This Article Figures Only Full Text Full Text (PDF) Alert me when this article is cited Alert me if a correction is posted Services Email this article to a friend Similar articles in this journal Similar articles in PubMed Alert me to new issues of the journal Download to citation manager Citing Articles Citing Articles via HighWire Citing Articles via Google Scholar Google Scholar Articles by Tuinenburg, J. C. Articles by Reiber, J. H. C. Search for Related Content PubMed PubMed Citation Articles by Tuinenburg, J. C. Articles by Reiber, J. H. C.

ARTICLE

American College of Cardiology/ European Society of Cardiology international study of angiographic data compression phase II

The effects of varying JPEG data compression levels on the quantitative assessment of the degree of stenosis in digital coronary angiography

Joan C. Tuinenburg, MSc^*, Gerhard Koning, MSc^*, Ellen Hekking, Aeilko H. Zwinderman, PhD, Tim Becker, MSc, R.üdiger Simon, MD, FACC and Johan H. C. Reiber, PhD^*

^* Division of Image Processing (LKEB), Department of Radiology, LUMC, Leiden, The Netherlands
Heart Core BV, Leiden, The Netherlands
Department of Medical Statistics, LUMC, Leiden, The Netherlands
Medical Clinic, Department of Cardiology, Christian-Albrechts University, Kiel, Germany

Manuscript received June 1, 1999; accepted December 1, 1999.

Reprint requests and correspondence: Prof.dr.ir. Johan H. C. Reiber, Division of Image Processing (LKEB), Department of Radiology, Building 1C2-S, Leiden University Medical Center, PO Box 9600, 2300 RC Leiden, The Netherlands
hreiber{at}lkeb.azl.nl

OBJECTIVES

This report describes whether lossy Joint Photographic Experts Group (JPEG) image compression/decompression has an effect on the quantitative assessment of vessel sizes by state-of-the-art quantitative coronary arteriography (QCA).

BACKGROUND

The Digital Imaging and Communications in Medicine (DICOM) digital exchange standard for angiocardiography prescribes that images must be stored loss free, thereby limiting JPEG compression to a maximum ratio of 2:1. For practical purposes it would be desirable to increase the compression ratio (CR), which would lead to lossy image compression.

METHODS

A series of 48 obstructed coronary segments were compressed/decompressed at CR 1:1 (uncompressed), 6:1, 10:1 and 16:1 and analyzed blindly and in random order using the QCA-CMS analytical software. Similar catheter and vessel start- and end-points were used within each image quartet, respectively. All measurements were repeated after several weeks using newly selected start- and end-points. Three different sub-analyses were carried out: the intra-observer, fixed inter-compression and variable inter-compression analyses, with increasing potential error sources, respectively.

RESULTS

The intra-observer analysis showed significant systematic and random errors in the calibration factor at JPEG CR 10:1. The fixed inter-compression analysis demonstrated systematic errors in the calibration factor and recalculated vessel parameter results at CR 16:1 and for the random errors at CR 10:1 and 16:1. The variable inter-compression analysis presented systematic and random errors in the calibration factor and recalculated parameter results at CR 10:1 and 16:1. Any negative effect at CR 6:1 was found only for the calibration factor of the variable inter-compression analysis, which did not show up in the final vessel measurements.

CONCLUSIONS

Compression ratios of 10:1 and 16:1 affected the QCA results negatively and therefore should not be used in clinical research studies.

Abbreviations and Acronyms   ACC = American College of Cardiology   CD-R = compact disk recordable   CI = confidence interval   CR = compression ratio   CR 6 = compression ratio 6:1   CR 6 vs. 1 (t1 vs. t0) = QCA measurement results at time t1 with compression ratio 6:1 versus QCA measurement results at time t0 with compression ratio 1:1   DICOM = Digital Imaging and COmmunications in Medicine   ESC = European Society of Cardiology   frames/s = frames per second   ICS = International Compression Study   JPEG = Joint Photographic Experts Group   MB = megabytes   QCA = quantitative coronary arteriography   ROI = region of interest

This article has been cited by other articles:

				R.u. Brennecke, U. Burgel, R.u. Simon, G. Rippin, H. P. Fritsch, T. Becker, and S. E. Nissen American College of Cardiology/ European Society of Cardiology international study of angiographic data compression phase III: Measurement of image quality differences at varying levels of data compression J. Am. Coll. Cardiol., April 1, 2000; 35(5): 1388 - 1397. [Abstract] [Full Text] [PDF]