The Effect of the Virtual Monochromatic Spectral Imaging for the Metallic Artifact and the Pulmonary Nodule Detection
| Autor: | Ayano Kikuyama, Osamu Honda, Yutaka Kawata, Mitsuhiro Koyama, Masahiro Yanagawa, Hiromitsu Sumikawa, Noriyuki Tomiyama, Tomoko Gyobu, Hiromu Miki |
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| Rok vydání: | 2013 |
| Předmět: |
medicine.medical_specialty
Radiography Sensitivity and Specificity Imaging phantom Radiography Dual-Energy Scanned Projection Metal Artifact medicine Radiology Nuclear Medicine and imaging Artifact (error) Phantoms Imaging business.industry Reproducibility of Results Nodule (medicine) Prostheses and Implants equipment and supplies Spectral imaging Radiographic Image Enhancement Metals Radiography Thoracic Monochromatic color Tomography medicine.symptom Artifacts Tomography X-Ray Computed business Nuclear medicine |
| Zdroj: | Journal of Computer Assisted Tomography. 37:707-711 |
| ISSN: | 0363-8715 |
| DOI: | 10.1097/rct.0b013e31829e0164 |
| Popis: | OBJECTIVES This study aimed to evaluate whether dual-energy computed tomography can reduce metal artifacts and improve detection of pulmonary nodules. METHODS Twelve simulated nodules were randomly placed inside a chest phantom with a pacemaker. Then, dual-energy computed tomography was performed, and 5 virtual monochromatic images at 40, 50, 65, 100, and 140 keV were reconstructed with 5- and 0.625-mm slice thicknesses. Two independent observers assessed the metal artifact (3-point scale from 1, none, to 3, severe) and detection of the nodule (5-point scale from 1, definitely absent, to 5, definitely present). Statistical analysis was performed with a P value of less than 0.01 (0.05/5). RESULTS With both slice thicknesses, the metallic artifact increased at 40 or 50 keV and decreased at 100 or 140 keV relative to that at 65 keV (P < 0.01). The nodule detection score was not significantly different between each kiloelectron volt level with the 0.625-mm slice thickness; however, the score was significantly worse at 40 keV compared to 65 keV (P < 0.01) with the 5-mm slice thickness. CONCLUSIONS High monochromatic energy images can reduce metal artifacts without a change in nodule detection score. Low monochromatic energy images increase metal artifacts and worsen nodule detection in thick slices. |
| Databáze: | OpenAIRE |
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