Article

Quality of portal verification images using GLP7 film.

Department of Radiology, Osaka-Prefectural Habikino Hospital, Japan.
Academic Radiology (impact factor: 1.69). 11/1995; 2(10):859-63. DOI:10.1016/S1076-6332(05)80061-3 pp.859-63
Source: PubMed

ABSTRACT To improve portal verification radiographs, we tested the application of GLP7 film.
The quality of the portal verification radiograph using the XV cassette-GLP7 film combination and the XL cassette-GLP7 film combination was investigated. The XV cassette-XV2 film combination and the SA cassette-GS screen-XTL film combination also were used for comparison.
The characteristic curves showed that the relative speeds were 0.32 and 0.47 for the XV-GLP7 and XL-GLP7 combinations and that the average gradients were 1.93, 2.14, and 1.32 for the XV-GLP7, XL-GLP7, and XV-XV2 combinations, respectively. In the experiment using Burger's phantom, the smallest visible volumes were 11.8, 11.3, 28.7, and 19.6 mm3 for the XV-GLP7, XL-GLP7, XV-XV2, and SA-GS-XTL combinations, respectively. In the lower dosage treatment in the clinic, there were no marked differences between the GLP7 film and XV2 film. However, in the higher dosage treatment, the GLP7 film had a better quality than did the XV2 film.
Portal verification radiographs using GLP7 film are of sufficient quality for clinical use.

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    Hideki Fujita, Michihiro Yamaguchi, Toshizo Katsuda, Hisashi SAKAMOTO, Tomio Fujioka, Masami AZUMA, ヒデキ フジタ, ミチヒロ ヤマグチ, トシゾウ カツダ, ヒサシ サカモト, トミオ フジオカ, マサミ アズマ, 秀樹 藤田, 道弘 山口, 稔三 勝田, 久 阪本, 富雄 藤岡, 眞美 東
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    ABSTRACT: The purpose of this study was to develop a convenient method to acquire the verification image in high-energy electron beam therapy. The verification image is important to confirm the treatment field in comparison with the simulation image acquired by treatment planning or the portal-localization image before the treatment is started. Then, the acquisition of verification images was attempted utilizing the computed radiography (CR) system and bremsstrahlung X-rays generated by the irradiation of high-energy electron beams. In the experiment using phantom, verification images were acquired and appeared to be clinically useful at all nominal energies and two kinds of target dose. The cases applied to the clinical examination were useful for verification images. 本論文の目的は, 高エネルギー電子線治療における照合画像の取得を検討することである。照合画像は, 治療計画で得られる位置決め画像または治療開始前の照準画像と対応させて照準野の確認を行う上で重要である。そこで, 高エネルギー電子線の照準時に発生する制動X線とComputed Radiography (CR) システムを利用して照合画像の取得を試みた。ファントム実験の結果, すべてのエネルギーおよび標的線量において臨床適応可能と思われる照合画像が得られた。臨床応用例でも, 4症例すべて臨床的に有用であった。今回利用したCRシステムは, すべて診断X線用のシステムであり, 特殊な装置も必要なく日常的に照合画像の取得に有効であり, 高エネルギー電子線治療の「質の保証」(Quality Assurance; QA)に役立つと考えられる。
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Keywords

average gradients
 
Burger's phantom
 
characteristic curves
 
clinical use
 
GLP7 film
 
higher dosage treatment
 
lower dosage treatment
 
portal verification radiograph
 
portal verification radiographs
 
relative speeds
 
SA cassette-GS screen-XTL film combination
 
sufficient quality
 
XL cassette-GLP7 film combination
 
XV cassette-GLP7 film combination
 
XV cassette-XV2 film combination
 
XV-GLP7
 
XV-XV2
 
XV-XV2 combinations
 
XV2 film
 

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