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Photon-counting CT vs. energy-integrating detector CT: image quality and radiation dose in multi-phase abdominopelvic
Yu-Fen Huang1, Jian-Feng Yang2, Li Zhao2
1Department of Radiology, Shaoxing Maternity and Child Health Care Hospital, Maternity and Child Health Care Affiliated Hospital, Shaoxing University, 222 Fenglin East Road, Yuecheng District, Shaoxing, Zhejiang, 312000, China.
Objective:
To compare photon-counting detector CT (PCCT) and energy-integrating detector CT (EID-CT) for abdominopelvic imaging regarding radiation dose and image quality.
Methods:
This prospective study enrolled 94 adults undergoing abdominopelvic CT. Objective image quality was assessed by measuring hepatic noise, signal-to-noise ratio (SNR), and contrast-to-noise ratio (CNR). Two blinded radiologists independently scored subjective image quality using a 5-point Likert scale. Radiation exposure was evaluated via CTDIvol, dose-length product (DLP), and scan length-normalized DLP (nDLP).
Results:
PCCT significantly reduced radiation dose: CTDIvol by 57%, DLP by 62%, and nDLP by 57% (all P < .001). Concurrently, image quality improved:hepatic noise decreasing by 31% (P < .001), and SNR increased by 40-70% (P < .001); CNR increased 22-45% (P < .05).
Conclusion:
PCCT achieves substantial radiation dose reduction while improving objective image quality compared with EID-CT in abdominopelvic imaging. These findings support PCCT as a valuable tool for dose-optimised abdominal protocols.
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