Portal image verification is one of key QA procedures for implementation of accurate radiotherapy.
照射野验证是实施精确放射治疗质量保证(QA)的关键步骤之一。
The contrast and quality of portal image is so low that it is difficult to avoid errors in routine verification.
照射野影像对比度低、图像质量差使常规照射野验证易产生误差。
The contrast and quality of portal image is so low that it is difficult to avoid errors in routine verification.
照射野影像对比度低、图像质量差使常规照射野验证易产生误差。
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