Verbesserte Bildqualität und Nachweisbarkeit von hypovaskularisierten Lebermetastasen im DECT mit angepassten Fensterwerteinstellungen
| Autor: | Axel Wetter, Jens Altenbernd, Thomas C. Lauenstein, Michael Forsting |
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| Jazyk: | angličtina |
| Rok vydání: | 2017 |
| Předmět: |
Male
medicine.medical_specialty Image quality Medizin Sensitivity and Specificity 030218 nuclear medicine & medical imaging Radiography Dual-Energy Scanned Projection 03 medical and health sciences 0302 clinical medicine Multidetector Computed Tomography Multidetector computed tomography Humans Medicine Radiology Nuclear Medicine and imaging Aged Observer Variation Neovascularization Pathologic business.industry Liver Neoplasms Reproducibility of Results Digital Enhanced Cordless Telecommunications Radiographic Image Enhancement 030220 oncology & carcinogenesis Female Radiology Dual energy ct Colorectal Neoplasms business Observer variation Algorithms |
| Popis: | Objective To investigate dual-energy CT of hypovascular liver metastases (LMs) with special focus on window settings (WSs). The aim of the study is to investigate the extent to which adapted WSs and the low-energy images of DECT improve the visibility especially of smaller LMs. Materials and Methods 30 patients with LMs of colorectal cancer were investigated with DECT of the liver. In each patient contrast-enhanced DECT imaging with portal-venous delay was performed. The total number, mean number and conspicuity (1 = excellent – 5 = poor) of LMs were documented on 80-kVp images and virtual 120-kVp images with different WSs (25/200 HU, 50/200, 75/200 HU, 25/350 HU, 50/350 HU, 75/350 HU, 25/500 HU, 50/500 HU, 75/500 HU). The attenuation (HU) of LMs and several anatomic regions and the background noise on 80 kVp images and virtual 120 kVp images were documented. Signal (liver)/noise and liver/LM ratio (SNR/LLMR) were calculated. The total number of LMs depending on size ( 2 cm) on 80 kVp images and virtual 120 kVp images with previously investigated best and regular WSs were documented. Results The highest total number, mean number per patient and total number of LMs Conclusion Low kVp images of DECT datasets are more precise in detecting hypovascular liver metastases than virtual 120 kVp images. Dedicated window settings have a relevant influence on conspicuity. Key points: Citation Format |
| Databáze: | OpenAIRE |
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