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Optimization of Dose and Image Quality for Computed Radiography and Digital Radiography

机译：计算机射线照相和数字射线照相的剂量和图像质量的优化

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摘要

The surface doses to patients during chest, abdomen and pelvis radiography were measured over a period of 3 years, during which time computed radiography (CR) and digital radiography (DR) systems were introduced to replace film–screen systems. For film–screen and CR the surface doses were measured with thermoluminescent dosimeters. For DR the surface doses were calculated from the dose–area product (DAP) meter readings. Measurements were made for each type of examination and detector type on 10 average-size patients. Measurements were made immediately after the new systems were introduced, and subsequently as adjustments were made to optimize dose and image quality. Published diagnostic reference levels were used as target values in this optimization. Initially, CR doses were the same as or higher than for film–screen, and the doses were lower for DR compared to film–screen. Subsequent clinical experience with the systems led to changes in the technique used for chest examinations both for CR and for DR. For CR, it was possible to change the algorithm and decrease the dose to one quarter of the initial value with acceptable image quality. For DR, it was decided to reduce noise by increasing the dose by a factor of two. No changes were made to abdomen or pelvic imaging techniques for either CR or DR. The final patient surface doses using CR were similar to published diagnostic reference doses; for DR, all patient doses were less than published reference levels.
机译：在3年的时间内测量了胸部，腹部和骨盆X射线照相时对患者的表面剂量，在此期间，引入计算机X射线照相（CR）和数字X射线照相（DR）系统来代替胶片扫描系统。对于胶片屏幕和CR，表面剂量使用热发光剂量计进行测量。对于DR，表面剂量是根据剂量-面积乘积（DAP）仪表读数计算得出的。对10名平均大小的患者的每种检查类型和检测器类型进行了测量。引入新系统后立即进行测量，随后进行调整以优化剂量和图像质量。在此优化中，已发布的诊断参考水平用作目标值。最初，CR剂量等于或大于胶片屏幕，而DR的剂量低于胶片屏幕。该系统的后续临床经验导致用于CR和DR的胸部检查技术发生变化。对于CR，可以更改算法并将剂量降低到初始值的四分之一，并且图像质量可以接受。对于DR，决定通过将剂量增加两倍来减少噪音。 CR或DR的腹部或骨盆成像技术均未改变。使用CR的最终患者表面剂量与已公布的诊断参考剂量相似。对于DR，所有患者剂量均低于公布的参考水平。

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  • 来源
    《Journal of Digital Imaging》 |2006年第2期|126-131|共6页
  • 作者

    John E. Aldrich; Emerenciana Duran; Pat Dunlop; John R. Mayo;

  • 作者单位

    Department of Radiology Vancouver General Hospital and University of British Columbia 899 West 12th Avenue Vancouver BC Canada V5Z 1M9;

    Department of Occupational Health Vancouver General Hospital and University of British Columbia Vancouver BC Canada;

    Department of Radiology Vancouver General Hospital and University of British Columbia 899 West 12th Avenue Vancouver BC Canada V5Z 1M9;

    Department of Radiology Vancouver General Hospital and University of British Columbia 899 West 12th Avenue Vancouver BC Canada V5Z 1M9;

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  • 原文格式 PDF
  • 正文语种 eng
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  • 关键词

    Computed radiography; digital radiography; optimization; patient dose;

    机译：计算机射线照相;数字射线照相;优化;患者剂量;

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