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Related Concept Videos

Atomic Emission Spectroscopy: Overview01:20

Atomic Emission Spectroscopy: Overview

Atomic emission spectroscopy (AES) is an analytical technique used to determine the elemental composition of a sample by analyzing the light emitted from excited atoms. In AES, atoms in a sample are excited to higher energy levels by thermal energy from high-temperature sources, such as plasma, arcs, or sparks. When these excited atoms return to lower energy states, they emit light at specific wavelengths characteristic of each element. The resulting atomic emission spectrum, which consists of...
Emission Spectra02:39

Emission Spectra

When solids, liquids, or condensed gases are heated sufficiently, they radiate some of the excess energy as light. Photons produced in this manner have a range of energies, and thereby produce a continuous spectrum in which an unbroken series of wavelengths is present.
Atomic Emission Spectroscopy: Interference01:30

Atomic Emission Spectroscopy: Interference

In atomic emission spectroscopy (AES), high-temperature atomizers excite a broad range of elements and molecules that generate complex emissions from sources such as oxides, hydroxides, and flame combustion products in the flame or plasma. Several strategies can be employed to minimize spectral interferences caused by overlapping emission lines or bands. These include increasing instrument resolution, choosing alternative emission lines, optimally placing the detector in low-background regions,...
Atomic Emission Spectroscopy: Lab01:29

Atomic Emission Spectroscopy: Lab

AES is a powerful analytical technique, especially effective when used with plasma sources, producing abundant spectra in characteristic emission lines. The Inductively Coupled Plasma (ICP), in particular, yields superior quantitative analytical data due to its high stability, low noise, low background, and minimal interferences under optimal experimental conditions. However, newer air-operated microwave sources are emerging as promising alternatives that could be more cost-effective than...
Spectrophotometry: Introduction01:16

Spectrophotometry: Introduction

Spectrophotometry is the quantitative measurement of the absorption, reflection, diffraction, or transmission of electromagnetic radiation through a material as a function of the intensity and wavelength of the radiation. A spectrophotometer is a device used to measure the change in the radiation intensity caused by its interaction with the material.
The essential components of a spectrophotometer include a source of electromagnetic radiation, a slot for placing a material to be analyzed, and a...
Atomic Emission Spectroscopy: Instrumentation01:22

Atomic Emission Spectroscopy: Instrumentation

The instrumentation of atomic emission spectrometry (AES) involves various components, including atomization devices that convert samples into gas-phase atoms and ions. There are two main types of atomization devices: continuous and discrete atomizers.  Continuous atomizers, like plasmas and flames, introduce samples in a constant stream, while discrete atomizers inject individual samples using syringes or autosamplers. The most common discrete atomizer is the electrothermal atomizer.

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Quantifying X-Ray Fluorescence Data Using MAPS
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Published on: February 17, 2018

Attenuation map estimation with SPECT emission data only.

Yan Yan1, Gengsheng Lawrence Zeng

  • 1Department of Physics, University of Utah, Salt Lake City, Utah, 84108, USA.

International Journal of Imaging Systems and Technology
|February 12, 2010
PubMed
Summary
This summary is machine-generated.

This study introduces a novel method to estimate attenuation maps directly from emission data in quantitative SPECT imaging. This approach simplifies the process by avoiding transmission scans, improving accuracy in SPECT reconstruction.

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Area of Science:

  • Medical Imaging
  • Nuclear Medicine
  • Image Reconstruction

Background:

  • Quantitative single-photon emission computed tomography (SPECT) requires accurate compensation for photon attenuation.
  • Transmission scans are commonly used to generate attenuation maps but add complexity and scan time.
  • Obtaining attenuation information directly from emission data would significantly simplify quantitative SPECT.

Purpose of the Study:

  • To propose and evaluate a new method for estimating the attenuation map using only emission data in SPECT.
  • To leverage data consistency conditions of the attenuated Radon transform for attenuation map estimation.
  • To simplify the process of quantitative SPECT by eliminating the need for separate transmission scans.

Main Methods:

  • Developed an iterative algorithm to derive boundaries of constant regions within the true attenuation map.
  • Utilized data consistency conditions inherent to the attenuated Radon transform.
  • Tested the proposed method using Monte Carlo simulations incorporating attenuation and scattering effects.

Main Results:

  • The proposed method successfully estimates the attenuation map from emission data.
  • The iterative algorithm effectively identifies boundaries of homogeneous regions in the attenuation map.
  • Simulations demonstrated the feasibility of the method under realistic attenuation and scattering conditions.

Conclusions:

  • A novel, simplified method for attenuation map estimation in SPECT using emission data has been developed.
  • This technique holds potential to streamline quantitative SPECT protocols by removing the need for transmission scans.
  • Further validation in clinical settings is warranted to confirm its utility in improving SPECT accuracy.