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Atomic Absorption Spectroscopy: Interference01:25

Atomic Absorption Spectroscopy: Interference

810
Interference leads to systematic error in atomic absorption (AA) measurements by enhancing or diminishing the analytical signal or the background. These interferences can be grouped into three main categories: spectral interference, chemical interference, and physical interference.
Spectral interference occurs when signals from other elements or molecules overlap with the analyte signal, falsely elevating or masking the analyte's absorbance. This interference can be corrected using Zeeman,...
810

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Related Experiment Video

Updated: Jul 14, 2025

Thermal Ablation for the Treatment of Abdominal Tumors
07:16

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Aberration correction in abdominal histotripsy.

Ellen Yeats1, Timothy L Hall1

  • 1Department of Biomedical Engineering, University of MI, Ann Arbor, MI, USA.

International Journal of Hyperthermia : the Official Journal of European Society for Hyperthermic Oncology, North American Hyperthermia Group
|October 9, 2023
PubMed
Summary
This summary is machine-generated.

Phase aberration limits histotripsy by distorting ultrasound focus. Correcting this aberration is key to improving noninvasive tissue destruction therapies and expanding patient eligibility for histotripsy treatments.

Keywords:
Histotripsyaberration correctioncavitationfocusinghigh intensity focused ultrasoundphasephase correctionsoft tissuetherapeutic ultrasound

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Area of Science:

  • Medical physics
  • Biomedical engineering
  • Acoustic imaging

Background:

  • Transabdominal histotripsy uses focused ultrasound to noninvasively destroy soft tissues through cavitation.
  • Phase aberration, caused by tissue heterogeneity, degrades ultrasound focus, reducing histotripsy safety and efficacy.
  • Understanding aberration effects is crucial for advancing therapeutic ultrasound.

Purpose of the Study:

  • To review and discuss the impact of phase aberration on histotripsy and related ultrasound therapies.
  • To explore and compare different methods for correcting phase aberration in soft tissues.
  • To highlight the importance of aberration correction for enhancing histotripsy treatment outcomes.

Main Methods:

  • Review of existing literature on phase aberration in therapeutic ultrasound.
  • Classification of aberration correction methods into model-based and signal-based approaches.
  • Discussion of the advantages and disadvantages of each correction method.

Main Results:

  • Phase aberration shifts, broadens, and weakens the ultrasound focus, compromising histotripsy.
  • Model-based methods utilize tissue imaging and acoustic models for phase compensation.
  • Signal-based methods use therapy arrays to detect acoustic signals for phase correction.

Conclusions:

  • Model-based methods effectively correct focal shift, while signal-based methods restore focal pressure.
  • A combined 2-step approach using both methods is proposed for optimal aberration correction.
  • Aberration correction is critical for improving histotripsy safety, efficacy, and expanding its clinical applications.