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OC33.08: What is the best videocompression algorithm for digital fetal ultrasound videoclips?

2005; Wiley; Volume: 26; Issue: 4 Linguagem: Inglês

10.1002/uog.2206

1469-0705

David Watson, I. Kromin, F. Y. Chan, Lazaros Kastanis, A. Lee‐Tannock, Greg Duncombe, Glenn Gardener, Anne Lynn S. Chang,

Prenatal Screening and Diagnostics

To find the best videocompression algorithm for fetal ultrasound videoclips, without compromising clinical image quality. Six 5 second digital videoclips of normal fetal cranial morphology were obtained at 20 weeks gestation. Three clips were then compressed using five compression/decompression algorithms (CODEC): PICVideo™ M-JPEG, PICVideo™ Wavelet2000, Cinepak, MPEG0-1, and DivX5.2. For each CODEC, except Cinepak, four quality settings (1–4) were selected to yield different file sizes. A total of 17 compressed files per videoclip were produced (file size range: 120 Kb to 32 Mb). Five clinicians assessed the quality of the clips using a seven point scale. Analysis of interobserver variability was conducted using Wendall W test for concordance. Comparison of the image quality between the compressed videoclips was performed using Kruskal-Wallis one-way analysis of variance. There was a very close agreement between the observers: concordance was 0.92 (p < 0.0001). As a whole, compression reduces the overall quality of the video clips (p = 0.0004). When image quality using specific CODECs were compared to the uncompressed clip, there were significant reduction in quality for the following clips: DivX (1), DivX (2), Wavelet (1), Wavelet (2), MPEG (1) p = 0.001, MPEG (2) p = 0.01, MPEG (3) p = 0.05. There were four compressed videoclips that scored similar to the uncompressed originals: Cinepak, DivX (4) MJPEG (4) and Wavlet (4). The original uncompressed file size was 194 Mb. File size after compression for these four videoclips were as follows; Cinepak:7.3 Mb, DivX (4):0.4 Mb, MJEG (4): 31.8 Mb, and Wavelet (4): 6.5 Mb. Their respective file sizes as compared to the original were: 3.8%, 0.2%, 16.4% and 3.4%. The best videocompression algorithm for fetal ultrasound videoclip that results in no significant deterioration of clinical image quality, and with the smallest file size is DivX(4), followed by Wavelet (4), Cinepak, and MJEG (4).