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Related Concept Videos

¹H NMR: Interpreting Distorted and Overlapping Signals01:02

¹H NMR: Interpreting Distorted and Overlapping Signals

Spin systems where the difference in chemical shifts of the coupled nuclei is greater than ten times J are called first-order spin systems. These nuclei are weakly coupled, and their chemical shifts and coupling constant can generally be estimated from the well-separated signals in the spectrum.
As Δν decreases and the signals move closer, the doublets appear increasingly distorted. The intensities of the inner lines increase at the cost of those of the outer lines as the signals are slanted or...
Interpreting ¹H NMR Signal Splitting: The (n + 1) Rule01:10

Interpreting ¹H NMR Signal Splitting: The (n + 1) Rule

In the AX proton spin system, proton A can sense the two spin states of a coupled proton X, resulting in a doublet NMR signal with two peaks of equal (1:1) intensity. When proton A is coupled to two equivalent protons (AX2 spin system), the spin states of each X can be aligned with or against the external field, creating three possible scenarios. This results in a 1:2:1  triplet signal, where the central peak corresponds to the chemical shift of A and is twice as large or intense as the others.
Inductively Coupled Plasma Atomic Emission Spectroscopy: Instrumentation01:26

Inductively Coupled Plasma Atomic Emission Spectroscopy: Instrumentation

Inductively coupled plasma (ICP) is the common plasma source used in atomic emission spectroscopy (AES), a technique that detects and analyzes various elements in a sample. This method is often called inductively coupled plasma atomic emission spectroscopy (ICP-AES).
There are three main types of inductively coupled plasma atomic emission spectroscopy  (ICP-AES) instruments: sequential, simultaneous multichannel, and Fourier transform instruments, with the latter being less commonly used.
Tandem Mass Spectrometry01:21

Tandem Mass Spectrometry

Tandem mass spectrometry is a technique that uses multiple mass analyzers in series to obtain a higher selectivity and reduce chemical noise during analyte detection. Instruments with multiple analyzers separated by an interaction cell enable secondary fragmentation and selected study of the fragment ions.Secondary fragmentations occur in the interaction cell and can be induced by various factors. Fragmentation induced by collision with inert gases, such as N2, Ar, He, etc., is called...
Mass Analyzers: Common Types01:19

Mass Analyzers: Common Types

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...
NMR Spectrometers: Resolution and Error Correction01:14

NMR Spectrometers: Resolution and Error Correction

When magnetic nuclei in a sample achieve resonance and undergo relaxation, the signal detected in NMR is an approximately exponential free induction decay. Fourier transform of an exponential decay yields a Lorentzian peak in the frequency domain. Lorentzian peaks in an NMR spectrum are defined by their amplitude, full width at half maximum, and position, where the peak width is governed by the spin-spin relaxation time alone. In real experiments, however, the applied magnetic field is rendered...

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High Speed Sub-GHz Spectrometer for Brillouin Scattering Analysis
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High Speed Sub-GHz Spectrometer for Brillouin Scattering Analysis

Published on: December 22, 2015

Theoretical bounds and system design for multipinhole SPECT.

Peter Nillius1, Mats Danielsson

  • 1Department of Physics, Royal Institute of Technology (KTH), Albanova University Center, SE-106 91 Stockholm, Sweden. nillius@mi.physics.kth.se

IEEE Transactions on Medical Imaging
|April 10, 2010
PubMed
Summary

Optimizing multipinhole single photon emission computed tomography (SPECT) systems involves balancing resolution and sensitivity. This study provides a theoretical framework for designing optimal multipinhole SPECT configurations, achieving near-maximal sensitivity with realistic detector sizes.

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High Speed Sub-GHz Spectrometer for Brillouin Scattering Analysis
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A Photonic System for Generating Unconditional Polarization-Entangled Photons Based on Multiple Quantum Interference

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Area of Science:

  • Medical Imaging
  • Nuclear Medicine
  • Physics

Background:

  • Single photon emission computed tomography (SPECT) systems face a fundamental trade-off between image resolution and sensitivity.
  • Multipinhole designs offer improved performance over traditional single-pinhole SPECT.
  • Optimal design strategies for multipinhole SPECT are not fully established.

Purpose of the Study:

  • To theoretically analyze multipinhole SPECT geometry for optimal system construction.
  • To derive upper bounds for sensitivity based on resolution and field-of-view (FOV).
  • To develop a design strategy for multipinhole SPECT systems.

Main Methods:

  • Development of an analytic model to study multipinhole SPECT geometry.
  • Analysis of trade-offs between sensitivity, resolution, field-of-view, magnification, and number of pinholes.
  • Inclusion of pinhole knife-edge penetration effects using equivalent apertures.

Main Results:

  • Derivation of the theoretical upper bound for sensitivity in multipinhole SPECT.
  • Demonstration that near-maximal sensitivity (95%-99% of the upper bound) is achievable with realistic detector dimensions.
  • Identification of a key trade-off between sensitivity, magnification, and the number of pinholes.

Conclusions:

  • A theoretical framework for optimizing multipinhole SPECT system design has been established.
  • Near-optimal sensitivity can be achieved in practical multipinhole SPECT systems.
  • The derived design strategy facilitates the creation of improved multipinhole SPECT configurations.