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Congress: ECR25
Poster Number: C-10467
Type: Poster: EPOS Radiographer (scientific)
DOI: 10.26044/ecr2025/C-10467
Authorblock: K. Shiotsuki, S. Makino, H. Ishimoto, Y. Iwao, T. Shiroo, Y. Yoshida, Y. Asayama; Yufu/JP
Disclosures:
Kenshi Shiotsuki: Nothing to disclose
Shuhei Makino: Nothing to disclose
Haruka Ishimoto: Nothing to disclose
Yoshiyuki Iwao: Nothing to disclose
Tomoaki Shiroo: Nothing to disclose
Yukito Yoshida: Nothing to disclose
Yoshiki Asayama: Nothing to disclose
Keywords: Radiation physics, Radiographers, CT, CT-Quantitative, Image manipulation / Reconstruction, Physics, Technical aspects, Technology assessment, Quality assurance
Purpose                Dual-energy computed tomography (DECT) has become a cornerstone of modern radiology, offering unique imaging capabilities not attainable with conventional single-energy CT. However, many DECT systems operating in dual-energy mode cannot directly acquire conventional 120 kVp images [1-3]. Instead, virtual monochromatic images (VMIs) at 70 keV are commonly used as substitutes, providing a practical alternative for clinical diagnostics [4,5].               DECT encompasses various systems, each based on different technological...
Read more Methods and materials DECT acquisition and reconstruction               A 32-cm-diameter water phantom was scanned using second-generation dual-layer detector computed tomography at 100, 120, and 140 kVp. All images were acquired using an 80-mm-wide helical scanning mode with 128 × 0.625 mm collimation. The tube current was adjusted to achieve volume computed tomography dose indices (CTDIvol) of 10 and 20 mGy at each tube voltage. Both small and large focal-spot sizes were employed for each CTDIvol level. Ten scans...
Read more Results                The SDs of VMI at 70 keV at each tube voltage and CTDIvol level for both small and large focal-spot sizes are presented in Figures 2 and 3. For the small focal-spot size, SDs decreased with increasing tube voltage, ranging from 53.4 to 46.6 at 10 mGy and from 38.2 to 33.6 at 20 mGy. A similar trend was observed for the large focal-spot size, with SDs ranging from 38.2 to 34.5 at...
Read more Conclusion                We evaluated the noise magnitude in VMIs at 70 keV reconstructed from three different tube voltages using second-generation dual-layer detector computed tomography. The noise magnitude in the 70 keV VMIs reconstructed from 100 kVp was higher than that in images reconstructed from 120 kVp and 140 kVp, regardless of CTDIvol level, particularly when a small focal spot size was used. Previous studies have shown that differences between DECT systems significantly influence noise magnitude...
Read more References McCollough CH, et al. Dual- and Multi-Energy CT: Principles, Technical Approaches, and Clinical Applications. Radiology. 2015;276(3):637-653. Greffier, Joël, et al. "Spectral CT imaging: technical principles of dual-energy CT and multi-energy photon-counting CT." Diagnostic and Interventional Imaging4 (2023): 167-177. Johnson TR. Dual-Energy CT: General Principles. AJR Am J Roentgenol. 2012;199(5 Suppl):S3-S8. Bhosale P, et al. Quantitative and qualitative comparison of single-source dual-energy computed tomography and 120-kVp computed tomography for the assessment of pancreatic ductal adenocarcinoma. J Comput Assist Tomogr 2015;39(6):907–13. Kojima, Tsukasa, et al. "A novel...
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