Khan Mohammad Siddiqui MD, Presenter: Nothing to Disclose

Eliot Lawrence Siegel MD, Abstract Co-Author: Nothing to Disclose

Bruce Ian Reiner MD, Abstract Co-Author: Nothing to Disclose

Amy Elizabeth Musk MD, Abstract Co-Author: Nothing to Disclose

Jeffrey Johnson PhD, Abstract Co-Author: Nothing to Disclose

Olivier Crave PhD, Abstract Co-Author: Nothing to Disclose

Mariappan S. Nadar PhD, Abstract Co-Author: Nothing to Disclose

et al, Abstract Co-Author: Nothing to Disclose

The JPEG2000 compression standard is increasingly being adopted by industry as a preferred standard method for 2D image compression. With the advent of sub-millimeter multislice scanners, the amount of volumetric data generated can be enormous and can exacerbate the challenges that already exist in image transmission and storage. The purpose of this study was to compare compression efficiency using the 2D JPEG2000 standard to the proposed 3D JPEG2000 (Part 2) standard

For this study five thoracic CT data sets obtained using a 16 detector scanner with a collimation of 0.75mm (kVp 120, mAs 90) were reconstructed at various slice thicknesses (0.75mm, 1.5mm, 3mm, 6mm and 10.0mm). 2D and 3D JPEG2000 (Part 2) compression (4:1, 6:1, 8:1, 12:1, 16:1, 32:1, and 64:1) were applied to these datasets. The effect of compression at mediastinal (350/50) and lung (1500/-600) window and center settings were specifically assessed. Image quality was measured utilizing Peak Signal to Noise Ratio (PSNR) and the Sarnoff JNDmetrixTM Visual Discrimination Model (VDM)

3D JPEG2000 compression yielded consistently higher image quality (i.e., lower JND and higher PSNR values) in most cases when compared to 2D compression at the same ratios. Unlike 2D compression, 3D compression of 0.75 mm slices resulted in an image quality (based on JND levels) that was comparable to that of the 10 mm slices at all compression levels. The reduction in image distortion between the 2D compression technique and 3D compression for 0.75 mm slices at ratios of 8:1 and 16:1 was 0.5 and 1.0 JND, respectively, or 1 to 3 dB in PSNR. Advantage of 3D compression over the current 2D JPEG2000 standard was greater for thinner slices and higher compression ratios

3D JPEG2000 (Part 2) compression has substantial advantages over 2D JPEG2000 compression for all but especially for thinner sub-millimeter CT slice thickness, yielding better quantitative image quality at similar compression ratios. Since the trend in CT equipment development is toward reducing slice thickness, the potential advantages of 3D methods for thin slices are worth noting from this study

J.J.,M.S.N.,O.C.: work for siemens corporate research

Siddiqui, K, Siegel, E, Reiner, B, Musk, A, Johnson, J, Crave, O, Nadar, M, et al, , Improved Image Compression Using 3D JPEG2000 (Part 2): A Comparison with Conventional 2D Compression for Multi-slice CT.  Radiological Society of North America 2004 Scientific Assembly and Annual Meeting, November 28 - December 3, 2004 ,Chicago IL. http://archive.rsna.org/2004/4417610.html