Evaluation of the Effect of Varying MPEG-2 Compression Ratios on Digital Coronary Angiographic Assessment of Stenosis Severity
| Autor: | Hiroshi Inada, Hiroko Kou, Hajime Harauchi, Kuniyuki Hidaka, Kiyonari Inamura, Hiromichi Yokoyama, Yasuhiko Okura, Yasushi Matsumura |
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| Rok vydání: | 2002 |
| Předmět: |
Coronary angiography
medicine.medical_specialty Radiological and Ultrasound Technology business.industry Coronary Disease computer.file_format Coronary Angiography Compression (physics) medicine.disease Article Computer Science Applications Uncompressed video Stenosis Cohen's kappa MPEG-2 Compression ratio Image Processing Computer-Assisted Humans Medicine Radiology Nuclear Medicine and imaging Objective evaluation Radiology business computer Software |
| Zdroj: | Journal of Digital Imaging. 15:210-215 |
| ISSN: | 1618-727X 0897-1889 |
| Popis: | The purpose of this study is to evaluate the influence of MPEG-2 compression scheme on coronary angiography and to search the highest compression ratio at which no significant effect to accuracy of assessment of stenosis severity occurs. Forty-Four digital cine angiographies were used. Three cardiologists participated in a subjective study in which they read both uncompressed images and compressed images. Furthermore, an objective study was carried out to measure vessel stenosis ratio by using software. The influence of compression was evaluated by kappa statistics in case of subjective study and by both systematic error and random error in case of objective study. Kappa statistics between uncompressed image and compressed image at a ratio of 80:1 was significantly lower than that of other compression ratios such as 40:1. Similar results were obtained in objective evaluation. In this report, the authors provide the baseline for further studies on observer performance for motion images. |
| Databáze: | OpenAIRE |
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