Iterative reconstructions in multiphasic CT imaging of the liver: qualitative and task-based analyses of image quality
| Autor: | Edouard Herin, H. Pasquier, Alain Rahmouni, F Zanca, M. Chiaradia, F Gardavaud, Sébastien Mulé, Alain Luciani |
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| Rok vydání: | 2017 |
| Předmět: |
Adult
Male Adolescent Image quality Contrast Media Iterative reconstruction Signal-To-Noise Ratio Imaging phantom 030218 nuclear medicine & medical imaging Liver ct 03 medical and health sciences 0302 clinical medicine Medicine Humans Radiology Nuclear Medicine and imaging In patient business.industry Phantoms Imaging General Medicine Iopamidol Signal-to-noise ratio (imaging) Liver 030220 oncology & carcinogenesis Radiographic Image Interpretation Computer-Assisted Female Tomography Ct imaging Nuclear medicine business Tomography X-Ray Computed Algorithms |
| Zdroj: | Clinical radiology. 73(9) |
| ISSN: | 1365-229X |
| Popis: | Aim To evaluate the clinical benefits on image quality (IQ) of adaptive statistical iterative reconstruction (ASIR) and model-based iterative reconstruction (MBIR) in multiphasic liver CT compared to filtered back-projection (FBP), in patients and on phantoms using a novel task-based metric. Materials and methods Image data of 65 patients who underwent a routine multiphasic liver CT during a 1-month period were reconstructed with FBP, ASIR50, ASIR80, and MBIR. IQ was assessed qualitatively by ranking the most distal hepatic artery (HA) and portal vein (PV) visible; and quantitatively by measuring contrast-to-noise ratio (CNR) of the liver parenchyma, HA and PV. IQ was compared between each reconstruction and correlated to CNR and detectability index (d') measurements computed on phantoms scanned with the same CT protocol as for patients. Results HA and PV were seen more distally on MBIR and ASIR80 compared to FBP (p≤0.001). The CNR correlated weakly between patient and phantom (r=0.76 and 0.80 for HA and PV, respectively), whereas d' correlated strongly with the division order of HA and PV (r=0.96 and 0.95, respectively). Conclusion MBIR and ASIR significantly improve the IQ of multiphasic liver CT, especially through better distal detection of HA and PV, in agreement with the adapted task-based metric d' estimated on phantoms. |
| Databáze: | OpenAIRE |
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