Abstract
Abstract
A rotatable
lutetium-yttrium-oxyorthosilicate-Geiger-mode-avalanche photodiode
(LYSO-GAPD) DEXA detector that can be configured into either a
normal-resolution or a high-resolution mode, was proposed and
examined. A 3 × 3 × 2 mm3 LYSO was coupled to a
3 × 3 mm2 GAPD. The versatile transformation of the
high-resolution mode was possible by employing the rotating
controller for the DEXA detector on its own axis, and the intrinsic
resolution in this mode was improved by ∼ 33% compared to the
normal-resolution mode. Dual-energy X-ray spectra and imaging
capabilities were evaluated in both acquisition modes. The
respective peak positions of low- and high-energy-beam of
normal-resolution mode (high-resolution mode) were 1330 mV
(1262 mV) and 2347 mV (2267 mV). The respective peak-to-valley
ratios of low- and high-energy-beam of normal-resolution mode
(high-resolution mode) were ∼ 2.8 (∼ 2.9) and ∼ 1.2
(∼ 1.1). Considerable improvements in phantom images such as
overall contrast and fine-spot detectability were observed in the
high-resolution mode. It should be noted that spatial resolution was
improved by reducing the detection-area from 3 × 3 mm2
to 2 × 3 mm2 in the high-resolution mode, but count
rate was also decreased. These results demonstrated that a rotatable
LYSO-GAPD DEXA detector allows to provide high versatility for both
high-resolution mode and normal-resolution mode with a single
detector.
Subject
Mathematical Physics,Instrumentation
Cited by
2 articles.
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