Performance evaluation of CsI screens for X-ray imaging

赵博震,; 秦秀波,; 冯召东,; Zhao, BZ; Qin, Xiubo; Feng, Zhantao; Wei, CF; Chen, Y; Wang, Boyu; Wei, Liting; 魏存峰,; 王宝义,; 魏龙,

doi:10.1088/1674-1137/38/11/116003

Cited by 7 publications

(5 citation statements)

References 20 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…It is observed that as the thickness of scintillation layer increases, the MTF curves decrease accordingly. This correlation is in line with previous results reported byZhao et al[10]. The probable reason is that thicker film means longer transmission distance, and induces greater lateral spreading of scintillation photons, which inevitably leads to worse spatial resolution.…”

supporting

confidence: 92%

See 1 more Smart Citation

Performance assessment of CsI(Tl) screens on various substrates for X-ray imaging

et al. 2015

Self Cite

View full text Add to dashboard Cite

Thallium-doped cesium iodide (CsI(Tl)) screens are widely used in X-ray imaging devices because of the columnar structure of CsI(Tl) layer, but few reports focus on the optical role of the substrate in the screen system. In this paper, four substrates including fused silica (SiO2), silver-film coated SiO2, graphite (C) and fiber optic plate (FOP) are used to fabricate CsI(Tl) screens by thermal evaporation. Their imaging performance is evaluated by relative light output (RLO), modulation transfer function (MTF), normalized noise power spectrum (NNPS) and noise equivalent quanta (NEQ). The results reveal that although CsI(Tl) film on graphite plate yields images with the lowest light output, it presents relatively higher spatial resolution and better signal-to-noise characteristics. However, films on SiO2 plate obtain low MTF but high NNPS curves, whether or not coated with silver film. Furthermore, scintillation screens on FOP have bright images with low NNPS and high NEQ, but have the lowest MTF. By controlling the substrate optical features, CsI(Tl) films can be tailed to suit a given application.

show abstract

supporting

confidence: 92%

“…Submitted to 'Chinese Physics C' Based on IEC 62220-1 standard, the measuring system was setup as described in Ref. [10]. The coupling structure is dependent on the substrates, as shown in Fig.…”

Section: Experimental Methodsmentioning

confidence: 99%

Performance assessment of CsI(Tl) screens on various substrates for X-ray imaging

et al. 2015

Self Cite

View full text Add to dashboard Cite

show abstract

“…In fluoroscopic imaging involving low-energy (40-110 kV) x-rays, the reabsorption effect of scattering and K-fluorescence [21] are key factors resulting in image blur. However, in SPECT imaging utilizing high-energy (>375 keV) gamma rays, the detector response to the scattered photons and K-fluorescence are important factors for increasing the sensitivity, even if they result in image blur [22]. If the data acquisition mode of the flat-panel detector is achievable with the total count in the entire energy region without any threshold of exposure dose level, we can expect the detection efficiency for SPECT imaging to be satisfactory.…”

Section: Discussionmentioning

confidence: 99%

Preliminary study of integrated C-arm CT/SPECT imaging system for online adaptive 3D brachytherapy using Monte Carlo simulation

Lee

Seong

et al. 2023

J. Inst.

View full text Add to dashboard Cite

Recent advancements in high-dose-rate brachytherapy have led to remarkable clinical outcomes. However, these new developments can cause unknown uncertainties with respect to actual dose delivery, which are yet to be clarified. Therefore, an accurate dose verification system is required. Currently, procedures for image-guided adaptive brachytherapy are constrained by the following limitations: (1) patient transportation between the treatment room and CT/MR (computerized tomography/magnetic resonance) imaging room can displace the application position, (2) the physiological and anatomical changes in the patient’s body cannot be observed during the treatment schedule involving 3–10 fraction, and (3) the movement of the radioactive source inside the body is impossible to track. This study proposes a concept of an integrated online imaging system, which is based on integrated CT and single-photon emission computed tomography (SPECT), namely, the C-arm CT/SPECT system—a combination of a C-arm fluoroscopic x-ray imaging system and an attachable parallel-hole collimator over the imaging detector. The Geant4 software is used to simulate the application of the C-arm CT/SPECT system for 192Ir-based brachytherapy in a pelvis-like phantom. To improve the image quality of C-arm CT/SPECT acquired with limited-angle information, we utilized an adaptive-steepest-descent-projection-onto-convex-sets framework that incorporates additional prior information for the proposed system. Furthermore, we confirmed that SPECT images can be obtained using a parallel-hole collimator and estimated the dose distribution in the medium and CT/SPECT fusion imaging during treatment. This strategy is expected to be effectively implemented in online image-guided adaptive brachytherapy and patient-dose verification.

show abstract

“…5c ). This spatial resolution surpassed that of most previously reported halide perovskite-based X-ray imaging systems 37 (typically lower than 10 LP mm −1 ) and even outperformed a commercial CsI (Tl) scintillator 38 (≈10 LP mm −1 ). Distinct from the traditional real-time X-ray imaging methods, the lanthanide-doped fluoride nanoscintillators with strong XEPL can be used for delayed 3D imaging.…”

Section: Resultsmentioning

confidence: 75%

Dual heterogeneous interfaces enhance X-ray excited persistent luminescence for low-dose 3D imaging

Lei,

Yi,

Wang

et al. 2024

Nat Commun

View full text Add to dashboard Cite

Lanthanide-doped fluoride nanoparticles (NPs) showcase adjustable X-ray-excited persistent luminescence (XEPL), holding significant promise for applications in three-dimensional (3D) imaging through the creation of flexible X-ray detectors. However, a dangerous high X-ray irradiation dose rate and complicated heating procedure are required to generate efficient XEPL for high-resolution 3D imaging, which is attributed to a lack of strategies to significantly enhance the XEPL intensity. Here we report that the XEPL intensity of a series of lanthanide activators (Dy, Pr, Er, Tm, Gd, Tb) is greatly improved by constructing dual heterogeneous interfaces in a double-shell nanostructure. Mechanistic studies indicate that the employed core@shell@shell structure could not only passivate the surface quenchers to lower the non-radiative relaxation possibility, but also reduce the interfacial Frenkel defect formation energy leading to increase the trap concentration. By employing a NPs containing flexible film as the scintillation screen, the inside 3D electrical structure of a watch was clearly achieved based on the delayed XEPL imaging and 3D reconstruction procedure. We foresee that these findings will promote the development of advanced X-ray activated persistent fluoride NPs and offer opportunities for safer and more efficient X-ray imaging techniques in a number of scientific and practical areas.

show abstract

Performance evaluation of CsI screens for X-ray imaging

Cited by 7 publications

References 20 publications

Performance assessment of CsI(Tl) screens on various substrates for X-ray imaging

Performance assessment of CsI(Tl) screens on various substrates for X-ray imaging

Preliminary study of integrated C-arm CT/SPECT imaging system for online adaptive 3D brachytherapy using Monte Carlo simulation

Dual heterogeneous interfaces enhance X-ray excited persistent luminescence for low-dose 3D imaging

Contact Info

Product

Resources

About