Comparison of the X-ray tube spectrum measurement using BGO, NaI, LYSO, and HPGe detectors in a preclinical mini-CT scanner: Monte Carlo simulation and practical experiment

Lohrabian, Vahid; Kamali-Asl, Alireza; Harvani, Hossein Ghadiri; Aghdam, Seyed Rashid Hosseini; Arabi, Hossein; Zaidi, Habib

doi:10.1016/j.radphyschem.2021.109666

Cited by 9 publications

(1 citation statement)

References 51 publications

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“…An equally effective photon absorber is Bi 4 Ge 3 O 12 (BGO), which further exhibits fewer afterglow emissions. Both materials have been reported as well in CT applications employing medical diagnostics X-ray spectral ranges [18][19][20][21]. Neither of them suffers from hygroscopicity.…”

Section: Introductionmentioning

confidence: 99%

Luminescence Efficiency of Cerium Bromide Single Crystal under X-ray Radiation

et al. 2022

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A rare-earth trihalide scintillator, CeBr3, in 1 cm edge cubic monocrystal form, is examined with regard to its principal luminescence and scintillation properties, as a candidate for radiation imaging applications. This relatively new material exhibits attractive properties, including short decay time, negligible afterglow, high stopping power and emission spectrum compatible with several commercial optical sensors. In a setting typical for X-ray radiology (medical X-ray tube, spectra in the range 50–140 kVp, human chest equivalent filtering), the crystal’s light energy flux, absolute efficiency (AE) and X-ray luminescence efficiency (XLE) were determined. Light energy flux results are superior in comparison to other four materials broadly used in modern medical imaging (slope of the linear no-threshold fit was 29.5). The AE is superior from 90 kVp onwards and reaches a value of 29.5 EU at 140 kVp. The same is true for the XLE that, following a flat response, reaches 9 × 10−3 at 90 kVp. Moreover, the spectral matching factors and the respective effective efficiencies (EE) are calculated for a variety of optical sensors. The material exhibits full compatibility with all the flat-panel arrays and most of the photocathodes and Si PMs considered in this work, a factor that proves its suitability for use in state-of-the-art medical imaging applications, such as CT detectors and planar arrays for projection imaging.

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Section: Introductionmentioning

confidence: 99%

Luminescence Efficiency of Cerium Bromide Single Crystal under X-ray Radiation

et al. 2022

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Calculating off-axis efficiency of coaxial HPGe detectors by Monte Carlo simulation

Omer

Shizuma

Hajima

et al. 2022

Radiation Physics and Chemistry

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Detection performance of pixelated lutetium–yttrium oxyorthosilicate (LYSO) scintillators for high-resolution photon-counting CT imaging

Mahani¹,

Taheri²,

Askari³

2023

Review of Scientific Instruments

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High-resolution photon-counting detector (PCD) computed tomography (CT) imaging is increasingly used for several applications. Recent technological advances in CT instrumentation have introduced various types of radiation detectors. Therefore, this work aims at evaluating the lutetium–yttrium oxyorthosilicate (LYSO) scintillator for use in PCD CT from a detector point of view. To do so, a mini-CT prototype was designed and constructed based on the pixelated LYSO blocks. The detector comprises four 10 × 10 linearly arranged LYSO blocks coupled with four position-sensitive photomultiplier tubes. The prototype utilizes a point gamma-ray source along with a cone-beam collimator. An in-home MATLAB-based data processing software package was also developed for storing the list-mode data, event positioning, and energy windowing. A set of experiments were conducted to assess the performance of the constructed energy-resolved LYSO:Ce detector for mini-CT imaging. The results show good crystal identification for all blocks with a maximum peak-to-valley ratio of 3.48. In addition, the findings confirm that the developed detector is position-sensitive. The 20% energy window provides an optimal performance by simultaneously providing good crystal identification and a scatter removal factor of 0.71. A 96% uniformity was also observed when the detector was irradiated with a uniform flood. The spatial resolution of the mini-CT prototype in the x- and y-directions was calculated to be 0.9 and 0.93 mm, respectively, corrected for a magnification factor of 2.5. It is concluded that the pixelated LYSO crystal is a promising alternative to the current detectors and would be the scintillator of choice for high-resolution PCD CT imaging tasks.

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Comparison of the X-ray tube spectrum measurement using BGO, NaI, LYSO, and HPGe detectors in a preclinical mini-CT scanner: Monte Carlo simulation and practical experiment

Cited by 9 publications

References 51 publications

Luminescence Efficiency of Cerium Bromide Single Crystal under X-ray Radiation

Luminescence Efficiency of Cerium Bromide Single Crystal under X-ray Radiation

Calculating off-axis efficiency of coaxial HPGe detectors by Monte Carlo simulation

Detection performance of pixelated lutetium–yttrium oxyorthosilicate (LYSO) scintillators for high-resolution photon-counting CT imaging

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