Reduction of patient dose by using scattered x-rays

使用散射 X 射线减少患者剂量

基本信息

  • 批准号:
    05680418
  • 负责人:
  • 金额:
    $ 1.22万
  • 依托单位:
  • 依托单位国家:
    日本
  • 项目类别:
    Grant-in-Aid for General Scientific Research (C)
  • 财政年份:
    1993
  • 资助国家:
    日本
  • 起止时间:
    1993 至 1995
  • 项目状态:
    已结题

项目摘要

(1) Mesurement of scattered x-ray spectra impinged into the pixel of an image planeA conical collimator of the half angle 45゚ was placed in front of a Ge detector. Scatter spectrum was measured by decreasing the diameter of a beam stopper and extrapolated to zero diameter. Primary + Scatter spectrum was obtained by removing the beam stopper. The difference of the above two was the primary spectrum. Thus the separation of the primary and scatter spectra of x-rays impinged into a pixel of an image plane was performed.(2) Calculation of x-ray spectra emitted from an x-ray tubeThe fluctuation of electron energy in the x-ray tube anode was calculated by Monte Carlo method and obtained the Bremsstrahlung crossections by using the quantum theoretical formulas. The results terminated the controversy between Birch and Tucker. We proposed a new theoretical model for characteristic x-ray spectra from tungsten anode.(3) Calculation of scattered x-ray spectra impinged into the imaging planeScattered spectra calculated by using Monte Carlo method were coincided well with the measured spectra. Bucky factors and contrast improvement factors were obtained by the results of the scattered x-ray spectra calculated for various grid ratios and irradiation field sizes. By using these results, it becomes available to select the optimum grid balancing high image quality and low patient dose.(4) Relation between scatter fraction, image contrast and patient doseWe obtained the scatter fraction by the procedures of (1) and (3) , and took radiographs of an aluminum square-wave chart images for various scatter fractions. We proposed the contrast-dose diagram which indicated the relation between image contrast and patient dose for various scatter fractions. By using this diagram we can find the optimum scatter fraction for minimum dose. This method was applied in a clinical radiograph for Sella Turcica in a head phantom.
(1)测量撞击图像平面像素的散射X射线光谱将一个顶角为45 °的圆锥形准直器放置在Ge探测器前面。通过减小光束阻挡器的直径并外推到零直径来测量散射谱。通过移除光束阻挡器获得初级+散射光谱。两者的差异是主要的光谱。因此,执行撞击到图像平面的像素中的X射线的初级光谱和散射光谱的分离。(2)X射线管发射X射线能谱的计算用MonteCarlo方法计算了X射线管阳极中电子能量的涨落,并利用量子理论公式得到了X射线管的韧致辐射截面。这一结果结束了伯奇和塔克之间的争论。提出了一种新的钨阳极特征X射线谱的理论模型。(3)用蒙特卡罗方法计算的X射线散射能谱与实测能谱符合较好。通过计算不同网格比和照射野尺寸的散射X射线谱的结果,获得了巴基因子和对比度改善因子。通过使用这些结果,可以选择平衡高图像质量和低患者剂量的最佳滤线栅。(4)散射分数、图像对比度和患者剂量之间的关系我们通过(1)和(3)的过程获得散射分数,并拍摄铝方波图表图像的各种散射分数的X线照片。我们提出了对比度剂量图,它表明了图像对比度和患者剂量之间的关系,为各种散射分数。通过使用该图,我们可以找到最小剂量的最佳散射分数。将该方法应用于头部体模中的蝶鞍临床X线摄影。

项目成果

期刊论文数量(64)
专著数量(0)
科研奖励数量(0)
会议论文数量(0)
专利数量(0)
N.Nakamori, K.Yamano, M.Yamada and H.Kanamori: "Calculation of characteristic x-rays in diagnostic x-ray spectrum" Japanese Journal of Applied Physics. 33 (Part1-1A). 347-352 (1994)
N.Nakamori、K.Yamano、M.Yamada 和 H.Kanamori:“诊断 X 射线光谱中特征 X 射线的计算”日本应用物理学杂志。
  • DOI:
  • 发表时间:
  • 期刊:
  • 影响因子:
    0
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  • 通讯作者:
Atsushi Takigawa: "An example of the application of the contrast-dose diagram to medical radiographs" Journal of Photographic Science. 43. 95-98 (1995)
Atsushi Takikawa:“对比剂量图在医学放射线照片中的应用示例”《摄影科学杂志》。
  • DOI:
  • 发表时间:
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    0
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  • 通讯作者:
Atsushi Takigawa: "Measurement of scattered x-ray spectrum for the evaluation of radiographic contrast" Journal of Photographic Science. 44. 31-34 (1996)
Atsushi Takikawa:“用于评估射线照相对比度的散射 X 射线光谱的测量”摄影科学杂志。
  • DOI:
  • 发表时间:
  • 期刊:
  • 影响因子:
    0
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  • 通讯作者:
有村秀孝: "X-ray tube voltage dependence of Rossmann's three factors in Wiener Spectra" SPLE Proceedings. 2163. 42-53 (1994)
Hidetaka Arimura:“维纳光谱中罗斯曼三因素的 X 射线管电压依赖性”SPLE 论文集。 2163. 42-53 (1994)。
  • DOI:
  • 发表时间:
  • 期刊:
  • 影响因子:
    0
  • 作者:
  • 通讯作者:
H.Kubota, Y.Ozaki, M.Matsumoto and H.Kanamori: "Determination of x-ray tube focal spot positions" Medical Physics. 20. 1029-1031 (1993)
H.Kubota、Y.Ozaki、M.Matsumoto 和 H.Kanamori:“X 射线管焦点位置的确定”医学物理学。
  • DOI:
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    0
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KANAMORI Hitoshi其他文献

KANAMORI Hitoshi的其他文献

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{{ truncateString('KANAMORI Hitoshi', 18)}}的其他基金

Development of medical x-ray imaging system using semiconductor array for reduction of patient dose
开发使用半导体阵列的医用 X 射线成像系统以减少患者剂量
  • 批准号:
    10557239
  • 财政年份:
    1998
  • 资助金额:
    $ 1.22万
  • 项目类别:
    Grant-in-Aid for Scientific Research (B).
Reduction of patient dose at medical x-ray diagnosis using scattered x rays.
使用散射 X 射线减少医疗 X 射线诊断中患者的剂量。
  • 批准号:
    08680524
  • 财政年份:
    1996
  • 资助金额:
    $ 1.22万
  • 项目类别:
    Grant-in-Aid for Scientific Research (C)
Development of medical x-ray imaging system using semiconductor array for reduction of patient dose
开发使用半导体阵列的医用 X 射线成像系统以减少患者剂量
  • 批准号:
    08557140
  • 财政年份:
    1996
  • 资助金额:
    $ 1.22万
  • 项目类别:
    Grant-in-Aid for Scientific Research (A)
Development of the semiconductor array type diagnostic x-ray imaging device for the purpose of the reduction of patient dose
开发半导体阵列型诊断X射线成像装置以减少患者剂量
  • 批准号:
    05557114
  • 财政年份:
    1993
  • 资助金额:
    $ 1.22万
  • 项目类别:
    Grant-in-Aid for Developmental Scientific Research (B)
Active utilization of scatter for reducing patient dose in x-ray diagnosis
X射线诊断中积极利用散射减少患者剂量
  • 批准号:
    02680184
  • 财政年份:
    1990
  • 资助金额:
    $ 1.22万
  • 项目类别:
    Grant-in-Aid for General Scientific Research (C)
Patient Exposure and Image Quality in Medical X-ray Imaging Including Scatter
医学 X 射线成像(包括散射)中的患者曝光和图像质量
  • 批准号:
    62580182
  • 财政年份:
    1987
  • 资助金额:
    $ 1.22万
  • 项目类别:
    Grant-in-Aid for General Scientific Research (C)
Patient Exposure and Image Quality in Medical X-ray Imaging
医学 X 射线成像中的患者曝光和图像质量
  • 批准号:
    60580182
  • 财政年份:
    1985
  • 资助金额:
    $ 1.22万
  • 项目类别:
    Grant-in-Aid for General Scientific Research (C)

相似海外基金

Effects of scattered X-rays on diagnostic X-ray images
散射 X 射线对诊断 X 射线图像的影响
  • 批准号:
    12650058
  • 财政年份:
    2000
  • 资助金额:
    $ 1.22万
  • 项目类别:
    Grant-in-Aid for Scientific Research (C)
Reduction of patient dose at medical x-ray diagnosis using scattered x rays.
使用散射 X 射线减少医疗 X 射线诊断中患者的剂量。
  • 批准号:
    08680524
  • 财政年份:
    1996
  • 资助金额:
    $ 1.22万
  • 项目类别:
    Grant-in-Aid for Scientific Research (C)
Effects of scattered x rays upon radiographs used for computer-and diagnosis
散射 X 射线对用于计算机和诊断的放射线照片的影响
  • 批准号:
    08650072
  • 财政年份:
    1996
  • 资助金额:
    $ 1.22万
  • 项目类别:
    Grant-in-Aid for Scientific Research (C)
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