Mr. Tatsuya Maeda Profile

Tatsuya Maeda

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Proceedings Article | 1 April 2024 Poster + Paper

Applicability of high tube voltage imaging to achieve accurate quantitative images when applying photon counting detectors to general radiography

Rina Nishigami, Hiroaki Hayashi, Daiki Kobayashi, Tatsuya Maeda, Takashi Asahara, Yuki Kanazawa, Natsumi Kimoto, Shuichiro Yamamoto

Proceedings Volume 12925, 129252M (2024) https://doi.org/10.1117/12.3004150

KEYWORDS: X-rays, Sensors, Bone, X-ray imaging, X-ray detectors, Monte Carlo methods, Tissues, Radiography, Photon counting

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Energy-resolving photon counting detectors (ERPCDs) used for medical X-ray diagnosis have the potential to extract quantitative information concerning various organs. Previously, we proposed an analysis procedure to determine the effective atomic number (Z_eff), but parameter optimization is required. The purpose of this study is to develop an imaging simulator and to derive optimal imaging conditions. First, we created an imaging simulator taking into consideration the following three elements: (1) X-ray attenuation in objects, (2) detector response of cadmium zinc telluride (CZT), and (3) statistical fluctuation. Second, virtual phantoms consisting of soft tissue (Z_eff=6.5) and bone (Z_eff=13) with mass thicknesses (ρt) of 0.1 to 80g/cm² were made, and the Z_eff images were generated under various imaging conditions related to tube voltages (60 to 120kV) and energy bin settings (10keV intervals). Then, the optimal imaging condition was derived from the accuracy analysis of Z_eff images. Furthermore, a demonstration of clinical quantitative images was performed by using digital phantom which was created from voxel data of the CT image of human body phantom. The optimized imaging conditions were a tube voltage of 120kV with energy bin settings of 20–30–50–120keV. The applicable thickness ranges (achieving differences of +/- 1.0 from theoretical Z_effvalues) for Z_eff=13 and 6.5 were ρt=0.8 to 10g/cm² and 2 to 20g/cm², respectively. Using the above imaging conditions, we succeeded in generating accurate quantitative images of the pelvic region.

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