What is coherence in imaging?
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Coherence in imaging refers to the ability to maintain phase relationships between different parts of a wavefront, enabling high-quality image formation. Various techniques such as optical coherence tomography (OCT) utilize coherence to achieve detailed imaging of biological tissues. Coherence detection methods, like interferometry, play a crucial role in distinguishing between coherent and incoherent light sources for precise imaging. Moreover, coherence gating techniques can enhance imaging resolution beyond the diffraction limit, as demonstrated in quantitative phase imaging (QPI). By exploiting coherence properties and advanced imaging systems, researchers can overcome limitations and achieve super-resolution imaging for applications in biomedicine and clinical environments.
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| Coherence in imaging refers to the ability to spatially co-register successive scans to analyze phase changes, enabling determination of strain or elasticity in the imaged object using optical coherence elastography. | |
2 Citations | Coherence in imaging refers to exploiting intrinsic coherence-gating properties of partially coherent light to achieve super-resolution quantitative phase imaging, as demonstrated in the paper. |
| Coherence in imaging refers to generating stable images by averaging data collected during favorable tissue-detector movement periods, reducing movement noise and averaging out heartbeat effects. | |
| Coherence in imaging refers to utilizing interference patterns to differentiate between coherent and incoherent light sources, aiding in laser detection and wavelength determination using spatial light modulators and cameras. | |
| Coherence in imaging refers to the ability of the optical coherence imaging system to achieve high resolution and large imaging depth, enabling precise preoperative detection and real-time intraoperative imaging. |
Related Questions
How do coherence values influence the accuracy of DEM generation from SAR satellite images?5 answersCoherence values play a crucial role in determining the accuracy of Digital Elevation Model (DEM) generation from Synthetic Aperture Radar (SAR) satellite images. Higher coherence values, typically above 0.5, indicate a stronger correlation between the complex-valued interferometric SAR images, leading to more accurate elevation values resembling those from established DEMs like SRTM. Additionally, coherence is essential in filtering out spatial inconsistencies and residues, which significantly impacts the subsequent unwrapping process for DEM creation. Moreover, coherence thresholds are vital in ensuring reliable InSAR results, with a direct relationship observed between coherence, slope, and error in terrain extraction, guiding the conditions for obtaining precise DEMs from SAR data. These findings collectively highlight the critical influence of coherence values on the accuracy of DEM generation from SAR satellite images.
Is there a paper with result that coherence is lower but effective connectivity higher?5 answersCoherence is generally associated with simple aggregated dynamical behaviors in networked systems, while effective connectivity refers to the strength of the connections between different components of a system. In the context of EEG functional connectivity estimation, it has been observed that coherence is higher in slow frequencies (delta and theta bands) and lower in the alpha band in children with reading disorders (RDs) compared to typically developing children. However, after undergoing neurofeedback (NFB) treatment, the coherence patterns in children with RDs change. Specifically, the coherence diminishes in the delta, theta, and beta bands, but increases in the alpha band, primarily in the theta intrahemispheric coherences of the left hemisphere. This suggests that while coherence decreases in certain frequency bands, effective connectivity, as indicated by changes in the theta intrahemispheric coherences, increases after NFB treatment in children with RDs.
Is cardiac coherence effective?5 answersCardiac coherence has been shown to be effective in various contexts. Studies have demonstrated that cardiac coherence biofeedback training, which involves slowing one's breathing to 0.1 Hz, can improve respiratory sinus arrhythmia efficiency and be an efficient therapy for cardiovascular diseases, asthma, fibromyalgia, and post-traumatic stress. In a pilot study with combat veterans, HRV biofeedback training resulted in significant improvements in cardiac coherence and information processing, indicating the potential benefits of cardiac coherence in attention and affect regulation. Another study found that positive emotional experiences can lead to alterations in heart rate variability, suggesting that cardiac coherence may be beneficial in the treatment of hypertension and reduce the likelihood of sudden death in patients with congestive heart failure and coronary artery disease. Overall, these findings suggest that cardiac coherence can be an effective tool for stress release and therapeutic interventions in various clinical contexts.
What are the elements of a lesson plan that contribute to coherence?5 answersA well-designed lesson plan should include elements that contribute to coherence. These elements include sequencing scientific concepts and activities to develop a main scientific idea, creating an explicit conceptual storyline, and promoting conceptual coherence throughout the lesson. In mathematics lessons, coherence can be achieved through recursively developing sequence scenes, setting learning goals based on the conflict between what students know and what they don't know, and grounding coherent plots in mathematical content knowledge. In the context of mathematics education, curricular coherence is important for deeper understanding, and lesson coherence is a key aspect. However, there is limited understanding of what constitutes coherent lessons and how to measure their degree of coherence. Coherent curriculum materials are essential for building and linking ideas, and different types of coherence, such as content standard, learning goal, intra-unit, and interunit coherence, can be achieved through the use of learning progressions. In science education, a coherent conceptual storyline is crucial for student learning, and teachers can enhance their capacity to develop coherent conceptual storylines through professional development programs.
How does the sense of coherence develop?5 answersThe sense of coherence (SOC) develops throughout the lifespan as a lifelong learning process. It is a global orientation that helps individuals perceive their environment as comprehensible, meaningful, and manageable. The SOC plays a role in coping with stressors and mobilizing resources to manage tension successfully. It helps individuals identify and use generalized and specific resistance resources, which in turn determines their movement on the health ease/dis-ease continuum. The SOC may open individuals to new generalized resistance resources at the beginning of life and facilitate access to these resources later on. Salutogenic interventions can also strengthen the SOC during different phases of the lifespan. Research has shown that the SOC can be "trained" and strengthened throughout life, contributing to the reduction of stress effects and the maintenance of health.
What does gamma coherence tell us about inter?5 answersGamma coherence is a measure of the strength of functional interactions between cortical areas in the gamma frequency band (30-100 Hz) of the electroencephalogram (EEG). It has been implicated in various cognitive processes, including interhemispheric integration, binding of spatially separated neural events, and communication across brain networks. Studies have shown that gamma coherence is higher during tasks that require interhemispheric integration, such as tracking objects between visual hemifields. Additionally, gamma coherence has been found to be involved in inter-regional communication and synchrony across brain networks. In the context of interhemispheric coherence, gamma coherence has been shown to increase between cortical regions during wakefulness and decrease during REM sleep, suggesting a role in functional interactions and neural processing during different behavioral states.