What is Z-axis resolution CT?
This study evaluated the Z-axis resolution of these two scanning modes on a 16-slice multi- detector CT (MDCT). Z-axis resolution was defined as the full-width at half maximum (FWHM) of the slice sensitivity profile (SSP). Similar work has been previously published in the literature1.
What is CT resolution?
Current CT scanners have a spatial resolution of 0.5–0.625 mm in the z-axis, and approximately 0.5 mm in the x- to y-axes.
What is CT spatial resolution?
Spatial resolution in CT is the ability to distinguish between object or structures that differ in density. A high spatial resolution is important for one to discriminate between structures that are located within a small proximity to each other.
What is Z flying focal spot?
The z-flying focal spot technique has been implemented in a recently introduced MDCT scanner. Using 32 x 0.6 mm collimation, this scanner acquires 64 overlapping 0.6 mm slices per rotation in its spiral (helical) mode of operation, with the goal of improved longitudinal resolution and reduction of spiral artifacts.
What determines CT resolution?
The spatial resolution in a CT image is determined principally by the size and number of detector elements, the size of the X-ray focal spot, and the source-object-detector distances. In the UTCT ACTIS scanner, the source-to-detector distance and the sizes of the detector elements are fixed.
What is kV CBCT?
Kilo-voltage cone beam computed tomography (kV-CBCT) integrated into the linear accelerator as a tool for image guided radiation therapy, was developed to acquire on-line volumetric and anatomical images [1].
What is HRCT chest for Covid?
HRCT chest is very sensitive and accurate in picking up lung parenchymal abnormalities in laboratory negative RT-PCR cases with high clinical suspicion of COVID-19 infection and also in all symptomatic patients where RT-PCR was not done.
What is the difference between kV and MV?
The imaging dose from kV radiographs and kV-CBCT scans is much less than from conventional MV portal imaging. Using kV imaging rather than MV imaging reduces patient doses and results in higher quality images.
Is CBCT kV or MV?
Summary. MV CBCT can be performed with standard radiotherapy equipment with additional software, whereas KV CBCT requires additional equipment as well. The use of CBCT in 3D positional verification could be particularly useful when detecting out-of-plane rotations.