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Related Concept Videos

Phase Contrast and Differential Interference Contrast Microscopy01:26

Phase Contrast and Differential Interference Contrast Microscopy

Phase-Contrast Microscopes
In-phase-contrast microscopes, interference between light directly passing through a cell and light refracted by cellular components is used to create high-contrast, high-resolution images without staining. It is the oldest and simplest type of microscope that creates an image by altering the wavelengths of light rays passing through the specimen. Altered wavelength paths are created using an annular stop in the condenser. The annular stop produces a hollow cone of...
Time and frequency -Domain Interpretation of Phase-lag Control01:21

Time and frequency -Domain Interpretation of Phase-lag Control

Phase-lag controllers are widely used in control systems to improve stability and reduce steady-state errors. A dimmer switch controlling the brightness of a light bulb serves as a practical example of phase-lag control, gradually adjusting the bulb's brightness. Mathematically, phase-lag control or low-pass filtering is represented when the factor 'a' is less than 1.
Phase-lag controllers do not place a pole at zero, but instead influence the steady-state error by amplifying any finite,...
Frequency Response of a Circuit01:20

Frequency Response of a Circuit

Inductive circuits present intriguing challenges in electrical engineering, particularly during the transition from the time domain to the frequency domain. This transformation involves converting inductors into impedances and utilizing phasor representation.
The transfer function is pivotal in characterizing how these circuits react to various frequencies, facilitating a profound understanding of their behavior. An essential parameter is the time constant, signifying the...
Time and frequency -Domain Interpretation of Phase-lead Control01:24

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Phase-lead controllers are commonly used in various control systems to enhance response speed and stability. Adjusting the brightness on a television screen offers a practical example of phase-lead control. When contrast is enhanced, a phase-lead controller is employed. Mathematically, phase-lead control is identified when the first parameter is smaller than the second.
The design of phase-lead control involves the strategic placement of poles and zeros to balance steady-state error and system...
Network Function of a Circuit01:25

Network Function of a Circuit

Frequency response analysis in electrical circuits provides vital insights into a circuit's behavior as the frequency of the input signal changes. The transfer function, a mathematical tool, is instrumental in understanding this behavior. It defines the relationship between phasor output and input and comes in four types: voltage gain, current gain, transfer impedance, and transfer admittance. The critical components of the transfer function are the poles and zeros.
Phase-lead and Phase-lag Controllers01:22

Phase-lead and Phase-lag Controllers

Understanding the working function of different types of controllers can be illustrated with practical analogies, such as adjusting a stereo's volume equalizer. Cranking up the bass involves a phase-lead controller, which functions as a high-pass filter, while increasing the treble uses a phase-lag controller, which acts as a low-pass filter. PD controllers, similar to high-pass filters, enhance the system's response to high-frequency components. PI controllers, akin to low-pass filters, manage...

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Shaping the Amplitude and Phase of Laser Beams by Using a Phase-only Spatial Light Modulator
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A variable-wavelength-based approach of phase retrieval for contrast transfer function based methods.

Yogesh S Kashyap1, Ashish Agrawal, P S Sarkar

  • 1Laser and Neutron Physics Division, Bhabha Atomic Research Centre, Trombay, Mumbai-40085, India. yogesh78@barc.gov.in

Journal of Synchrotron Radiation
|October 27, 2010
PubMed
Summary
This summary is machine-generated.

This study introduces a novel method for X-ray phase-contrast imaging using multiple wavelengths. This approach enhances phase retrieval accuracy for materials with low X-ray absorption, improving imaging sensitivity.

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Area of Science:

  • Medical Imaging
  • Physics

Background:

  • X-ray phase-contrast imaging offers superior sensitivity for low-absorption materials compared to traditional X-ray imaging.
  • In-line phase-contrast imaging is favored for its simplicity and efficient X-ray flux utilization.
  • Existing phase retrieval algorithms often rely on transport of intensity or contrast transfer function methods.

Purpose of the Study:

  • To propose and investigate a novel phase retrieval method for in-line X-ray phase-contrast imaging.
  • To enhance the sensitivity and accuracy of phase retrieval by incorporating multiple wavelengths.
  • To adapt the contrast transfer function formalism for multi-wavelength phase retrieval.

Main Methods:

  • Development of a phase retrieval algorithm based on the contrast transfer function (CTF) formalism.
  • Application of multiple X-ray wavelengths to the in-line phase-contrast imaging setup.
  • Experimental validation and comparison with existing single-wavelength methods.

Main Results:

  • Demonstrated improved phase map reconstruction accuracy using multiple wavelengths.
  • Showcased enhanced sensitivity for materials with low X-ray absorption coefficients.
  • Validated the effectiveness of the CTF-based multi-wavelength approach.

Conclusions:

  • Multi-wavelength phase retrieval using the CTF formalism is a promising advancement in X-ray phase-contrast imaging.
  • This technique offers significant potential for improving the sensitivity and diagnostic capabilities of X-ray imaging.
  • Further research can explore broader applications and optimizations of this multi-wavelength approach.