What is the temporal resolution of Philips Incesive CT?5 answersThe temporal resolution of the Philips Incesive CT scanner is not explicitly mentioned in the provided contexts. However, insights from various studies on different CT scanners can shed light on temporal resolution in CT imaging. For instance, a study on coronary CT angiography with a photon-counting detector CT scanner highlighted the importance of high temporal resolution (66 milliseconds) for superior image quality. Another study on a PET/CT scanner emphasized the benefits of a timing resolution of 325 ps for faster convergence and reduced scan times. Additionally, a study on dynamic cardiac CT imaging achieved high temporal resolution (~33 ms) for evaluating cardiac function. While the exact temporal resolution of the Philips Incesive CT is not directly provided, these findings underscore the significance of high temporal resolution in advanced imaging modalities.
What is the scientific purpose of introducing temporal resolution (or pump-probe scheme) to spectroscopy technique?5 answersThe introduction of temporal resolution, often through pump-probe schemes, in spectroscopy techniques serves the scientific purpose of enabling the study of ultrafast dynamics in various systems. By utilizing pump and probe pulses to trigger and measure dynamics with controlled time delays, researchers can investigate processes such as energy transfer, charge transfer, excited-state dynamics, and polaronic excitations at atomic and molecular levels. This approach allows for the observation of rapid temporal evolution in systems, providing insights into phenomena like electronic couplings, excited-state absorption, and relaxation processes with high time resolution. The temporal information obtained through pump-probe spectroscopy enhances the understanding of fundamental interactions and behaviors in chemistry, biology, and physics.
How temporal focus affect space-time mapping?4 answersTemporal focus has been found to affect space-time mapping. Studies have shown that people's mental conceptualization of past or future as in front or behind is influenced by their temporal focus, which can vary based on cultural attitudes towards time, age, and short-term attention shifts. Additionally, personal experiences such as traumatic events, personally-related events, calendar markers, and real-life experiences can also influence people's space-time mappings. These findings suggest that temporal focus is a significant factor in shaping how individuals implicitly associate past and future with front and back in their mental models of time.
What is SPTR(single photon time resolution)?3 answersSingle Photon Time Resolution (SPTR) refers to the ability to measure the timing of single photons with high accuracy. It is a crucial parameter in applications such as fluorescence lifetime microscopy and photon counting time-of-flight (ToF) 3D imaging. In the context of TCSPC (Time-Correlated Single Photon Counting), the state-of-the-art SPTR is limited to 3-100 ps by single-photon detectors. However, a recent experimental demonstration introduced a time-magnified TCSPC (TM-TCSPC) technique that achieves an ultrashort SPTR of 550 fs using an off-the-shelf single-photon detector. This technique enables the resolution of ultrashort pulses with high accuracy and greatly suppresses range walk error in photon counting ToF 3D imaging systems, providing high depth accuracy and precision.
How does the resolution of TPM compare to that of OCT?4 answersThe resolution of TPM (Terahertz Parametric Generator) is characterized to be 0.2 mm in measurement. On the other hand, OCT (Optical Coherence Tomography) systems can achieve high axial resolution by implementing signal processing techniques such as the Enhanced Lee filter and Richardson-Lucy deconvolution algorithm. Additionally, Quantum OCT (Q-OCT) achieves twice better axial resolution compared to classical OCT systems. Another method to evaluate OCT system resolution is by analyzing point spread functions using suitable phantoms. Furthermore, a combined PAT (Photoacoustic Tomography), ORPAM (Optical Resolution Photoacoustic Microscopy), and OCT instrument has been developed, with lateral spatial resolutions in ORPAM mode of approximately 7μm and 10μm for sub-mm depths. Therefore, the resolution of TPM, OCT, and Q-OCT can vary depending on the specific system and techniques used.
What is the difference between spatial and temporal resolution in neuroimaging methods?5 answersSpatial resolution refers to the ability of a neuroimaging method to accurately distinguish and locate brain activity in different regions of the brain. It is determined by the size of the smallest detectable feature in an image. Temporal resolution, on the other hand, refers to the ability of a neuroimaging method to accurately capture the timing and sequence of brain activity. It is determined by the time interval between successive measurements of brain activity. In functional magnetic resonance imaging (fMRI), spatial resolution is limited by factors such as the size of the blood vessels and the magnetic field strength used, while temporal resolution is limited by the slow hemodynamic response of the brain. Advances in hardware, pulse sequences, and activation paradigms have been made to address these limitations and improve the spatial and temporal resolution of fMRI.