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Optimal steel thickness combined with computed radiography for portal imaging of nasopharyngeal cancer patients
Author(s) -
Wu Shixiu,
Jin Xiance,
Xie Congying,
Cao Guoquan
Publication year - 2005
Publication title -
medical physics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.473
H-Index - 180
eISSN - 2473-4209
pISSN - 0094-2405
DOI - 10.1118/1.2042267
Subject(s) - computed radiography , optical transfer function , image quality , radiography , materials science , optics , contrast (vision) , biomedical engineering , nuclear medicine , radiology , medicine , image (mathematics) , computer science , computer vision , physics
The poor image quality of conventional metal screen‐film portal imaging system has long been of concern, and various methods have been investigated in an attempt to enhance the quality of portal images. Computed radiography (CR) used in combination with a steel plate displays image enhancement. The optimal thickness of the steel plate had been studied by measuring the modulation transfer function (MTF) characteristics. Portal images of nasopharyngeal carcinoma patients were taken by both a conventional metal screen‐film system and this optimal steel and CR plate combination system. Compared with a conventional metal screen‐film system, the CR‐metal screen system achieves a much higher image contrast. The measured modulation transfer function (MTF) of the CR combination is greater than conventional film‐screen portal imaging systems and also results in superior image performance, as demonstrated by receiver operator characteristic (ROC) analysis. This optimal combination steel CR plate portal imaging system is capable of producing high contrast portal images conveniently.