal核医学
Volume9
Number2
Page128-135
Year/Month1972/4
Article原著
Publisher日本核医学会
Abstract「I. はじめに」最近, 日常の臨床レベルでのシンチカメラの普及は目覚しいものがある, これは検出器が固定されていて, 静的画像のみならず, 動的画像も視覚的に追求でき, さらに任意の方向からの画像描出が可能であることによるものと思われる. また, 最近の電子計算機の発達はシンチカメラ自体に附属した小型電子計算機で, ある程度の計算処理を施した後, より見易い画像を表示することも臨床レベルでだんだん可能になってきている. しかしながら, 画像の中の微小な変化を有意に抽出するためには, 画一的な処理では無理な場合もあり, 融通性に豊んだプログラムと大型電子計算機の利用を必要とする場合もある. 我々は, シンチカメラの画像処理法と言うものは, 既に確立されたものでなく, まだ手を加えるべき点も残されていると考えている. たとえば, 平滑化と強調は既に数多くの人が試み, 平滑化に関しては, 殆んどの人が前処理として, また単独の処理としてもその有効性を認めている.
Practice臨床医学：一般
Keywords
English
TitleThe Computer Processing on The Scintillation Camera Images
Subtitle
AuthorsKiyomitsu KAWACHI, Hiyoshimaru OYAMADA, Kouji HIROSO, Masatoshi FUJII, Hiroyoshi ISHIBASHI
Authors(kana)
OrganizationNational Cancer Center
JournalThe Japanese Journal of nuclear medicine
Volume9
Number2
Page128-135
Year/Month1972/4
ArticleOriginal article
PublisherTHE JAPANESE SOCIETY OF NUCLEAR MEDICINE
Abstract[Summary] Nowadays, the images obtained from the scintillation camera have become the subject for the further digital computer processing, such as smoothing and contrast enhancement etc. In our radioisotope laboratory, there is a scintillation camera (Nuclear Chicago Pho/Gamma III) with 1600 channel pulse height analyzer, through which digital data can be obtained, However, no further equipments for the computer processing, such sa magnetic tape or even tape puncher, are available at present and the digital data are necessary to be punched on the punch cards manually, which are then trans-fered to the computer (HITAC 8300) installed in the admini-stration office at our hospital. To get better visualization of the scintillation camera images than the original ones we are using fundamentally similar techniques as other workers have used ; for example, 9 points smoothing and contrast enhancement by iteration method of two or three times. However, cold areas or areas of significant difference of counts are usually located in various count level and the application of the iteration method covering all the count levels at one time is sometimes not enough to visualize these areas. From our studies it was found that the window setting technique, which provides the upper and lower count levels and performs contrast enhancement on the counts between these levels, clearly demonstrated the detailed structures of the area of interest. These levels are approdriately moved until it is found that the level is adepuate. It is kown also that the subtraction method on the data odtained from two different nuclides are sometimes useful, especially to visualize the pancreas. In our studies, besides the above subtraction method, we tried to divide the data of 75Se-selenomethionine by the data of 198Au-colloid and successfully visualized the pancreas area with better contrast. We consider that the above-mentioned window setting method as well as dividing method on the data from two different nuclides are worthwhile to be tried.
PracticeClinical medicine
Keywords

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