Evaluation of imaging performance of major image guidance systems Journal Article
| Authors: | Chan, M. F.; Yang, J.; Song, Y.; Burman, C.; Chan, P.; Li, S. |
| Article Title: | Evaluation of imaging performance of major image guidance systems |
| Abstract: | Purpose: The imaging characteristics of two popular kV cone-beam CT (CBCT) and two MVCT systems utilised in image-guided radiation therapy (IGRT) were evaluated. Materials and methods: The study was performed on Varian Clinac iX, Elekta Synergy S, Siemens Oncor, and Tomotherapy. A CT phantom (Catphan-504, Phantom Laboratory, Salem, NY) was scanned for measurements of image quality including image noise, uniformity, density accuracy, spatial resolution, contrast linearity, and contrast resolution. The measurement results were analysed using in-house image analysis software. Reproducibility, position correction, and geometric accuracy were also evaluated with markers in a smaller alignment phantom. The performance evaluation compared volumetric image properties from these four systems with those from a conventional diagnostic CT (CCT). Results: It was shown that the linearity of the two kV CBCT was fairly consistent with CCT. The Elekta CBCT with half-circle 27-cm FOV had higher CT numbers than the other three systems. The image noises of the Elekta kV CBCT, Siemens MV CBCT, and Tomotherapy fan-beam CT (FBCT) are about 2-4 times higher than that of the Varian CBCT. The spatial resolutions of two kV CBCTs and two MV CBCTs were 8-11 lp/cm and 3-5 lp/cm, respectively. Conclusion: Elekta CBCT provided a faster image reconstruction and low dose per scan for half-circle scanning. Varian CBCT had relatively lower image noise. Tomotherapy FBCT had the best uniformity. © 2011 Biomedical Imaging and Intervention Journal. All rights reserved. |
| Keywords: | controlled study; radiation dose; diagnostic accuracy; reproducibility; signal noise ratio; diagnostic imaging; imaging system; image enhancement; image quality; intermethod comparison; computer assisted radiotherapy; igrt; tomotherapy; image reconstruction; cone beam computed tomography; cone beam ct; mvct; instrument validation |
| Journal Title: | Biomedical Imaging and Intervention Journal |
| Volume: | 7 |
| Issue: | 2 |
| ISSN: | 1823-5530 |
| Publisher: | Biomedical Imaging and Intervention Journal |
| Date Published: | 2011-04-01 |
| Start Page: | e11 |
| Language: | English |
| DOI: | 10.2349/biij.7.2.e11 |
| PROVIDER: | scopus |
| PMCID: | PMC3265149 |
| PUBMED: | 22287985 |
| DOI/URL: | |
| Notes: | --- - "Export Date: 23 June 2011" - "Source: Scopus" |
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