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Updated: Jun 23, 2025

Photoacoustic Cystography
Published on: June 11, 2013
Photon-counting CT: technical features and clinical impact on abdominal imaging
Hiromitsu Onishi1,2, Takahiro Tsuboyama3, Atsushi Nakamoto3
1Department of Radiology, Osaka University Graduate School of Medicine, Suita, Japan. h-onishi@radiol.med.osaka-u.ac.jp.
Abstract:
Photon-counting CT has a completely different detector mechanism than conventional energy-integrating CT. In the photon-counting detector, X-rays are directly converted into electrons and received as electrical signals. Photon-counting CT provides virtual monochromatic images with a high contrast-to-noise ratio for abdominal CT imaging and may improve the ability to visualize small or low-contrast lesions. In addition, photon-counting CT may offer the possibility of reducing radiation dose. This review provides an overview of the actual clinical operation of photon-counting CT and its diagnostic utility in abdominal imaging. We also describe the clinical implications of photon-counting CT including imaging of hepatocellular carcinoma, liver metastases, hepatic steatosis, pancreatic cancer, intraductal mucinous neoplasm of the pancreas, and thrombus.
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