“…3(b) shows the knife-edge area, and the MTF obtained is shown in Fig. 3(c) , the spatial frequency corresponding to an MTF of 0.1 34 (MTF10) is equal to 1.12 lp/mm; therefore, the concrete value of the spatial resolution is 1.12 lp/mm, which indicate that the spatial resolution satisfies the requirement of the experiment. Figure 3 ( a ) The spatial resolution shown by the density strip; ( b ) the knife-edge area; ( c ) the MTF of the system.…”
A ZnO:Ga single crystal with an applicable size of φ40 × 1 mm was prepared using the hydro-thermal method. The crystal exhibits good crystallinity and scintillation properties with a 63.94-arcsec full-width at half-maximum (FWHM) in the X-ray rocking curve (XRC) spectrum, 8% luminous non-uniformity, emission at 389 nm in the X-ray excited luminescence spectrum, fast response and 5.5% BGO luminous intensity. Furthermore, an X-ray pinhole imaging system of nanosecond temporal resolution with a ZnO:Ga single-crystal image converter was established to diagnose the cathode electron emission spatial distribution of an intense current diode. Results for shutter times of 4 μs and 5 ns were obtained, which directly represent the cathode electron spatial distribution throughout the entire pulse duration and during a certain moment of the pulse, respectively. The results demonstrate that the large ZnO:Ga single crystal can diagnose the spatial distribution of cathode electron emission in an intense current diode with high temporal resolution and provide new solutions for high-temporal-resolution diagnosis of a pulse radiation field.
“…3(b) shows the knife-edge area, and the MTF obtained is shown in Fig. 3(c) , the spatial frequency corresponding to an MTF of 0.1 34 (MTF10) is equal to 1.12 lp/mm; therefore, the concrete value of the spatial resolution is 1.12 lp/mm, which indicate that the spatial resolution satisfies the requirement of the experiment. Figure 3 ( a ) The spatial resolution shown by the density strip; ( b ) the knife-edge area; ( c ) the MTF of the system.…”
A ZnO:Ga single crystal with an applicable size of φ40 × 1 mm was prepared using the hydro-thermal method. The crystal exhibits good crystallinity and scintillation properties with a 63.94-arcsec full-width at half-maximum (FWHM) in the X-ray rocking curve (XRC) spectrum, 8% luminous non-uniformity, emission at 389 nm in the X-ray excited luminescence spectrum, fast response and 5.5% BGO luminous intensity. Furthermore, an X-ray pinhole imaging system of nanosecond temporal resolution with a ZnO:Ga single-crystal image converter was established to diagnose the cathode electron emission spatial distribution of an intense current diode. Results for shutter times of 4 μs and 5 ns were obtained, which directly represent the cathode electron spatial distribution throughout the entire pulse duration and during a certain moment of the pulse, respectively. The results demonstrate that the large ZnO:Ga single crystal can diagnose the spatial distribution of cathode electron emission in an intense current diode with high temporal resolution and provide new solutions for high-temporal-resolution diagnosis of a pulse radiation field.
“…Rather than a simple spatial resolution limit, the imaging capabilities are fully described across the entire spatial frequency range (usually measured in the line pairs per millimeters, lp/mm). An MTF curve clearly depicts that the finer detail, the lower contrast, highlighting the inter-related nature of resolution and contrast [25,26].…”
Section: Resolution: Definition and Measurementmentioning
confidence: 98%
“…The spatial resolving power of an image-forming system is the ability to separate image of two neighboring objects points. Various statements of the resolution have been given in the literature, including the pixel size of the detector, the thickness of the scintillator, or observability of small holes [24][25][26]. The Modulation Transfer Function (MTF) is a common metric used to quantify the spatial resolution.…”
Section: Resolution: Definition and Measurementmentioning
Neutron imaging and tomography allow observing the structure of large objects (from few to hundred centimeters) at a resolution around 100 μm. This nondestructive method is based on the detection of the transmission of a neutron beam through an object in 2D (imaging) or 3D after rotating the sample (tomography). The components of the object attenuate the neutron beam differently, depending on their composition, and produce accurate pictures of objects which give information about their structure. Neutron imaging has been used for quality control purposes in industries (aircraft, motor engineering...), but also find application from materials sciences (fuel cells, lithium batteries) through earth science (petrology, geology) to cultural heritage. More recently studies have been performed on food science topics.
“…The tomography system's spatial resolution is limited by the pixel sampling rate, the X-ray source size, the source-to-scintillator screen distance, and blurring due to the thickness of the scintillator-screen (Jespers et al, 1976;Samei et al, 2005). In this work the spatial resolution limit is determined through the establishment of the MTF of the system according to the ISO 12233 standard which presents the general methodology for performing MTF measurements based on the slanted-edge method (Kharfi et al, 2012). Fig.…”
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