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Difference from Background: Limit of Detection01:05

Difference from Background: Limit of Detection

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The limit of detection (LOD) is the smallest amount of analyte that can be distinguished from the background noise. The LOD value corresponds to the concentration at which the analyte signal is three times larger than the standard deviation of the blank signal. Below this value, the analyte signal cannot be differentiated from the background noise. It is calculated by dividing the calibration slope by 3 times the standard deviation of the blank signals.
The LOD indicates the presence or absence...
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The mass analyzer is a crucial component of the mass spectrometer. In the ionization chamber, the vaporized sample is bombarded with a high-energy electron beam to generate a radical cation and further fragment into neutral molecules, radicals, and cations. A series of negatively charged accelerator plates accelerate the cations into the mass analyzer. The mass analyzer separates ions according to their mass-to-charge (m/z) ratios and then directs them to the detector. The common types of mass...
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The quadrupole mass analyzer consists of four cylindrical metal rods arranged in a diamond carrying a DC voltage and a radio-frequency AC voltage. The motion of ions through the quadrupole depends on the field strength, causing only ions of a certain m/z to resonate successfully and strike the detector at a given field strength. Though the transmission rate for these analyzers is high, the exact elemental composition of the sample is not determined because of low resolution; however, they are...
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Detectors in gas chromatography (GC) help identify and quantify the components of a mixture by translating chemical properties into measurable signals, which are displayed on a chromatogram. Detectors can be categorized into two main types: destructive and non-destructive.
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三重追踪器哨兵节点映射:最大限度地检测,最大限度地减少剖析.

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  • 1Faculty of General Medicine, Carol Davila University, 050474 Bucharest, Romania.

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概括
此摘要是机器生成的。

技术-99m和绿是乳腺癌中哨兵淋巴结活检的有效标记物,表现优于甲蓝. 三重追踪方法提高了检测,并可以减少删除的节点数量.

关键词:
乳腺癌 乳腺癌 乳腺癌印度氨酸绿色的绿色淋巴细胞映射绘制哨兵淋巴结活组织检查三重追踪技术的使用

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科学领域:

  • 在瘤学瘤学.
  • 手术瘤学手术瘤学
  • 核医学是一种核医学.

背景情况:

  • 哨兵淋巴结 (SLN) 活检对于乳腺癌的分期至关重要.
  • 通常使用的标记物包括技术-99m (99mTc),绿 (ICG) 和甲蓝 (MB).
  • 关于在常规临床实践中这些标记物的比较性能的数据有限.

研究的目的:

  • 审核99mTc,ICG和MB在乳腺癌中SLN活检的三重追踪方法中的性能.
  • 为了评估哨兵淋巴结检测率,检索的节点数量和追踪器一致性.
  • 评估子组的表现,包括接受乳房切除术或后新辅助治疗的患者.

主要方法:

  • 一个单一中心对111个连续的SLN程序进行了追溯审计.
  • 使用了结合99mTc,ICG和MB的三重追踪方法.
  • 评估检测率,节点收益率,追踪器一致性和特定患者子组.

主要成果:

  • 99mTc的检测率为96.4%,ICG为93.7%,MB的检测率为78.4%.
  • 99mTc和ICG显著超过了MB的表现 (p < 0.001).
  • 三重追踪器工作流改善了检测几率 (99mTc的AUC为0.98,ICG为0.82).

结论:

  • 技术仍然是SLN活检的主要标记物.
  • ICG是一个有价值的辅助,增强可视化和检测效率.
  • MB提供了冗余性;三重追踪器映射提供了最佳的节点识别,并可能减少完全一致的切除.