Monte Carlo simulation-based feasibility study of novel indirect flat panel detector system for removing scatter radiation

Abstract

The purpose of this study is to investigate the feasibility of a novel indirect flat panel detector (FPD) system for removing scatter radiation. The substrate layer of our FPD system has a Pb net-like structure that matches the ineffective area and blocks the scatter radiation such that only primary X-rays reach the effective area on a thin-film transistor. To evaluate the performance of the proposed system, we used Monte Carlo simulations to derive the scatter fraction and contrast. The scatter fraction of the proposed system is lower than that of a parallel grid system, and the contrast is superior to that of a system without a grid. If the structure of the proposed FPD system is optimized with respect to the specifications of a specific detector, the purpose of the examination, and the energy range used, the FPD can be useful in diagnostic radiology.

A novel radiation detector for removing scattered radiation in chest radiography: Monte Carlo simulation-based performance evaluation

“…As the simulated number of photons incident on the plane of the detector included the scattered radiation and the primary radiation, it must be divided to derive the scattered and primary radiation rates. On the basis of a previous study [5] that determined the scatter fraction for each system, we estimated the ratio of the primary and scattered photons that were incident on the plane of the detector under the same exposure conditions (figure 8) [18]. Table 4 presents the numbers of total incident photons and primary photons for each system.…”

“…Many studies have aimed to reduce the scattered radiation in indirect FPDs. The proposed indirect FPD was designed based on the conventional indirect FPD and has special structural characteristics, including a net-like lead structure in the substrate layer that matches the ineffective area in the TFT and blocks the scattered radiation [5]. The lead structure motivated an anti-scatter cross-grid used to remove the scattered radiation.…”

“…As part of this effort, the authors of this paper have proposed a novel structure comprising an indirect flat panel detector (FPD) system with a net-like lead structure in the substrate layer, matching the ineffective area on a thin film transistor (TFT) layer to block the scattered radiation so that only the primary X-rays can reach the effective area. The feasibility of the proposed indirect FPD system has been evaluated, and the scattered fraction (SF) and contrast have been calculated in a polymethylmethacrylate (PMMA) phantom [5]. Although its basic properties were identified in a previous study, the novel FPD system must be verified for clinical and practical usage.…”

A new stationary grid, with grid lines aligned to pixel lines with submicron‐order precision, to suppress grid artifacts

“…Since the subject contrasts are determined only by the primary X rays, the scattered radiation not only decreases the subject contrast but also increases quantum noise without contributing to image formation in digital radiography (DR). Various scatter rejection methods have been proposed to improve the quality of the degraded image due to scattered radiation 1–6 . Among these, using an anti‐scatter grid is the most effective and practical method to control the amount of scattering.…”

“…Various scatter rejection methods have been proposed to improve the quality of the degraded image due to scattered radiation. [1][2][3][4][5][6] Among these, using an anti-scatter grid is the most effective and practical method to control the amount of scattering. Software-based scatter correction methods, while generally effective in recovering the damaged image contrast and reducing quantum noise by applying noise filtering, theoretically stop short of perfect contrast recovery or noise elimination.…”