2 research outputs found
Cadmium Zinc Telluride (CZT) photon counting detector Characterisation for soft tissue imaging
The use of photon counting detection technology has resulted in significant
X-ray imaging research interest in recent years. Computed Tomography (CT)
scanners can benefit from photon-counting detectors, which are new technology
with the potential to overcome key limitations of conventional CT detectors.
Researchers are still studying the effectiveness and sensitivity of
semiconductor detector materials in photon counting detectors for detecting
soft tissue contrasts. This study aimed to characterize the performance of the
Cadmium Zinc Telluride photon counting detector in identifying various tissues.
An optimal frame rate per second (FPS) of CZT detector was evaluated by setting
the X-ray tube voltage and current at 25 keV, 35 keV and 0.5 mA, 1.0 mA
respectively by keeping the optimum FPS fixed, the detector energy thresholds
were set in small steps from 15 keV to 35 keV and the Currents were set for
X-ray tubes in ranges of 0.1 mA to 1.0 mA to find the relationship between
voltage and current of the X-ray source and counts per second (CPS). The
samples i.e., fat, liver, muscles, paraffin wax, and contrast media were
stacked at six different thickness levels in a stair-step chamber made from
Plexi-glass. X-ray transmission at six different thicknesses of tissue samples
was also examined for five different energy (regions) thresholds (21 keV, 25
keV, 29 keV, 31 keV, and 45 keV) to determine the effect on count per second
(CPS). In this study, 12 frames per second is found to be the optimum frame
rate per second (FPS) based on the spectral response of an X-ray source and CPS
has a linear relationship with X-ray tube current as well. It was also noted
that A sample's thickness also affects its X-ray transmission at different
energy thresholds. A high sensitivity and linearity of the detectors make them
suitable for use in both preclinical and medical applications.Comment: 29 pages and 11 figure